真菌Pleosporales sp.中的萘醌和羧酸类衍生物

运用Sephadex LH-20凝胶柱色谱、硅胶柱色谱、反相HPLC、手性色谱等多种色谱方法,从真菌Pleosporales sp.大米发酵物的乙酸乙酯提取物中分离得到3个新化合物,包括1个萘醌类化合物、1个萘醌还原型的萘酮类化合物和1个三羧酸类化合物,以及5个已知的萘酮类衍生物。利用质谱、核磁共振、比旋光等多种波谱学方法,以及计算ECD的方法,确定了这8个化合物的结构。新化合物分别命名为pleospathone A (1)、pleospathone B(2)和pleosporalic acid A (3)。已知化合物分别鉴定为(3S,4R)-3,4,8-trihydroxy-6-methyl-3,4-dihydronaphthalen-1(2H)-one (4)、(4R)-3,4-dihydro-4,6,8-trihydroxy-1(2H)-naphthalenone (5)、(-)-scytalone (6)、(3S,4S)-3,4-dihydro-3,4,6,8-tetrahydroxy-1(2H)-naphthalenone (7)和cis-4-hydroxyscytalone (8)。其中,化合物4~8均为首次从Pleosporales属真菌中分离得到。化合物1对人宫颈癌细胞He La和小鼠白血病细胞P388有弱的细胞毒活性,IC_(50)值分别为78.93和98.80μmol·L^(-1)。

1株渤海来源真菌Pleosporales sp.中azaphilones类化合物及其生物活性

目的对1株渤海来源真菌Pleosporales sp.中azaphilones类化合物进行分离鉴定,并评价其生物活性。方法利用硅胶柱层析和高效液相色谱等分离手段对化合物进行分离和纯化;运用NMR和MS等现代波谱方法,并结合相关文献,对化合物的结构进行鉴定;运用抗真菌活性模型对化合物的生物活性进行评价。结果从该真菌中分离获得了6个azaphilones类化合物,分别为：isochromophilone I,VI,IX（1～3）,（＋）-sclerotiorin（4）,5-chloroisorotiorin（5）和hypocrellone A（6）。化合物1～6对3株农业致病真菌Thielaviopsis paradoxa,Pestalotia calabae,和Glorosprium musarum均显示出中等强度的抑制活性。结论化合物1～6均为首次从Pleosporales属真菌中分离得到,具有作为抗农业致病真菌药的研究价值。

Pleosporales

One hundred and five generic types of Pleosporales are described and illustrated.A brief introduction and detailed history with short notes on morphology,molecular phylogeny as well as a general conclusion of each genus are provided.For those genera where the type or a representative specimen is unavailable,a brief note is given.Altogether 174 genera of Pleosporales are treated.Phaeotrichaceae as well as Kriegeriella,Zeuctomorpha and Muroia are excluded from Pleosporales.Based on the multigene phylogenetic analysis,the suborder Massarineae is emended to accommodate five families,viz.Lentitheciaceae,Massarinaceae,Montagnulaceae,Morosphaeriaceae and Trematosphaeriaceae.

Taxonomic circumscription and phylogenetics of novel didymellaceous taxa with brown muriform spores

Sexual morph of didymellaceous taxa are characterized by their ascomata with relatively thin peridium,cylindric-clavate to clavate,short-pedicellate or apedicellate asci,hyaline to brown,1-septate to muriform ascospores.Its asexual morphs are coelomycetous and comprising pycnidial or acervulus conidiomata,phialidic,hyaline conidiogenous cells and hyaline or pale brown,septate or aseptate conidia.The majority of these cosmopolitan species are plant associated fungi which can be pathogens on a wide range of hosts and some species are of particular relevance for quarantine measures.Recent studies have significantly improved the taxonomy and systematics of didymellaceous taxa based on molecular phylogenetics.In contrast to the accurate and detailed studies on the asexual morphs which are common obligate pathogens,information on their usually saprobic sexual morphs is still limited.Among these phenotypically diverse species,spore characteristics are quite unique as most have hyaline spores with 0-1 septum,while only Neomicrosphaeropsis and Didymellocamarosporium are reported as producing pigmented,muriform spores.These dematiaceous muriform spores are characteristic of a considerable number of species that may be quite divergent in other characters.During taxonomic investigations on the diversity of didymellaceous taxa,we have isolated species from Alhagi pseudalhagi,Coronilla emerus,Cytisus sp.,Elaeagnus angustifolia and Spartium junceum in Italy,Russia and Uzbekistan.A comprehensive phylogeny,based on four loci(ITS,LSU,rpb2 and tub2)is used to infer species relationships.Comprehensive morphological descriptions and in-depth phylogenetic investigations of five new species viz.Ascochyta coronillae-emeri,Microsphaeropsis spartii-juncei,Neomicrosphaeropsis alhagi-pseudalhagi,N.cytisicola and N.elaeagni are presented.

New host and geographic records of five pleosporalean hyphomycetes associated with Musa spp.(Banana)

A study was undertaken to collect and identify saprobic fungi associated with Musa spp.(banana)from Taiwan(China),and Thailand.Samples were collected during the dry season and their morpho-molecular relationships were investigated.Five brown pleosporalean hyphomycetous taxa in Periconiaceae and Torulaceae viz.Periconia cortaderiae,P.delonicis,Torula chromolaenae,T.fici,and T.masonii were identified for the first time from Musa spp.(Musaceae).Phylogenetic analyses of a combined SSU,LSU,ITS,RPB2 and TEF DNA sequence dataset further justified the taxonomic placements of these five taxa in the above mentioned families.Periconia delonicis is reported for the first time on a monocotyledonous host and T.masonii is the first geographical record from Taiwan(China).

Saprobic Dothideomycetes in Thailand:Muritestudina gen.et sp.nov.(Testudinaceae)a new terrestrial pleosporalean ascomycete,with hyaline and muriform ascospores

The family Testudinaceae and its intergeneric classification are poorly understood.This is due to overlap of morphological characteristics in genera and lack of DNA sequence data to infer phylogenetic relationships.The main objective of the present paper is to establish a novel genus,Muritestudina,based on distinct morphological characteristics and analyses of combined LSU,SSU,ITS,rpb2 and tef1 sequence data.We also fill the gap of our current knowledge on the phylogenetic position of Testudinaceae.Based on the morphological characteristics of species representing existing genera of Testudinaceae,we herein introduce a new genus,Muritestudina with M.chiangraiensis as the type species.The new genus is characterized by globose to subglobose,ostiolate ascomata;a peridium of brown to dark-brown cells of textura angularis;septate and cellular pseudoparaphyses;cylindric-clavate asci with a distinct pedicel;and hyaline,ellipsoidal and muriform ascospores.The new genus differs from the other genera in Testudinaceae in having hyaline,muriform ascospores.Combined analyses of ribosomal and protein coding gene sequence data confirmed that our new taxon belongs in Testudinaceae with a close relationship with Neotestudina rosatii.

Identification and evaluation of enzymatic ability of fungal endophytes from Citrofortunella microcarpa(Bunge)Wijnands

Citrofortunella microcarpa locally known as“kalamansi”belongs to the family Rutaceae is one of the most important marketable fruit crops grown in the Philippines.Aside from being a fruit crop,the plant also houses various endophytic microorganisms which exhibit various symbiotic relationships.Thus,this study isolated fungal endophytes from C.microcarpa stem and leaves and were identified culturally and morphologically.The identities of the fungal species were confirmed using ITS1 and ITS4 sequences.The identified fungal endophytes were tested for their ability to produce fungal enzymes such as amylase,cellulase,laccase and protease.Totally 11 fungal endophytes were isolated from stem and leaves of C.microcarpa namely,Colletotrichum fructicola,Colletorichum gloeosporioides,Colletotrichum siamense,Fusarium oxysporum,Lasiodiplodia theobromae,Nigrospora oryzae,Nigrospora rubi,Nodulisporium indicum,Phomopsis azadirachtae,Phyllosticta capitalensis,and an unidentified species under the Order Pleosporales.All the identified endophytic fungal species showed production of amylase.For the cellulose assay,four species namely L.theobromae,N.oryzae,C.gloeosporioides,and the unidentified species had potential for cellulose degradation.Fusarium oxysporum and P.azadirachtae were found to be producers of laccase.Meanwhile,only the unidentified species showed extracellular protease activity.

Camarosporium uniseriatum nom.nov.,from Celtis occidentalis in European Russia

Celtis occidentalis(American hackberry)is a deciduous tree widely distributed in northern America and introduced in many regions of Europe.In this study we collected Cucurbitaria celtidis from dead or dying twigs and branches of C.occidentalis(Cannabaceae)in the Rostov region(Southern European Russia),where this tree is a common ergasiophyte in artificial forests.The placement of this species in Camarosporium sensu stricto in Pleosporinae,Pleosporales is shown in a multi-locus tree based on combined LSU,SSU and ITS sequence data.Camarosporium uniseriatum nom.nov.is introduced based on morphological and phylogenetic analyses.

Ranking higher taxa using divergence times:a case study in Dothideomycetes

The current classification system for the recognition of taxonomic ranks among fungi,especially at highranking level,is subjective.With the development of molecular approaches and the availability of fossil calibration data,the use of divergence times as a universally standardized criterion for ranking taxa has now become possible.We can therefore date the origin of Ascomycota lineages by using molecular clock methods and establish the divergence times for the orders and families of Dothideomycetes.We chose Dothideomycetes,the largest class of the phylum Ascomycota,which contains 32 orders,to establish ages at which points orders have split;and Pleosporales,the largest order of Dothideomycetes with 55 families,to establish family divergence times.We have assembled a multi-gene data set(LSU,SSU,TEF1 and RPB2)from 391 taxa representing most family groups of Dothideomycetes and utilized fossil calibration points solely from within the ascomycetes and a Bayesian approach to establish divergence times of Dothideomycetes lineages.Two separated datasets were analysed:(i)272 taxa representing 32 orders of Dothideomycetes were included for the order level analysis,and(ii)191 taxa representing 55 families of Pleosporales were included for the family level analysis.Our results indicate that divergence times(crown age)for most orders(20 out of 32,or 63%)are between 100 and 220 Mya,while divergence times for most families(39 out of 55,or 71%)are between 20 and 100 Mya.We believe that divergence times can provide additional evidence to support establishment of higher level taxa,such as families,orders and classes.Taking advantage of this added approach,we can strive towards establishing a standardized taxonomic system both within and outside Fungi.In this study we found that molecular dating coupled with phylogenetic inferences provides no support for the taxonomic status of two currently recognized orders,namely Bezerromycetales and Wiesneriomycetales and these are treated as synonyms of Tubeufiales while Asterotexiales is treated as a synonym of Asterinales.In addition,we provide an updated phylogenetic assessment of Dothideomycetes previously published as the Families of Dothideomycetes in 2013 with a further ten orders and 35 families.

Bambusicolous fungi

Fourty-three species of microfungi from bamboo are treated,including one new family,Occultibambusaceae,three new genera,Neoanthostomella,Occultibambusa and Seriascoma,27 new species,one renamed species and 15 redescribed or re-illustrated species,and four designated reference specimens are treated in this paper,the majority of which are saprobic on dead culms.To determine species identification,separate phylogenetical analyses for each group are carried out,based on molecular data from this study and sequences downloaded from GenBank.Morphologically similar species and phylogenetically close taxa are compared and discussed.In addition a list of bambusicolous fungi published since Hyde and colleagues in 2002 is provided.

A polyphasic approach to delineate species in Bipolaris

Bipolaris species are important plant pathogens with a worldwide distribution in tropical and temperate environments.Species recognition in Bipolaris has been problematic due to a lack of molecular data from ex-type cultures,the use of few gene regions for species resolution and overlapping morphological characters.In this study,we evaluate the efficiency of different DNA barcodes in species delimitation in Bipolaris by phylogenetic analyses,Automatic Barcode Gap Discovery and Objective Clustering.GAPDH is determined to be the best single marker for the genus.These approaches are used to clarify the taxonomic placement of all sequences currently named as Bipolaris in GenBank based on ITS and GAPDH gene sequence data.In checking various publications,we found that the majority of new host records of fungal species published in the Plant Disease journal from 2010 to 2019 were based on BLAST searches of the ITS sequences and up to 82%of those records could be erroneous.Therefore,relying on BLAST searches from GenBank to name species is not recommended.Editorial boards of journals and reviewers of new record papers should be aware of this problem.In naming Bipolaris species,whether new or known,it is recommended to perform phylogenetic analyses based on GAPDH using the correct taxon sampling for accurate results and the species relationship should have reliable statistical support.At least two new species are represented by molecular data in GenBank and we provide an updated taxonomic revision of Bipolaris.We accept 45 species in Bipolaris and notes are provided for all the species including hosts and geographic distribution.

Towards a natural classification and backbone tree for Lophiostomataceae,Floricolaceae,and Amorosiaceae fam.nov.

The genera Lophiostoma,Misturatosphaeria and several other allied taxa in Lophiostomataceae are revisited.Accounts of these taxa,including their history,morphology,and family placement,based on molecular phylogeny,are provided.Type or representative specimens of Lophiostoma and Misturatosphaeria were examined and fresh specimens were obtained from Germany,Italy,Japan and Thailand.A multi-gene phylogenetic analysis of the lophiostomataceous genera Floricola,Lophiostoma,Misturatosphaeria and related taxa is provided.Sixteen genera including Lophiostoma,Lophiohelichrysum,Dimorphiopsis,Platystomum and Vaginatispora,plus eleven newly introduced genera Biappendiculispora,Alpestrisphaeria,Capulatispora,Coelodictyosporium,Guttulispora,Lophiopoacea,Neotrematosphaeria,Paucispora,Pseudolophiostoma,Pseudoplatystomum and Sigarispora are accepted in Lophiostomataceae based on morphology and phylogeny.Lophiostoma caulium,Lophiostoma arundinis and Lophiostoma caudatum are accommodated in Sigarispora.Lophiostoma winteri and Lophiostoma fuckelii are placed in the genera Lophiopoacea and Vaginatispora respectively.Three Curreya species and Misturatosphaeria claviformis are transferred to a new genus,Neocurreya.All other Misturatosphaeria species except Misturatosphaeria aurantiinotata and M.uniseptata are separated in the new genera Asymmetrispora,Aurantiascoma,Magnibotryascoma,Pseudoaurantiascoma and Pseudomisturatosphaeria based on their morphological and phylogenetic affinities.Another new genus,Ramusculicola is introduced for a new collection from Thailand.These seven new genera are accommodated in a new family Floricolaceae,together with Floricola and Misturatosphaeria.Several massarina-like species clustered as a sister clade to Amorosia littoralis and are accommodated in a new genus Angustimassarina.A new family Amorosiaceae is proposed to accommodate the genera Amorosia and Angustimassarina.The putatively named species Decaisnella formosa and Thyridaria macrostomoides form a separate clade together with a new genus Lignosphaeria which is placed in Dothideomycetes,genera incertae sedis.

Towards a natural classification of Astrosphaeriella-like species;introducing Astrosphaeriellaceae and Pseudoastrosphaeriellaceae fam.nov.and Astrosphaeriellopsis,gen.nov.

Astrosphaeriella sensu lato is a common genus occurring on bamboo,palms and stout grasses.Species of Astrosphaeriella have been collected from various countries in tropical,subtropical or temperate regions.In Asia,species have been collected in Brunei,China,Indonesia,Japan,Philippines and Vietnam.There have been several morphological studies on Astrosphaeriella,but molecular work and phylogenetic analyses are generally lacking.Taxa included in Astrosphaeriella were characterized in three main groups 1)typical Astrosphaeriella species(sensu stricto)having carbonaceous,erumpent,conical ascostromata 2)atypical Astrosphaeriella species(sensu lato)having immersed,coriaceous ascostromata with short to long papilla and 3)lophiostoma-like species having immersed ascostromata with slit-like openings.Some of the latter Astrosphaeriella species,having slit-like openings,have been transferred to Fissuroma and Rimora in Aigialaceae.In this study five type specimens of Astrosphaeriella were loaned from herbaria worldwide and re-examined and are re-described and illustrated.Collections of Astrosphaeriella were also made in Thailand and morphologically examined.Pure cultures were obtained from single spores and used in molecular studies.The asexual morph was induced on sterile bamboo pieces placed on water agar.Phylogenetic analyses of combined LSU,SSU and TEF1 sequence data of astrosphaeriella-like species using Bayesian,Maximum parsimony(MP)and Randomized Accelerated Maximum Likelihood(RAxML)analyses were carried out.Phylogenetic analyses show that species of Astrosphaeriella can be distinguished in at least three families.Species of Astrosphaeriella sensu stricto with erumpent,carbonaceous ascostromata,form a strongly supported clade with Pteridiospora species and a new family,Astrosphaeriellaceae,is introduced to accommodate these taxa.The genera are revised and Astrosphaeriella bambusae,A.neofusispora,A.neostellata,A.thailandica,A.thysanolaenae and Pteridiospora chiangraiensis are introduced as new species.Astrosphaeriella exorrhiza is reported on a dead stem of Thysanolaena maxima and is the first record for Thailand.Reference specimens for A.fusispora and A.tornata are designated to stabilize the taxonomy of Astrosphaeriella.The coelomycetous asexual morph of A.bambusae is reported and forms hyaline,globose to subglobose,aseptate conidia.Species of Astrosphaeriella sensu lato with immersed,coriaceous ascostromata,with short to long papilla and striate ascospores,form a sister clade with Tetraplosphaeriaceae.The genus Pseudoastrosphaeriella is introduced to accommodate some of these taxa with three new species and three new combinations,viz.P.aequatoriensis,P.africana,P.bambusae,P.longicolla,P.papillata and P.thailandensis.A new family Pseudoastrosphaeriellaceae is introduced to accommodate this presently monotypic lineage comprising Pseudoastrosphaeriella.The asexual morph of P.thailandensis is described.Astrosphaeriella bakeriana forms a distinct clade basal to Aigialaceae.Astrosphaeriella bakeriana is excluded from Astrosphaeriella and a new genus Astrosphaeriellopsis,placed in Dothideomycetes genera incertae sedis,is introduced to accommodate this taxon.Fissuroma aggregata(Aigialaceae)is re-visited and is shown to be a cryptic species.Three new species of Fissuroma and a new combination are introduced based on morphology and phylogeny viz.F.bambusae,F.fissuristoma,F.neoaggregata and F.thailandicum.The asexual morph of Fissuroma bambusae is also reported.

Families of Dothideomycetes

Dothideomycetes comprise a highly diverse range of fungi characterized mainly by asci with two wall layers(bitunicate asci)and often with fissitunicate dehiscence.Many species are saprobes,with many asexual states comprising important plant pathogens.They are also endophytes,epiphytes,fungicolous,lichenized,or lichenicolous fungi.They occur in terrestrial,freshwater and marine habitats in almost every part of the world.We accept 105 families in Dothideomycetes with the new families Anteagloniaceae,Bambusicolaceae,Biatriosporaceae,Lichenoconiaceae,Muyocopronaceae,Paranectriellaceae,Roussoellaceae,Salsugineaceae,Seynesiopeltidaceae and Thyridariaceae introduced in this paper.Each family is provided with a description and notes,including asexual and asexual states,and if more than one genus is included,the type genus is also characterized.Each family is provided with at least one figure-plate,usually illustrating the type genus,a list of accepted genera,including asexual genera,and a key to these genera.A phylogenetic tree based on four gene combined analysis add support for 64 of the families and 22 orders,including the novel orders,Dyfrolomycetales,Lichenoconiales,Lichenotheliales,Monoblastiales,Natipusillales,Phaeotrichales and Strigulales.The paper is expected to provide a working document on Dothideomycetes which can be modified as new data comes to light.It is hoped that by illustrating types we provide stimulation and interest so that more work is carried out in this remarkable group of fungi.

Microfungi on Tamarix

Tamarix species are small trees that grow in various natural habitats and have a wide geographic distribution.Microfungal species previously found on Tamarix and recently collected in Italy and Russia were identified based on morphological characters and analyses of gene sequence data.The sexual morph of the coelomycetous genus Homortomyces was collected for the first time and is described and illustrated.A new family,Homortomycetaceae(Dothideomycetes,families incertae sedis)is introduced to accommodate Homortomyces.Two new genera Neomicrosphaeropsis(Didymellaceae)and Tamaricicola(Pleosporaceae)are introduced in this paper.Phoma tamaricicola was recollected and is placed in Neomicrosphaeropsis based on morphology and molecular data.Ten new species,Cytospora italica,C.unilocularis,Diaporthe ravennica,Eutypella tamaricis,Neomicrosphaeropsis italica,N.novorossica,N.rossica,Keissleriella tamaricicola,Paracamarosporium tamaricis and Tamaricicola muriformis are introduced,while Alternaria tenuissima,Dothiorella sarmentorum,Neofusicoccum luteum,Paraepicoccum amazonense,Pleospora herbarum and Pseudocamarosporium propinquum are reported for the first time on Tamarix spp.with descriptions and illustrations.Multi-gene analyses show that Paraepicoccum amazonense should be placed in Pleosporineae,Pleosporales,where it is closely related to Camarosporium sensu stricto.Several herbarium specimens were studied to illustrate other fungal species recorded on Tamarix species.A comprehensive account of microfungi on Tamarix is provided,which includes a list with data from the literature,as well as those identified in the present study.The taxonomic placement of most taxa discussed in this study is based on a modern taxonomic framework based on analysis of multi-gene sequence data.

Revision of Phaeosphaeriaceae

Phaeosphaeriaceae is a large and important family in the order Pleosporales which includes economically important plant pathogens.Species may also be endophytes or saprobes on plant hosts,especially on monocotyledons(e.g.,Cannaceae,Cyperaceae,Juncaceae,Poaceae);some species have also been reported on dicotyledons.The family previously accommodated 35 sexual and asexual genera and comprised more than 300 species with a range of morphological characters.The morphological characters of taxa in this family are often ambiguous and can be confused with other taxa in Leptosphaeriaceae and Montagnulaceae.Fourteen specimens of the type genera of Phaeosphaeriaceae were loaned from herbaria worldwide and were re-examined and illustrated.Fresh collections were obtained from Italy and Thailand,characterized,examined,isolated into pure culture and used to obtain molecular data.The asexual state was induced where possible on sterile bamboo pieces placed on water agar.Multigene phylogenetic analyses of ITS,LSU,SSU,RPB2 and TEF1 sequence datasets were carried out using maximum likelihood,maximum parsimony and Bayesian analysis.Molecular analyses shows that 21 genera(Amarenomyces,Ampelomyces,Chaetosphaeronema,Dematiopleospora,Entodesmium,Loratospora,Neosetophoma,Neostagonospora,Nodulosphaeria,Ophiobolus,Ophiosphaerella,Paraphoma,Parastagonospora,Phaeosphaeria,Phaeosphaeriopsis,Sclerostagonospora,Setomelanomma,Setophoma,Vrystaatia,Wojnowicia and Xenoseptoria)belong in Phaeosphaeriaceae,while seven genera(Amarenographium,Bricookea,Dothideopsella,Eudarluca,Phaeostagonospora,Scolecosporiella and Tiarospora)are included based on morphological data.Amarenomyces is reinstated and Nodulosphaeria is confirmed in Phaeosphaeriaceae.Eudarluca is distinguished from Sphaerellopsis based on its morphological characters and is typical of Phaeosphaeriaceae.ITS gene phylogenetic analys is indicates that Sphaerellopsis belongs to Leptosphaeriaceae.Ophiobolus species form a clade within Phaeosphaeriaceae while Ophiosphaerella is shown to be polyphyletic.Phaeosphaeria sensu stricto is redefined.Two new species of Phaeosphaeria and one of Phaeosphaeriopsis are introduced while the asexual states of Phaeosphaeria chiangraina and Phaeosphaeriopsis dracaenicola are reported.Scolicosporium minkeviciusii forms a sister clade with Neostagonospora and Parastagonospora in Phaeosphaeriaceae.However,Scolicosporium minkeviciusii is not the type species.Thus,the placement of Scolicosporium sensu stricto in Phaeosphaeriaceae is questionable.Phylogenetic analysis of combined ITS and LSU genes,confirm the placement of Septoriella oudemansii in Phaeosphaeriaceae.However,it is not represented by the generic type,thus the placement of Septoriella is questionable.Setophaeosphaeria is excluded from Phaeosphariaceae as the type species,Sp.hemerocallidis forms a clade at the base of Cucurbitariaceae.Wilmia clusters in Didymosphaeriaceae and is synonymized under Letendraea.Barria,Chaetoplea,Hadrospora,Lautitia,Metameris,Mixtura and Pleoseptum are excluded from Phaeosphaeriaceae based on their morphological characters.The asexual genera Mycopappus and Xenostigmina are excluded from this family based on the phylogenetic evidence;these genera form a clade close to Melanommataceae.

Towards a natural classification and backbone tree for Pleosporaceae

The family Pleosporaceae includes numerous saprobic,opportunistic human,and plant pathogenic taxa.The classification of genera and species Pleosporaceae has been a major challenge due to the lack of a clear understanding of the importance of the morphological characters used to distinguish taxa as well as the lack of reference strains.Recent treatments concluded that Pleospora and some other genera in Pleosporaceae are likely polyphyletic.In order to establish the evolutionary relationships and to resolve the polyphyletic nature of Pleospora and allied genera,we sequenced the 18S nrDNA,28S nrDNA,ITS,GAPDH,RPB2 and TEF1-alpha gene regions of Pleosporaceae species and phylogenetically analysed this data.Multigene phylogenies strongly support the monophyletic nature of Pleosporaceae among the other families in Pleosporales,and the acceptance of the genera Alternaria,Bipolaris,Clathrospora,Comoclathris,Curvularia,Dactuliophora,Decorospora,Diademosa,Exserohilum,Extrawettsteinina,Gibbago,Neocamarosporium,Paradendryphiella,Platysporoides,Pleospora,Porocercospora,Pseudoyuconia and Pyrenophora.Austropleospora,Dendryphion,Edenia and Macrospora are excluded from the family based on morphology coupled with molecular data.Two novel species,Alternaria murispora in this paper and Comoclathris sedi are introduced.The sexual morph of Alternaria alternata is re-described and illustrated using modern concepts from fresh collections.The paraphyletic nature of Pleospora is resolved based on the available morpho-molecular data,but further sampling with fresh collections,reference or ex-type strains and molecular data are needed to obtain a natural classification of genera and the family.

Biphasic taxonomic approaches for generic relatedness and phylogenetic relationships of Teichosporaceae

The placement of the dothideomycetous family Teichosporaceae has been controversial.Recent phylogenetic investigations have used a taxonomic lumping approach with the Floricolaceae and its genera have been synonymized under the earlier fam-ily name,Teichosporaceae.Intergeneric relationships were therefore obscure and proper generic delimitation was needed in upcoming studies.We here taxonomically revised the family Teichosporaceae based on both morphological and phylogenetic evidence.Teichosporaceae species have immersed or semi-immersed,erumpent to superficial,ostiolate ascomata,cellular or trabeculate pseudoparaphyses,cylindrical to oblong or sub-clavate asci and ellipsoid to oblong or fusiform,cylindric-fusiform or oblong to elliptical,ovoid to clavate,symmetric or asymmetric,initially hyaline or pale brown to dark brown or yellowish brown,1-3-septate or muriform ascospores.Asexual morphs are coelomycetous.Type or representative speci-mens of Teichosporaceae were loaned and fresh specimens were collected from China and Thailand.Maximum likelihood and Bayesian analyses of a combined ITS,LSU,SSU,tef1-αand rpb2 dataset were performed to clarify the phylogenetic affinities of taxa and examine monophyly of newly proposed genera.One new species(Floricola festucae),one new host record(Ramusculicola thailandica)and four new combinations(Aurantiascoma nephelii,A.quercus,Magnibotryascoma acaciae,M.melanommoides)are introduced.The broad genus concept of Teichospora is dismissed based on morphological dissimilarities and the monophyletic status of the proposed genera.We accept Asymmetrispora,Aurantiascoma,Floricola,Magnibotryascoma,Misturatosphaeria,Pseudoaurantiascoma,Pseudomisturatosphaeria,Ramusculicola and Teichospora as distinct genera in the Teichosporaceae.All recognized genera are phenotypically characterized and phylogenetically well-supported.The phylogenetic placements of three genera(Chaetomastia,Loculohypoxylon and Sinodidymella),which do not have molecular data cannot be conclusively clarified at present,but are still placed in Teichosporaceae for future studies.