Kionochaeta中2个中国新记录种和2个大陆新记录种

Two New Records Species of Kionochaeta from China and Two New Species of Kionochaeta from China's Mainland

对采自贵州省习水国家自然保护区(长嵌沟管理站)和贵州省燕子岩国家森林公园若干份枯枝进行室内的标本保湿处理,对其上的暗色丝孢菌采用形态学鉴定法。根据Kionochaeta(悬刺毛孢属)的典型特征:由菌丝体分枝产生分生孢子梗。分生孢子梗粗大、单生、直立、直或稍弯曲、光滑、具隔、厚壁、褐色至黑褐色、锥形、刚毛状,无或伴生侧生刚毛状分枝的分生孢子梗。可育区域通常在分生孢子梗的中下部,极少在顶端;由紧凑或松弛,不规则或流苏状排列,其上产生产孢细胞。产孢细胞安瓿形,烧瓶形或圆柱形,具2种增殖类型:(1)内壁芽生式,没有持续导致平周变厚;(2)内壁芽生式,持续的及顶式产生新的产孢位点。分生孢子内壁芽生式,顶生,单生,产生一个液滴(在基质上),透明,无隔膜,光滑,椭圆形、梭形、镰状或棒状,极少在两端具一个简单的刚毛。HMZNC0426菌株的典型特征:较长刚毛状分生孢子梗在整个生长过程中缺乏紧密、分枝的产孢结构,但顶端可能产生一系列短的不规则分枝的产孢细胞,刚毛状分生孢子梗基部常伴生一种顶端具产孢结构,较短的分生孢子梗;HMZNC0356菌株的典型特征:分生孢子梗无侧生刚毛状分枝,产胞结构产生在分生孢子梗近中部单一位点上,产孢细胞紧密、无规则排列在分生孢子梗中部;HMZNC0381菌株的典型特征:分生孢子梗中下部着生2~5根侧生的刚毛状分枝,主轴和侧枝的部分顶端着生一系列不规则、短的分枝,其上产生产孢细胞,从而形成可育区域;可育区域位于侧枝下端,构成紧密、分枝、透明至浅褐色的产孢细胞;HMZNC0427菌株的典型特征:分生孢子梗中部着生一根侧生的刚毛状分枝,较短,可育区域位于侧枝下端。根据上述特征鉴定出:Kionochaeta内的K.nanophora Kuthub.&Nawawi(HMZNC0426)和K.spissa P.M.Kirk&B.Sutton(HMZNC0356)为中国新记录种,K.australiensis Goh&K.D.Hyde(HMZNC0427)和K.pughii Kuthub.&Nawawi(HMZNC0381)为中国大陆新记录种。该标本保存在遵义师范学院真菌学标本室(HMZNC)。

Some rotten twigs collected from Xishui National Nature Reserve(Changqiangou Management Station) and Yanziyan National Forest Park of Guizhou Province were treated with moisturizer indoors. The dematiaceous hyphomycetes on them were identified by morphological identification. Kionochaeta have the typical characteristics of conidiophores arising as lateral branches from mycelium. The conidiophores from the species are macronematous, mononematous,erect, straight or slightly curvued, subulate, smooth, septate, thick-walled, brown to dark brown setiform element with or without associated lateral setiform branches. Usually, the feritle areas were located sub-median, rarely also apical of the conidiophores, which are comprised either compact or loosely and irregularly or penicillately arranged branches. The conidiogenous cells grew out of the feritle areas. Conidiogenous cells are ampulliform, lageniform or cylindrical, which produce two types conidia:(1) enteroblastic without progression leading to periclinal thickening;(2) enteroblastic percurrent with progression leading to a new conidiogenous locus. The condia are aerogenous, solitary, which bear in a liquid droplet,hyaline, aseptate, smooth, ellipsoid, fusiform, falcate or clavate, rarely with a single simple setula at each end. The typical features of HMZNC0426 strain: The longer setiform conidiophores lack a dense and branched conidiogenous structure throughout their growth, but produce a series of short, irregularly branched conidiogenous structure at the apex. The base of the longer setiform conidiophores are often accompanied by a shorter conidiophore with apical conidiogenous structure.The typical features of HMZNC0356 strain: The conidiophores have no lateral setiform branches, and the conidiogenous structure is produced at a single site near the middle of the conidiophores. The conidiogenous cells are closely and irregularly arranged in the middle of the conidiophores. The typical features of HMZNC0381 strain: There are 2–5 lateral setiform branches in the lower middle part of the conidiospores. The main body and part of the lateral branches have a series of irregular, short branches on which produce conidiogenous cells form fertile regions. Fertile areas are located at the lower part of the lateral branches, forming compact, branched, light-colored to light brown conidiogenous cells. The typical features of HMZNC0427 strain: There is a lateral setiform branch in the middle of the conidiospores, which is shorter, and the fertile area is located at the lower end of the lateral branch. Identified by the above characteristics, K. nanophora Kuthub. &Nawawi(HMZNC0426) and K. spissa P. M. Kirk & B. Sutton(HMZNC0356) are as new records species to China;K. pughii Kuthub. & Nawawi(HMZNC0381) and K. australiensis Goh & K. D. Hyde(HMZNC0427) are as new recorded species to China's Mainland. The examined specimens are deposited in the Mycological Herbarium of Zunyi Normal College(HMZNC).