越南莲座状复苏卷柏一新种——越南卷柏(卷柏科)

Selaginella pseudotamariscina(Selaginellaceae),ano verlooked rosette-forming resurrection spikemoss from Vietnam

该文描述了在越南发现的卷柏科一新种——越南卷柏(Selaginella pseudotamariscina X.C.Zhang&C.W.Chen)。经过分子系统发育分析并与近缘种形态比较,认为该新种是卷柏属(Selaginella)同穗亚属(subg.Stachygynandrum)的一个物种,与S.digitata-S.imbricata分支为姐妹群关系。该新种与卷柏(S.tamariscina)和垫状卷柏(S.pulvinata)的形态近似,其植株均为莲座状,但不同之处在于中叶对称,似披针形,上表面具1沟槽;孢子叶穗略压扁;孢子叶和营养叶性状和排列近似,孢子叶非同形,略异形,正置,腹面孢子叶大于背面孢子叶;背面孢子叶败育,孢子囊仅见于腹面孢子叶基部。

A new species,Selaginella pseudotamariscinaX.C.Zhang&C.W.Chen(Selaginellaceae),is described from Vietnam.The placement of this species withinSelaginellasubg.Stachygynandrumis assessed based on molecular phylogenetic analyses and morphological comparisons with related species.Molecular phylogenetic analyses suggest that S.pseudotamariscinais sister toS.digitata-S.imbricataclade.Morphologically,the new species is similar toS.tamariscinaandS.pulvinataby sharing the rosette-forming habit,but distinguished by its dorsal leaves symmetrical,lanceate,sulcate on upper surface;strobili slightly dorsiventrally complanate and non-resupinate,sporophylls resembling vegetative leaves in form and arrangement,non-resupinate,the ventral sporophylls larger than the dorsal ones,dorsal sporophylls sterile,sporangia only borne on the base of ventral sporophylls.