Torrentispora fibrosa gen. sp nov (Annulatascaceae) from freshwater habitats

Torrentispora fibrosa gen. sp. nov. (Ascomycota, Annulatascaceae) is descri bed based on specimens from submerged wood collected from streams in Tai Po Kau Forest Reserve, Hong Kong. T. fibrosa is characterized by immersed to superficial ascomata with a peridium of black cells arranged in irregular r ows, wide septate paraphyses, long cylindrical asci with a relatively massi ve refractive apical ring, and unicellular ascospores with a fibrillar shea th. Illustrations from light and scanning electron microscopy are provided. It is compared with species in the genus Annulatascus, from which it diffe rs in ascoma peridium and ascospore sheath morphology, and with other aquat ic ascomycetes possessing ascospores with a similar fibrillar sheath struct ure.