Two new freshwater species of Annulatascaceae from China

Two new species belonging to Annulatascaceae are described and illustrated on submerged wood from a freshwater stream. Annulatascus menglensis, differentiated from other Annulatascus species by its hyaline ascomatal neck, is also characterized by cylindrical asci with a large bipartite refractive J- apical ring and hyaline fusiform ascospores without sheath or appendages. Aqualignicola vaginata, which is distinguished from A. hyalina in producing a gelatinous sheath surrounding the unicellular hyaline ascospores, is further characterized by its membranous ascomata with lanceolate setae that surround the neck, long cylindrical asci with a relatively large apical ring.