Longicollum biappendiculatum gen. et sp. nov., a new freshwater ascomycete from the Neotropics

Longicollum biappendiculatum gen. et sp. nov. is described from submerged woody debris from a river in Peru. Additional material on submerged wood from Brazil, Costa Rica, Florida and Peru was also examined. The fungus is morphologically similar to members of the family Annulatascaceae. Traits which are shared include dark ascomata with a cylindrical neck, a hamathecium of long septate tapering paraphyses, unitunicate asci with a relatively large nonamyloid ascus apical ring, and hyaline ascospores. The lack of morphometric overlap with existing genera in the Annulatascaceae prompted the erection of a new genus. The new fungus is described, illustrated and compared to morphologically similar taxa.