Annulatascus fusiformis sp. nov., a new freshwater ascomycete from the Philippines

Abstract

Annulatascus fusiformis sp. nov. is described based on a specimen collected on submerged wood from a river in the Philippines. The species possesses globose to subglobose, black, immersed ascomata with long hyaline necks; wide, septate, tapering paraphyses, and cylindrical unitunicate asci with a relatively massive refractive apical ring. In this respect it is similar to species of Annulatascus, however, A. fusiformis differs from other species in the genus, as ascospores are provided with bipolar mucilaginous pad-like appendages. The species is illustrated with light, scanning and electron micrographs.