Ultrastructural observations on Oxydothis alexandrarum

Abstract

Ultrastructural observations on the asci and ascospores of Oxydothis alexandrarum are presented. Asci are cylindrical, unitunicate, with a J+, subapical ring, and a faint canal leading to the apex. At the TEM level the subapical ring is an area of densely staining granular material. The faint canal comprises a region of less electron-dense granular material. Ascospores are filiform with bipolar mucilaginous appendages. The fine structure of the asci in Oxydothis is most similar to that found in the Diatrypaceae.