Ultrastructure of sporulation in the Hemiascomycetes Ascoidea corymbosa, A. rubescens, Cephaloascus fragrans, and Saccharomycopsis capsularis

Abstract

Sporulation in 4 spp. belonging to 3 different families of the Hemiascomycetes is described from serial sections. In each species the formation of the ascospore wall is initiated at a specialized spindle pole body. Spore delimitation proceeds concurrently with the last nuclear division in the ascus. The findings support the taxonomic position that these species belong to a group that includes yeasts but is distinct from the Euascomycetes.