Abstract
Fresh collections of Ceriosporopsis sundica enabled an ultrastructural study of ascospores and spore appendage ontogeny. Ascospores are surrounded by an exosporic mucilaginous sheath of variable morphology, initially "slug-shaped" but at maturity ovoid. The fibrous component of the appendage is contiguous with the mesosporium through discontinuities in the episporium. Polar appendages are extensions of the sheath and not discrete mesosporial outgrowths as characteristic of Ceriosporopsis spp. A reexamination of the type material of C. cambrensis shows that spore measurements differ from those given by an earlier researcher, as does the general morphology of the appendages. It is concluded that two species are involved and C. cambrensis must be regarded a nomen dubium. Key words: appendages, Ceriosporopsis, Halosphaeriaceae, Limacospora, taxonomy, ultrastructure.
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