LIMACOSPORA GEN-NOV AND A REEVALUATION OF CERIOSPOROPSIS-CAMBRENSIS

Fresh collections of Ceriosporopsis sundica enabled an ultrastructural study of ascospores and spore appendage ontogeny. Ascospores are surr ounded by an exosporic mucilaginous sheath of variable morphology, ini tially ''slug-shaped'' but at maturity ovoid. The fibrous component of the appendage is contiguous with the mesosporium through discontinuit ies in the episporium. Polar appendages are extensions of the sheath a nd not discrete mesosporial outgrowths as characteristic of Ceriosporo psis spp. A reexamination of the type material of C. cambrensis shows that spore measurements differ from those given by an earlier research er, as does the general morphology of the appendages. It is concluded that two species are involved and C. cambrensis must be regarded a nom en dubium.