SUMMARYThe manner of basidial development, the basidial morphology, and the conglutinate or gelatinized condition of the hyphae were found to be a combination of characters which are taxonomically significant in determining the limits ofXenasma.As herein delimited, this genus is considered to be a natural taxon now composed of twenty species. The generic description has been expanded somewhat to include both non-amyloid- and amyloid-spored species, and to include gloeocystidiate species. Three species previously placed inXenasmahave been excluded.