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Most of Basidiomycetes are characterized by the large sporophore on which the basidia with its basidiospores are borne.

Exobasidiine�, a family of parasitic basidiomycetous Fungi, resembling the Exoascine� in most respects, but producing basidia in place of asci, a remarkable instance of parallel evolution.

Ascomycetes.—In the plants of this family the spores are not supported upon basidia, but instead are enclosed in minute sacs or asci formed from the fertile cells of a hymenium.

All parts of these reddish individuals seemed more or less infected with this disintegration, the basidia divided by transverse diaphragms into several cylindrical or oblong pieces, which finally become free.

In the mushrooms, puff-balls, etc., we find the spores were borne on the ends of basidia, usually four spores on each.