cotylidia is a fungal genus characterized by small to moderately sized, white to palely yet brightly colored, stalked, fan-shaped to funnel-shaped fruit bodies with a smooth to wrinkled hymenium, tissues composed of monomitic hyphae, basidia producing smooth, nonamyloid spores, the absence of clamp connections, and bearing projecting cylindrical, thin-walled, hymenial cystidia. the genus is classified in the hymenochaetales, however the type species, "c. undulata" has not yet been sequenced. phylogenetically-related agaricoid fungi to the two species of "cotylidia" thus far sequenced are in the genera "rickenella", "contumyces", "gyroflexus", "loreleia", "cantharellopsis" and "blasiphalia", and "muscinupta" and the clavarioid genus, "alloclavaria".