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Page number:1609 
Remarks (public):The generic scope accepted here is exclusively that of Donk (1972). However, the knowledge about the relationship between Thanatephorus, Uthatobasidium and Ypsilonidium and between these genera and the Heterobasidiomycetes is far from sufficient. It should be noted that Talbot (1980) emended Ypsilonidium to cover also species with 1-2 septate spores, but according to the description and figure of e.g. Y. anomalum Talbot, this species is better placed in Dacrymycetales.
Both Thanatephorus and Uthatobasidium are microscopically similar to Ypsilonidium but the former houses parasitic fungi which are connected to a Rhizoctonia state while Uthatobasidium is saprobic, without such connection and further separated from Ypsilonidium by its four sterigmata.
Two species are accepted in the genus one of which is found in Northern Europe.

 
Description type:Non-original description 
Description:Ypsilonidium Donk - Proc. Kon. Ned. Akad. Wet. Ser. C 75:371, 1972.; Uthatobasidium sect. Ypsilonidium Donk, Fungus 28:21, 1958.
Fruitbodies loosely adnate, terrestrial or herbicolous, rarely or not (?) growing on wood, with the hymenium and tissue similar to that of the genus Botryobasidium; hyphal system monomitic, hyphae without clamps, thin to moderately thick-walled, branching at more or less right angles, subhymenial hyphae short-celled; cystidia absent; basidia. short-cylindrical, with two sterigmata about as long as the basidia; spores smooth, thin-walled or with slight wall thickening, repetitive, inamyloid, indextrinoid, acyanophilous.
Type species: Corticium sterigmaticum Bourd.
 
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