U. luteolum U. roseocremeum Uncobasidium is a genus of two species of crust fungi in the Meruliaceae family .
The genus was circumscribed by mycologists Kurt Hjorstam and Leif Ryvarden in 1978 with the European fungus U. luteolum as the type species.
Uncobasidium forms a crust-like fruit body, which is spread out on the surface of the substrate.
Individual hyphae are distinct when viewed with microscopy, and they range from thin to becoming thick walled, with clamp connections.
The spores of Uncobasidium fungi are ellipsoid to obovate in shape, thin walled, and non-amyloid.