M. leprosula M. minutula M. porphyrospoda M. rufofusca Myochroidea is a genus of lichen-forming fungi of uncertain familial placement in the order Lecanorales.

[2] The genus was proposed in 2008 by the lichenologists Christian Printzen, Toby Spribille, and Tor Tønsberg, with Myochroidea rufofusca assigned as the type species.

This naming is inspired by the characteristic grey or brown-grey colour of the lichen's body (thallus), reminiscent of the hues found in a mouse's fur.

These structures are seated directly on the thallus and may range from flat to significantly rounded, maintaining a matte or slightly shiny appearance.

However, Helocarpon is distinct due to its carbonised underlayer (hypothecium) and surrounding tissue (exciple), as well as its lack of thickening at the tips of the excipular hyphae.

On the other hand, Xyleborus sets itself apart with a gelatinous exciple that features radiating, lightly branched hyphae and the unique presence of spore-producing structures (sporodochia).