Chaenothecopsis vainioana is a species of lichenicolous fungus in the family Caliciaceae that is found in Europe.

It was first formally described by Czech lichenologist Josef Nádvorník in 1940 as a member of the genus Calicium.

The specific epithet honours Finnish lichenologist Edvard August Vainio.

[2] Leif Tibell transferred it to genus Chaenothecopsis in 1979.

[3] Calicium vainioanum has been reported growing on Arthonia, Lecanactis abietina, and Calicium salicinum.