rosellinia

from The Century Dictionary.

• noun A large genus of pyrenomycetous fungi having mostly carbonaceous superficial perithecia, usually growing upon a subiculum of dark-colored hyphæ. The spores are unicellular and dark brown. About 175 species have been described. They occur chiefly on decaying wood. R. aquila, a common cosmopolitan species, is the type of the genus.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun fungi having smooth perithecia with dark one-celled ascospores