noun.
The ray-fungus: so called from the rosettes of club-shaped structures in which it presents itself. The disease actinomycosis is caused by the presence of this fungus.
noun.
[capitalized] [NL. (Harz, 1877).] A genus of fungi of doubtful relationship. The type is A. bovis, the ray-fungus. See actinomyces, 1.