Definition of armillaria
- a fungus of a genus that includes the honey fungus, found chiefly in woodland. Its mycelia can grow for a considerable distance, enabling individuals of parasitic species to invade more than one tree.
- Genus Armillaria, family Tricholomataceae, class Hymenomycetes: many species, including A. bulbosa, a single individual of which may span several hectares
modern Latin: from Latin armilla 'bracelet' (because of the bracelet-like frill on the fruiting bodies)