1. Fungus with a brown cap and white gills and a membranous ring halfway up the stalk
   "The booted armillaria was easily identified by its distinctive ring";
   - Armillaria caligata

1. Genus of edible mushrooms having white spores an annulus and blue juice; some are edible; some cause root rot
   - genus Armillaria

Type of: agaric, fungus genus

Part of: family Tricholomataceae, Tricholomataceae

Encyclopedia: Armillaria