gallica

Bulbous Honey Mushroom

Armillaria gallica is a bioluminescent, wood-decaying fungus found in temperate forests across the Northern Hemisphere. Unlike the highly pathogenic Armillaria mellea, A. gallica is primarily a saprotroph, feeding on dead wood, though it can act as a weak parasite on stressed trees. It is famous for forming massive, long-lived subterranean mycelial networks (rhizomorphs), including one individual in Michigan estimated to be over 2,500 years old and weighing 400 tons. The fruit bodies typically appear in the autumn, growing terrestrially from buried wood or at the base of trees. They are characterized by a yellow-brown to pinkish-brown cap covered in fine scales, and a distinctively swollen or 'bulbous' stem base. The partial veil is delicate and cobweb-like (cortina), often leaving a fragile zone on the stem rather than the thick, membranous ring seen in A. mellea. It plays a crucial ecological role in carbon cycling and is commercially significant as a symbiotic partner in the cultivation of the medicinal orchid Gastrodia elata.