Community find

Honey Mushroom

Armillaria mellea

Group

gilled mushroom

Season

Late summer to late autumn, often fruiting after significant rainfall.

Habitat

Typically found in dense clusters at the base of trees or on buried wood, both deciduous and coniferous. It is a parasitic and saprophytic fungus found in woodlands, forests, and sometimes even in gardens and urban areas.

Key characteristics

Cap: Typically 3-15 cm wide, convex to flattened, often with a central uplift (umbo) when young, ranging from honey-yellow to yellowish-brown, sometimes with darker scales, especially when young. Gills: Attached to slightly decurrent, whitish to yellowish, darkening with age. Stem: 5-20 cm long and 1-3 cm thick, fibrous, uniform in width or slightly tapering towards the base, often with a persistent ring (annulus) that can be white to yellowish. The stem below the ring can be scaly or fibrous, often brownish. Spore print: White to pale cream.

Look-alikes

Several other Armillaria species exist and can be difficult to distinguish without microscopic examination. Galerina marginata (Deadly Galerina) is a deadly toxic mushroom that can sometimes resemble smaller, darker Honey Mushrooms and grows in similar habitats, but has a rusty-brown spore print and typically lacks the prominent ring of Armillaria mellea. Pholiota species can also look similar but often have a slimy cap and darker spore print. Desarmillaria tabescens (Ringless Honey Mushroom) lacks an annulus.

Ecological role

Armillaria mellea can be a significant forest pathogen, acting as a parasitic fungus that causes root rot on a wide range of woody plants, leading to weakened or dead trees. It also functions as a saprophyte, breaking down dead wood and contributing to nutrient cycling in forest ecosystems. Its mycelial cords (rhizomorphs) can spread extensively through the soil and under bark, facilitating its parasitic spread.