Lookalikes to rule out
Deadly Galerina
deadlyGalerina leaves a rusty-brown spore print; honey mushrooms leave white.
Sulphur Tuft
toxicSulphur tuft has greenish-yellow gills and a purple-brown spore print.
Jack-o'-lantern
toxicJack-o'-lanterns are bright orange throughout and lack a ring.
Identification
Look for dense clusters of honey-yellow to brown caps, often with tiny dark hairs near the center. Gills are white to cream and slightly decurrent. The stem has a white, cottony ring. Peel back bark nearby and you may find flat black bootlace-like strands. The spore print is white, often dusting lower caps.
Uses and ecology
Armillaria species are serious tree pathogens that spread through bootlace rhizomorphs and can kill weakened trees. Many species look alike, and their edibility reputations differ. Cook well and try small amounts.
Memorable fact
Related Armillaria colonies in Oregon cover several square kilometers and are among the largest organisms on Earth.
