Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Cortinariaceae
Genus: Gymnopilus
Species: G. junonius
Scientific name: Gymnopilus junonius
Synonyms: Gymnopilus spectabilis, Pholiota spectabilis v. junonia
Common name: Giant flamecap, Spectacular rustgill
Gymnopilus junonius is a large non-edible orange mushroom which is typically found growing in dense clusters on dead tree stumps, logs, or tree bases of hardwoods and conifers. It is a worldwide distributed mushroom.
The cap ranges from 7 to 20 cm across, is convex, and is bright orange, orange/brown, or reddish brown with a dry scaly surface. The stem is 25 to 265 mm long, 8 to 9 mm thick, and often narrows near the base. The frail ring is dusted with rusty orange spores, the flesh is yellow and the gill attachment to the stem is adnate to sub-decurrent. The spore print is rusty orange.