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Also known as Laughing Gym, Laughing Cap or Laughing Jim. Large brown-orange mushroom, with a cup of 8 to 12 cm in diameter, and a thick stem with a ring or visible ring zone. The mushroom grows in clusters, and appeared common in that forest, growing on stumps and trunks of several decaying deciduous trees. Cluster is dense, and it looks like several stems are fused in the base. No particular odor. Observed mid-autumn.
Alpine vegetation. In the town park, dominated by deciduous forest, at the edge of a meadow.
It is often confused with Gymnopilus ventricosus; which grows only on coniferous trees – G. junoninus grows on both, coniferous and deciduous decaying trees. Apparently, some subspecies of G. junoninus, found in US or eastern Asia, contain the hallucinogen psilocybin.