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Gymnopus acervatus (= Collybia acervata)
Collybia acervata, was transferred into the new genus Gymnopus. This is an attractive species that fruits in tight clusters on conifer wood or debris. The stalks are red-brown and sometimes flattened.
Caps are 2-5 cm across, dry, smooth, convex to flat, red-brown, with paler margin, and ageing tan. Gills are close, narrow, and white or tinged pink. Stalks are up to 10 cm tall, by 5 mm broad, smooth, hollow, and usually darker than the cap. Spore prints are white. Widespread and common, it fruits in clusters on the ground or on rotten wood. It is recognized by the clustered habit and the tall stalks.
Collybia, Rhodocollybia and Gymnopus
In its traditional sense, Collybia includes all three of the above genera and species of this complex are very common in both coniferous and deciduous woodlands. The taxonomy of the Collybia complex, however, has recently been reassessed by Roy Halling and most of the traditional Collybia species are now in the genera Rhodocollybia and Gymnopus. The species remaining in Collybia (treated in my book) are Collybia tuberosa and Collybia racemosa, both of which colonize and fruit on old mushrooms. Species, formerly in Collybia, with pinkish buff spore prints are now in Rhodocollybia. These include R. maculata and R. butyracea.