Collybia butyracea is a mushroom of Tricholomataceae family living in green oak and pine forests at low altitude. The cap is thin and breasted while young. It displays olivaceous, clay or greyish colour, deeper in the centre than in the margin that can be white. The cap looks and feels like butter. Below it, the white gills arrive to the border. The stipe is same colour as the cap. The stipe is sometimes flat but it grows in its base where the mycelia remain.
Collybia butyracea is edible, though very poor appreciated.
[photos Jordi Badia]