Noun | 1. | Flammulina - a genus of agarics fungus genus - includes lichen genera family Tricholomataceae, Tricholomataceae - a family of fungi belonging to the order Agaricales Flammulina velutipes, winter mushroom - an edible agaric that is available in early spring or late fall when few other mushrooms are; has a viscid smooth orange to brown cap and a velvety stalk that turns black in maturity and pallid gills; often occur in clusters |