... cuticle, Volva wanting, ring present Lepiota. Hymenophore confluent, Without cartilaginous bark, b. Stem central, ring present (sometimes vague), Volva wanting, gills attached Armillaria. Without a ring, Gills sinuate Tricholoma. Gills decurrent, Edges acute Clitocybe. Edges swollen Cantharellus. Gills adnate, Parasitic on other mushrooms Nyctalis. Not parasitic, Milky Lactarius. Not exuding juice when bruised, Rigid and brittle Russula. Quite viscid, waxy consistency Hygrophorus. ... — The Mushroom, Edible and Otherwise - Its Habitat and its Time of Growth • M. E. Hard
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