Adusta means burned.
The pileus is fuliginous, cinereous, flesh compact, margin even and inflexed, depressed in the center.
The gills are attached to the stem, decurrent, thin, crowded, unequal, white, not reddening when bruised.
The stem is obese, solid, of the same color as the pileus, not turning red when bruised.
The plant resembles R. nigricans, but can readily be distinguished from it because of the thin, crowded gills and failure to turn red when cut or bruised. The spores are subglobose, almost smooth, 8–9µ; no cystidia. It is found in the woods during August and September. Edible but not first class. It is a plant very widely distributed.
Russula nigricans. Fr.
Photo by C. G. Lloyd.
Figure 146.—Russula nigricans.