This section is from the book "Studies of American Fungi: Mushrooms, Edible, Poisonous, Etc.", by George Francis Atkinson. Also available from Amazon: Studies of American Fungi: Mushrooms, Edible, Poisonous, Etc..
In Hebeloma the gills are either squarely set against the stem (adnate) or they are notched (sinuate), and the spores are clay-colored. The edge of the gills is usually whitish, the surface clay-colored. The veil is only seen in the young stage, and then is very delicate and fibrillose. The stem is fleshy and fibrous, and somewhat mealy at the apex. The genus corresponds with Tricholoma of the white-spored agarics. All the species are regarded as unwholesome, and some are considered poisonous. The species largely occur during the autumn. Few have been studied in America.
This plant is usually common in some of the lawns, during the autumn, at Ithaca, N. Y. It often forms rings as it grows on the ground. It is from 5-7 cm. high, the cap 4-8 cm. in diameter, and the stem is 4-6 mm. in thickness.
The pileus is convex and expanded, somewhat umbonate, viscid when moist, whitish or tan color, darker over the center, where it is often reddish-brown. The gills are adnexed and rounded near the stem, crowded, whitish, then clay color and reddish-brown, the edge whitish and irregular. The gills are said to exude watery drops in wet weather. The stem is stuffed, later hollow, somewhat enlarged at the base, white, and mealy at the apex. Figure 152 is from plants (No. 2713, C. U. herbarium) collected in lawns on the Cornell University campus. The plants in this figure seem to represent the variety minor.
Hebeloma crustuliniforme, var. minor. Cap whitish or tan color, or reddish-brown at center; gills clay color (natural size). Copyright.