Agrocybe amara (Murrill) Singer 1942

Naucoria amara Murrill, sp. nov
Pileus convex to subexpanded, not umbonate, gregarious, 3-4 cm. broad; surface moist, glabrous, somewhat uneven, ochroleucous to isabelline, with a darker zone near the margin, which is not striate and only slightly inflexed when young; context thin, whitish, with the taste decidedly bitter at first, becoming farinaceous, and the odor farinaceous; lamellae slightly sinuate, crowded, plane, rather narrow, whitish to fulvous, very thin, entire and concolorous on the edges; spores broadly ovoid, smooth, melleous under the microscope, 10-12 X 6-7/*; stipe irregular and variable in shape and size, smooth, glabrous, white, shining, hollow, averaging about 5 cm. long and 5 mm. thick.
Type collected on a manure pile under trees in the New York Botanical Garden, July 2, 1915, W. A. Murrill (herb. N. Y. Bot. Gard.).
Distribution: Known only from the type locality.