North American species of Mycena.

300 NORTH AMERICAN SPECIES OF MYCENA

Kauffman, Agar. Mich., 2, pl. 162 (as Collybia alcalinolens).
Lange, Flora Agar. Dan., 2, pi. 56 E.
Ricken, Die Blitterpilze, pl. 109, fig. 9.
Pileus 10-30 (35) mm. broad, convex to obtusely campanulate
when young, the margin usually incurved, soon broadly convex, with
a broad low umbo or nearly plane, the margin often reflexed in age,
surface smooth or slightly uneven, glabrous, lubricous when moist,
subhygrophanous, color "drab" or darker on the disc at first, the
margin whitish, becoming "wood brown" to "buffy brown" or "avellaneous" on the disc, and finally "mouse gray" to "light grayish olive"
or pale cinereous over all, sometimes becoming nearly white (in general
sordid grayish brown to dark gray at first and fading to avellaneous,
pale cinereous, or nearly white in age), translucent-striate when
fresh, sometimes becoming sulcate-striate; flesh thick on the disc,
moderately thin on the margin, watery gray, odor and taste merely
slightly farinaceous or not distinctive; lamellae adnate with a tooth
or adnexed in age, often separating from the stipe but adhering to
each other and thus forming a collar, close to subdistant, 25-34 reach
the stipe, three or four tiers of lamellulae, narrow but becoming ventricose and broad (3-4 mm.), pale ashy gray, occasionally with an
incarnate tinge, edges concolorous with the faces, often stained with
sordid-brownish spots; stipe 4-7 cm. long, 2-4 mm. thick, equal or
sometimes enlarged above, terete or compressed, fragile to fairly
cartilaginous, base usually curved and prolonged beneath the leaves
into a white-strigose pseudorhiza, surface pruinose at first and hoary,
soon polished and moist, translucent, "Quaker drab" (bluish gray)
when fresh, soon more or less concolorous with the pileus, sometimes
pallid in age.
Spores (7) 8-11 X 3-4.5 u, subcylindric to narrowly pear-shaped,
smooth, faintly amyloid; basidia four-spored; pleurocystidia not
differentiated; cheilocystidia clavate, smooth, or with obtuse contorted projections scattered over the apex, 30-42 X 7-11 u; gill
trama homogeneous, vinaceous red in iodine; pileus trama with a
thin nongelatinous pellicle, a slightly differentiated hypoderm, and
the remainder filamentous, vinaceous red in iodine.
Habit, habitat, and distribution.-Scattered to subcespitose among
fallen leaves in open oak woods; Michigan, Nova Scotia. I have
found this species in three localities near Ann Arbor. In one it appears quite regularly in late October and November.
Material studied.-Smith, 33-1141, 33-1141a, November 16, 18,
1931, Michigan. Kauffman, November 8, 1911, November 13, 1926,
Michigan. Mains, two collections. Wehmeyer, 128.