North American species of Mycena.

EUMYCENA: TYPICAE

335

naked, moist, opaque, or faintly translucent-striate, becoming sulcate
in age, hygrophanous, color variable, "dark vinaceous drab," "benzo
brown," "hair brown," pale "vinaceous brown" on the disc, margin
pale gray to whitish, fading to pale gray or whitish but vinaceous tints
usually persisting on the disc and seldom present near the margin,
becoming dingy rufescent-spotted in age or where bruised, no odor,
taste slightly farinaceous; lamellae broadly adnate to arcuate, subdistant to distant, 18-21 reach the stipe, two tiers of lamellulae,
moderately broad (2.5-3.5 mm.), whitish, becoming cinereous, and
finally reddish-spotted in age, intervenose at times, edges even and
pallid; stipe 3-6 cm. long, 1-3 mm. thick, equal or slightly enlarged
above, the bases sometimes connate, apex pruinose, midportion with
scattered delicate fibrils at first, base sparsely or densely whitestrigose, glabrous and naked above in age, dark gray or blackish over
all at first, frequently developing dull-vinaceous tints, pale gray in
age except for the base, which becomes sordid purplish or reddish
brown.
Spores broadly ellipsoid, (7) 8-10 X 5-6 u, amyloid (reaction
very strong); basidia four-spored, 22-24 X 7-8 u; cheilocystidia and
pleurocystidia similar, abundant on the edges, rare on the sides, soon
collapsing, 40-60 X 10-18 u, clavate to obovoid, smooth or with one
to several short obtuse often contorted projections, frequently mucronate; gill trama very faintly vinaceous brown in iodine or remaining yellowish; pileus trama with a moderately thick pellicle, the region
beneath it of somewhat enlarged cells, the remainder filamentous,
pale vinaceous brown in iodine.
Habit, habitat, and distribution.-Cespitose to densely gregarious
on stumps and debris of hardwoods, sporadic, common during some
seasons in the late summer and early fall if the rainfall is heavy;
North Carolina, Tennessee, Connecticut, New York, and Michigan
in the United States and Ontario in Canada.
Material studied.-Smith, 32-301, 32-507, 32-566, 32-621, 32 -630, 32-669, 33-1051, 33-1052, 935, 979, 6402, 10928, 11085, 15203,
15246, 15260, 15355. Atkinson, 23759. Hesler, 6510, 10699, 11442.
Kauffman, New York. Kelly, 1382.
Observations.-The colors vary from sordid blackish brown to
grayish brown, but nearly always have a reddish tinge over the disc.
The development of the white hairs over the basal part of the stipe is
directly dependent on the position from which the fruiting bodies
arise. If they come from the upper surface of a log or stick, the hairs