North American species of Mycena.

342 NORTH AMERICAN SPECIES OF MYCENA

pale watery gray over all from the beginning); flesh thickish under
the umbo but abruptly thinner over the marginal area (0.15 mm.),
cartilaginous and firm, dark or pale watery gray, changing slowly to
sordid reddish brown when cut or bruised, no odor, taste mild to
faintly farinaceous; lamellae bluntly adnate, becoming toothed and
somewhat sinuate, occasionally rather broadly adnexed, sometimes
attached to each other and forming a collar, close to subdistant, 17-24
reach the stipe, in about three tiers, narrow, becoming moderately
broad (4-5 mm.), whitish to pale gray, soon stained with reddish
spots or sometimes entirely rubescent in age, edges even and pallid;
stipe usually 4-8 cm. long and 2-5 mm. thick, occasionally much
longer, often with a long pseudorhiza (1-5 cm.), densely whitestrigose over the lower portion, glabrous above, sometimes twisted,
nearly equal, hollow, cartilaginous, apex pallid, the remainder concolorous with or paler than the pileus, the base becoming stained
reddish brown to purplish or the entire lower portion sordid wine
color.
Spores ellipsoid, 7-9 (10) X 4-5 (6) Ay, amyloid, basidia 30-35 X
7-8 u, four-spored; cheilocystidia embedded and inconspicuous, 20 -28 X 6-12 y, very irregular in shape and markings, clavate to contorted, some with short rodlike projections on the upper part, some
with irregular branched fingerlike protuberances, and some with wavy
walls and an elongated contorted apex; no pleurocystidia; gill trama
hyaline or very faintly vinaceous brown in iodine; pileus trama with
a thin pellicle, the region beneath it composed of hyphae with only
slightly enlarged cells, the remainder filamentous, yellowish to slightly
vinaceous brown in iodine.
Habit, habitat, and distribution.-Gregarious to cespitose on wood
and debris of both coniferous and deciduous trees. I have examined
material from North Carolina, Tennessee, New York, Michigan,
Colorado, Washington, Oregon, and California in the United States
and from Ontario in Canada. In northeastern North America it is
usually gregarious to subcespitose, whereas along the Pacific coast
it is generally cespitose.
Material studied.-Smith, 33-891, 33-946, 326, 766, 777, 916, 938,
1066, 3089, 3120, 3137, 3366, 3502, 3681, 3717, 3754, 4477, 4791, 7388,
9303, 15087, 15510, 15590, 17540. Atkinson, 23758. Henry, 1262.
Hesler, 9607, 10693, 14907, 14954. Kauffman, three collections
(as M. rugosoides). Mains, 34-148, September, 1932, Munising,
Michigan. Overholts, 1357, 1934. Parlin, 15199, 15501, 15376,
Maine.