North American species of Mycena.

348 NORTH AMERICAN SPECIES OF MYCENA

Illustrations:
Plate 83; Text figs. 41, no. 11 (p. 328); 43, no. 1.
Bresadola, Icon. Mycol., 5, pl. 234.
House, Bull. New York State Mus., 219-220, fig. 2 (as M. Atkinsoni).
Kauffman, Agar. Mich., 2, pl. 170 (as M. inclinata).
Lange, Flora Agar. Dan., 2, pl. 56 C.
Ricken, Die Blatterpilze, 2, pl. 111, fig. 1.
Pileus 2-4 (5) cm. broad, obtusely conic when young, becoming
broadly campanulate or with an obtuse conic umbo and spreading
margin, umbo sometimes disappearing, margin more or less incurved
at first, soon spreading, surface more or less radially rugulose, scarcely
translucent-striate on the margin, lubricous but not viscid, with a
cartilaginous feel, frequently splitting radially to the disc, somewhat
"buffy brown" on the margin, fading gradually (not hygrophanous)
to pale sordid tan or dirty cinnamon brown (near "Sayal brown");
flesh thick on the disc, tapering evenly to the margin, watery gray
becoming pallid, very cartilaginous, odor and taste somewhat to
strongly farinaceous; lamellae adnexed (often broadly adnexed or
sinuate), close to subdistant, 26-36 reach the stipe, three or four tiers
of lamellulae, strongly intervenose, moderately broad (5-7 mm.),
white or grayish white, soon flushed evenly with pale pink, not reddish-spotted, edges even and pallid; stipe 5-9 (12) cm. long, 2-4 (6)
mm. thick, equal, very cartilaginous, hollow, glabrous, naked, smooth
or twisted-striate, often with a long pseudorhiza, pale grayish white
and naked above, pale fuliginous below, base becoming only slightly
sordid brownish in age but not with reddish stains.
Spores ellipsoid, 8-10 (11) X 5.5-7 yt, amyloid; basidia fourspored, 34-40 X 7-9,, sterigmata stout; cheilocystidia numerous,
32-40 X 8-12 tz, clavate to capitate, the apices or the entire enlarged
portion furnished with rodlike projections, which become elongated
in age and somewhat branched; pleurocystidia not differentiated;
gill trama of subparallel hyphae, vinaceous brown in iodine; pileus
trama with very thin pellicle, the hypoderm narrow and of only
slightly enlarged hyphae, the remainder of the flesh floccose, deep
vinaceous brown in iodine except for the pellicle.
Habit, habitat, and distribution.-Scattered to gregarious or subcespitose, usually on decaying hardwood logs, stumps, or debris, frequent during the spring and fall. It occurs throughout eastern North
America and also along our Pacific coast. I have examined material
from Alabama, Tennessee, Pennsylvania, Maine, Massachusetts,