North American species of Mycena.

70 NORTH AMERICAN SPECIES OF MYCENA

corticola but at times with a tendency to be recurved on the margin,
which becomes split in a star-shaped manner, smooth at first, then
long-striate or sulcate, deep lead gray or bluish gray when young,
fading especially on the margin to a bluish or ashy gray or subfuscous,
never purplish rose, white-pruinose under a lens (10X); flesh thin;
lamellae distant, 8-11 reach the stipe, one to three tiers of lamellulae,
lamellae white or whitish gray at the base, sometimes tinted with the
color of the fruiting body, the edges whitish crenulate under a lens,
broadly adnate and often uncinate but usually more or less sinuateascending or ventricose-sinuate; stipe 3-20 mm. long, 0.3-1 mm.
thick, equal, ordinarily curved and ascending, concolorous with the
pileus (grayish blue, then grayish fuliginous), often paler above,
entirely covered with a fine pruina, the base distinctly bristly with
white hairs.
Spores globose, 9-14 /, content granular, amyloid; basidia twoor three-spored or, rarely, four-spored; cheilocystidia 6-8 pg broad,
with rodlike projections over their apices; pellicle of the pileus well
developed (21-26 A thick), the hyphae 2-7.5 A thick, radially arranged and somewhat separated from each other by the gelatinization
of their walls, the walls without pigment, the surface cells furnished
with short projections; flesh of the pileus amyloid.
Habit, habitat, and distribution.-Gregarious on the bark of standing trees, October to February; Europe. I have no herbarium specimens of this species, but have found it rarely in Michigan late in the
fall (November) during prolonged rainy weather. The description
above is translated and adapted from Kiihner because my own notes
are incomplete.
13. MYCENA MADRONICOLA A. H. Smith
Mycologia, 31: 269. 1939
Illustrations:
Plate 6 A, B; Text fig. 3, nos. 7-8 (p. 68).
Smith, Mycologia, 31, fig. 1, A (spores). 1939.
Pileus 5-12 mm. broad, obtusely campanulate to convex when
young, becoming broadly convex and the disc somewhat flattened or
even slightly depressed, surface hoary at first, soon naked and'in age
more or less polished, moist and translucent-striate to the disc, becoming sulcate in age, margin at first appressed against the stipe,
color "hair brown" to "cinnamon brown" and fading to "avellaneous,"