North American species of Mycena.

EUMYCENA: DEMINUTIVAE

107

37. MYCENA SMITHIANA Kiihner
Encyc. Myc., 10: 252. 1938
Illustrations:
Text fig. 7, nos. 10-11 (p.,91).
Kuihner, Encyc. Myc., 10: 253, fig. 80.? Lange, Flora Agar. Dan., 2, pl. 57 H.
Pileus 1-5 (7) mm. broad, obtuse to convex at first with the margin connivent to the stipe, expanding and broadly convex or with a
slightly depressed disc in age, faintly granulose or coarsely pruinose
at first, soon glabrous, moist, hygrophanous, "vinaceous fawn" or
"fawn color" when moist and with distant conspicuous grayish translucent striae, fading and becoming "light Congo pink" to "pale
Congo pink" (dark grayish vinaceous to light grayish vinaceous and
fading to pale pink), soon sulcate-striate, margin even or crenate;
flesh very thin, membranous, and pliant, odor and taste not distinctive; lamellae distant, moderately broad, adnate or with a decurrent tooth, sordid flesh color at first or white, becoming concolorous
with the faded pileus; stipe 3-5 cm. long, less than 1 mm. thick, equal,
very weak and fairly pliant, evenly white-pruinose when young, base
with scattered hairs, at first somewhat sordid grayish toward the
apex, paler below, at maturity concolorous with the pileus.
Spores 8-11 X 4-5 y, narrowly ellipsoid or abruptly tapered
toward the point of attachment, smooth, very weakly amyloid; basidia
four-spored; pleurocystidia not differentiated; cheilocystidia very
abundant, 92-34 X 6-10 /t, clavate, the enlarged portion covered
with obtuse short protuberances, the pedicels subgelatinous (the gill
edge fanning out somewhat as in M. vulgaris when sections are
mounted in KOH, but the gelatinization limited to the pedicels of
the cells); gill trama homogeneous, hyaline in iodine, not appreciably
gelatinizing or only very slightly so in the subhymenium; pileus
trama with a pellicle and a vesiculose tramal body, scattered over the
surface of the pellicle and variously arranged are small clavate to subcylindric cells 8-15 X 5-8 p, the walls of which bear numerous projections, the main portion of the pellicle slightly gelatinous, vesiculose
tramal body hyaline to pale brownish in iodine.
Habit, habitat, and distribution.-Scattered to gregarious on debris
in wet places, late fall; Michigan and also in Europe. I have found
it once. The description is from collection 1147, October 13, 1934,
Mud Lake Bog, Cheboygan County, Michigan.