North American species of Mycena.

264 NORTH AMERICAN SPECIES OF MYCENA

Prunulus latifolius Murrill, North Am. Flora, 9: 327. 1916.
Omphalopsis Bakeri Murrill, ibid., p. 315.
Omphalia Bakeri Murrill, Mycologia, 8: 220. 1916.
Illustrations:
Plate 48 A, B; Text fig. 29, nos. 7-9 (p. 251).
Lange, Flora Agar. Dan., 2, pl. 55 B (good).
Peck, Ann. Rep. New York State Cab., 23, pl. 6, figs. 8-14.
Smith and Wehmeyer, Pap. Mich. Acad. Sci., Arts, and Letters, 21, pl.
26, fig. 2.
Pileus 8-25 mm. broad, obtusely campanulate when young, the
margin straight, becoming broadly campanulate, broadly conic, or
broadly convex, sometimes expanded and with a low obtuse umbo,
faintly hoary but soon moist and lubricous, sometimes subviscid
(large specimens), color blackish to pale gray, the margin pallid,
"olive gray" on the disc or pale cinereous over all in age, translucentstriate when moist, at times somewhat sulcate after fading; flesh thin
but tough or somewhat fragile in small carpophores, grayish to pallid,
odor slight, taste farinaceous; lamellae broadly adnate, often with a
decurrent tooth, close to subdistant, rather broad, white or grayish,
edges even and pallid; stipe 2-5 (7) cm. long, 1-2 mm. thick, equal or
tapered at the base, cartilaginous and fragile, tubular, terete, or compressed, base covered with a dense white tomentum or coarsely whitestrigose, glabrous above, the apex pruinose at first, concolorous with
the pileus or nearly so, usually pallid toward the apex.
Spores 7-9 X 3.5-4,, narrowly ellipsoid, strongly amyloid; basidia
four-spored; pleurocystidia scattered to abundant, 54-90 X 8-12 P,
fusoid-ventricose to subcylindric, with long slightly tapered necks,
the ventricose portion verrucose or smooth; cheilocystidia variously
shaped, clavate to fusoid-ventricose, the enlarged portion covered
with short or long obtuse protuberances (occasionally contorted or
branched and the protuberances also branched in some); gill trama
homogeneous, faintly vinaceous brown in iodine; pileus trama with
a well-differentiated pellicle, the hyphae of which give off numerous
rodlike projections, the hypoderm well differentiated, the remainder
of rather broad hyphae, pale vinaceous brown except for the pellicle.
Habit, habitat, and distribution.-Gregarious on needle beds under
conifers, often in great quantity, from Nova Scotia, Canada, across
the continent to Cape Flattery in the state of Washington and south
to California in the West and North Carolina and Tennessee in the
East; generally most abundant during late summer or early fall.