North American species of Mycena.

280 NORTH AMERICAN SPECIES OF MYCENA

134. MYCENA SUBPLICOSA Karsten
Acta Soc. pro Fauna et Flora Fenn., 9: 2. 1893
Illustrations: Plate 47 B; Text fig. 33, nos. 7-8 (p. 275).
Pileus 1-2 cm. broad, obtusely conic, becoming campanulate or
expanded-umbonate, margin appressed against the stipe when young,
often flaring somewhat in age, striate to the disc when moist, somewhat sulcate when faded, surface densely hoary-pruinose when young
but soon naked, scarcely hygrophanous, when moist "fuscous" on the
disc, pale grayish toward the whitish margin, fading to "hair brown"
on the center and the margin cinereous, in age the margin often
sordid ochraceous; flesh thin, scarcely fragile, grayish to pallid, odor
and taste mild; lamellae ascending-adnate, close, 23-26 reach the
stipe, narrow to moderately broad (2-2.5 mm.), whitish, becoming
gray, strongly intervenose, edges even and pallid; stipe 3-4 cm. long,
1.5 mm. thick, equal, tubular, rigid-cartilaginous but moderately
fragile (not splitting readily when collected), base white-strigose, apex
frosted at first, soon naked and smooth, concolorous with the pileus
or paler.
Spores narrowly ellipsoid, pointed at one end, 6-8 (9) X 3.5-4 g,
amyloid; basidia four-spored, 20-22 X 4-5,; cheilocystidia saccate
to pedicellate with a globose head, the head more or less covered with
short rodlike projections, 25-30 X 8-15 A, abundant and usually
forming a sterile band, hyaline; pleurocystidia similar to cheilocystidia, scattered; gill trama vinaceous brown in iodine; pileus trama
with a thin adnate pellicle, a well-defined hypoderm, and the remainder of filamentous hyphae, all but the pellicle vinaceous brown
in iodine; stipe tissue vinaceous brown in iodine.
Habit, habitat, and distribution.-Gregarious under spruce on
needle beds during October and November; New York, Michigan,
Washington, Oregon, and California.
Material studied.-Smith, 32-662, 3329, 3341, 3438, 7943, 7944,
7980, 8053, 8494, 8833, 16496, 17013, 18122, 18126, 18128, 18150,
18177. Kauffman (as M. atroalba), New York.
Observations.-Karsten did not describe the cystidia for his species,
and as a result it cannot be stated definitely that the material I have
referred to it is properly identified. My determination is based on
the tendency of the pileus to become sulcate-striate, the small spores,
and the stature, all characters which distinguish Karsten's species.
As is indicated by its arrangement here as well as by its name, it ap