North American species of Mycena.

430 NORTH AMERICAN SPECIES OF MYCENA

sulcate in age, faintly translucent-striate when moist, glabrous, moist
to lubricous but not viscid, color dark to light gray, often bluish gray
at first ("fuscous" to "hair brown" or "drab," "Quaker drab," or
"Chaetura black"), margin pale gray, usually near "pale smoke
gray," not hygrophanous, fading slowly to sordid yellowish or whitish;
flesh thin, pliant, and cartilaginous, grayish or pallid, odor and taste
not distinctive; lamellae bluntly adnate to slightly arcuate, sometimes toothed, subdistant to distant, 15-20 reach the stipe, two or
three tiers of lamellulae, narrow to moderately broad (2 mm. i),
white when young, soon becoming sordid pale gray, edges even and
pallid; stipe 2-5 cm. long, 1-1.5 mm. thick, equal, the base narrowed
slightly or a bit enlarged, elastic, cartilaginous, tubular, pruinose
above when young, soon naked, viscid, glutinous in wet weather,
bluish black to "fuscous" when young and fresh, usually concolorous
with the pileus or paler in age, becoming slightly tinged with yellowish
gray, base slightly mycelioid.
Spores ellipsoid, 7-8.5 (9) X 3-4 u, amyloid; basidia four-spored
or rarely two-spored, 28-33 X 5-6 uz; cheilocystidia and pleurocystidia
similar, scattered to numerous, (22) 30-38 X 9-12 (14) u, broadly
clavate, enlarged portion covered with short obtuse projections,
hyaline; gill trama pale vinaceous brown in iodine, subhymenium
not gelatinous and gill edge not gelatinizing; pileus trama with a thin
adnate nongelatinous pellicle, hypoderm sharply differentiated, its
cells 20-40 X 15-25,u and occupying nearly half the thickness of the
pileus, the remaining tissue floccose and filamentous, all except the
pellicle faintly vinaceous brown in iodine.
Habit, habitat, and distribution.-Gregarious in large numbers
under conifers, particularly Pinus strobus, in the eastern United
States. It is very common during late summer or early fall, and is
apparently not rare during the spring months along the Pacific coast.
I have collected it in Nova Scotia and Ontario in Canada and have
examined material from Alabama, North Carolina, Tennessee,
Pennsylvania, New York, Michigan, Washington, Oregon, and California in the United States.
Material studied.-Smith, 32-91, 32-270, 32-652, 298, 655, 1614,
2513, 3155, 3327, 3464, 3480, 4288, 6994, 7508, 7937, 7974, 8192,
8246, 8284, 9086, 10907, 14432, 14463, 14728, 14804, 14805, 16311,
16380, 16381. Burke, Alabama, 1942. Hesler, 8002, 10945. Mains,
32-124, 32-413, 32-577, 32-624, 5022. Overholts, 19697. Wehmeyer, 656, 656a.