North American species of Mycena.

332 NORTH AMERICAN SPECIES OF MYCENA

Pileus 1-3 cm. broad, ellipsoid to obtusely conic, becoming campanulate or in age nearly plane, surface hoary and dark fuscous at
first, becoming paler in age and finally cinereous, faintly translucentstriate when fading; flesh thin, fragile, grayish, odor and taste subraphanoid; lamellae subdistant, narrow, ascending, pallid; stipe 4-6
cm. long, 1.5-2.5 mm. thick, equal, glabrous, fragile, base whitestrigose, cinereous over all or apex pallid.
Spores 7-9 (10) X 4.5-5.5 L, smooth, amyloid; basidia fourspored; cheilocystidia abundant, 36-48 (53) X 9-14 /, fusoid-ventricose, mucronate or more or less clavate and with several to many
short protuberances (all types observed on a single gill edge); pleurocystidia similar to cheilocystidia but rare, pileus and gill trama
strongly amyloid.
Habit, habitat, and distribution.-On a dead alder tree, August 19,
1941; Anderson Creek, Mt. Baker National Forest, Washington, A. H.
Smith, 16284. Known only from the type locality.
Observations.-In addition to the distinctive odor, the variety is
characterized by the more variable cheilocystidia. The degree of
variability appears about equal to that found in M. citrinomarginata.
162. MYCENA PARABOLICA (Fr.) Quelet
Champ. Jura et Vosges, p. 242. 1872. Sensu Kauffman,
Agar. Mich., p. 800. 1918
Illustrations:
Plate 75; Text fig. 40, nos. 8-9 (p. 320).
Fries, Icon. Sel. Hymen., 1, pl. 80, fig. 3.
Smith, Am. Journ. Bot., 22, pl. 3, fig. 1 (as M. rugosa).
Pileus 2-4 (6) cm. broad, obtusely campanulate to broadly conic
when young, becoming broadly conic or campanulate in age, usually
umbonate, margin connivent with the stipe at first, spreading or flaring
slightly in age, surface densely pruinose at first, soon naked, deeply
and regularly sulcate-striate to the disc, somewhat translucent-striate
when moist, hygrophanous, "sooty black" at first, soon becoming
watery gray, fading to pale ashy gray over all, margin sometimes paler
in both fresh and faded fruiting bodies; flesh thin and fragile, pale
gray, odor and taste not distinctive; lamellae ascending-adnate or
with a tooth, subdistant, narrow to moderately broad, equal, dark
gray with a whitish border at first, in age pale gray over all or whitish,
intervenose; stipe 4-10 cm. long, 2-5 mm. thick, terete or compressed,