North American species of Mycena.

PSEUDOMYCENA: BASIPEDES

53

5. MYCENA STYLOBATES (Fr.) Quelet
Champ. Jura et Vosges, p. 109. 1872
Agaricus stylobates Fries, Syst. Myc., 1: 153. 1821.
Pseudomycena stylobates Cejp, Publ. Fac. Sci. Univ. Charles, 104: 150. 1930.
Illustrations:
Plate 1 C, E-F; Text fig. 2, nos. 3-4 (p. 58).
Beardslee, Mycologia, 9, pl. 4, fig. 1.
Beardslee and Coker, Journ. Elisha Mitchell Sci. Soc., 40, pl. 15, lower
left; pl. 16, upper figures.
Lange, Flora Agar. Dan., 2, pl. 54 C and also B (as M. clavularis).
Ricken, Die Blitterpilze, 2, pl. 109, fig. 10.
Pileus 3-15 mm. broad, obtusely conic to convex, the margin
straight or curved in slightly, becoming campanulate, umbonate or
plane, at times the margin flaring or recurved, surface smooth or
spinulose under a lens (especially around the disc), soon glabrous,
moist and glistening somewhat, translucent-striate, color evenly pale
watery gray except for a whitish margin, somewhat hygrophanous
and fading to pallid or nearly white and then more or less uneven or
sulcate; flesh very thin, pallid, no odor or taste; lamellae appearing
close in unexpanded caps and distant at times in old individuals or
sometimes close in large pilei when mature, 8-16 reach the stipe, one
or two tiers of lamellulae, narrow but becoming ventricose and sometimes very broad in age, attached by a line or very narrowly adnate,
sometimes seceding and adhering to each other and thus forming a
collar around the stipe, very pale gray but soon becoming whitish,
edges even; stipe separable from the pileus, (5) 10-60 mm. long, 0.5-1
mm. thick, equal above a flat circular disc, not markedly fragile for
such a small fungus, covered with fine white scattered fibrils or delicately pruinose, glabrescent, bluish gray when very fresh but soon
fading through watery gray to whitish, sometimes whitish from the
first and occasionally somewhat grayish when faded, basal disc striate
(from gill impressions) and pruinose or finely pubescent, soon glabrescent.
Spores 6-8 or 8-10 X 3.5-4.5 i, narrowly ellipsoid, faintly amyloid; basidia four-spored, rarely two-spored; pleurocystidia not differentiated; cheilocystidia abundant and variable, usually clavate with
thick obtuse projections (2-5) arising from near the apex, sometimes
more or less covered with numerous protuberances over the enlarged
portion and the neck more or less contorted, 26-38 X 8-13,u, hyaline;