North American species of Mycena.

136 NORTH AMERICAN SPECIES OF MYCENA

Lange, Flora Agar. Dan., 2, pl. 50 B (as M. fellea).
Smith, Am. Journ. Bot., 22, pl. 4, fig. 2 (as M.fellea); fig. 3 (as M. cholea).
Pileus 2-12 (15) mm. broad, ovoid at first, becoming campanulate
or obtusely conic, sometimes papillate and convex, surface smooth,
moist to lubricous and polished, sometimes subviscid, color variable,
"fuscous" to "clove brown" except for the abruptly whitish margin,
fading through reddish browns to drab ("Mars brown," "wood
brown," "warm buff," or yellowish casts often predominating), subhygrophanous and finally fading to grayish or to very sordid grayish
brown, often appearing canescent and silvery in faded condition,
opaque or translucent-striate when moist, sometimes sulcate when
faded; flesh thin, rather pliant and cartilaginous, whitish, usually
staining reddish when cut or bruised, no odor, taste distinctly bitter
-like that of quinine; lamellae subcrowded to subdistant, ascendingadnate, narrow to moderately broad (somewhat ventricose in age),
white to grayish or pallid vinaceous brown, sometimes turning bright
pink when wounded, under a lens pruinose because of the numerous
cystidia; stipe (1) 3-6 (10) cm. long, 1 mm. + thick, flaccid-cartilaginous, equal, straight or flexuous, tubular, lower portion densely
white-strigose when covered with leaves, white-pruinose over all
when young, bluish black toward the apex at first, paler grayish
brown below, fading through brownish grays and apex soon becoming
paler than the lower portion, when broken exuding a few drops of a
white milklike fluid.
Spores 9-12 X 6-8 u, smooth, contents often granular, broadly
ovoid, weakly amyloid; basidia two-spored; pleurocystidia and cheilocystidia abundant and similar, 54-72 X 10-16 u, broadly fusoid with
very sharply pointed apices or ventricose with two or more apical
prolongations, contents usually coarsely granular when fresh; gill
trama homogeneous, pale brownish in iodine; pileus trama with a
moderately thick but not gelatinous pellicle and a sharply differentiated hypoderm, the remainder floccose-filamentous, vinaceous
brown in iodine; stipe tissue reddish vinaceous in iodine.
Habit, habitat, and distribution.-Scattered to cespitose around
logs and stumps or on chips in places where wood choppers have been
working. September, October, and November; Michigan.
Material studied.-Smith, 32-335, 32-465, 32-481, 32-531, 32-548,
32-582, 32-595, 32-625, 5017, 14961, 15503, October 15, 16, 19,
November 18, 1931, Michigan.
Observations.-M. erubescens varies greatly in stature, so much so