North American species of Mycena.

GLUTINIPES: FULIGINELLAE

429

developed after the specimens had stood for a few hours. The pilei
of this collection were dark olive and dried an olive gray rather than
the usual yellow or yellowish brown. However, the specimens came
from a very well protected locality on a log in an old windfall. This
may have had some effect on the colors and the manner in which the
specimens dried, so that I hesitate to place much emphasis on the
character, particularly in view of the great variability in color observed in other regions and in different seasons in this variety. M.
epipterygia var. B of Kauffman's Agaricaceae of Michigan is apparently an additional form of var. lignicola with a nitrous odor. The
favorite habitat of the variety and its forms is old hemlock logs well
covered with Dicranum and other mosses, but in the western United
States it is frequently found on the naked bark around knots on fallen
trees of hemlock, balsam, or Douglas fir. The cheilocystidia readily
distinguish var. lignicola from Mf. griseoviridis var. cascadensis.
Kauffman and Smith noted considerable variation in both spore size
and odor in the specimens collected at Rock River, Michigan, and
reported under the name M. epipterygia. Mains found a collection
of four-spored specimens south of Au Train, Michigan, August 27,
1932. They were on a mossy log; the spores measure 6-8 X 5-7 /i,
and the cheilocystidia are covered with short projections. No odor
was noted. In North America this form has usually been identified
as M. citrinella.
SECTION FULIGINELLAE
220. MYCENA CLAVICULARIS (Fr.) Gillet
Les Hymen., p. 257. 1874
Agaricus clavicularis Fries, Syst. Myc., 1: 158. 1821.
Prunulus clavicularis Murrill, North Am. Flora, 9: 330. 1916.
Illustrations:
Plates 93 C, 94 A; Text fig. 49, nos. 8-9 (p. 399).
Beardslee and Coker, Journ. Elisha Mitchell Sci. Soc., 40, pl. 9 (upper
figs.).
Fries, Icon. Sel. Hymen., 1, pl. 84, fig. 1.
Pileus (5) 10-20 mm. broad, convex to obtuse when young, rarely
obtusely conic, becoming broadly convex or with a low obtuse umbo
in age, sometimes becoming depressed on the disc, margin straight
but seldom touching the stipe when young, spreading and uneven in
age, surface pruinose and even when young, naked and wrinkled to