North American species of Mycena.

138 NORTH AMERICAN SPECIES OF MYCENA

characters. M. Sabali, unfortunately, is not sufficiently well characterized at present to be considered here. It is the only other species
known to have similar cystidia. Its habitat is peculiar and should
aid materially in its recognition.
55. MYCENA COPIOSA Cejp
Publ. Fac. Sci. Univ. Charles, 104: 103. 1930
Illustration: Beardslee and Coker, Journ. Elisha Mitchell Sci. Soc., 40, pl.8
(upper right, as M. erubescens).
"Cap 3-8 mm. broad, conic-campanulate, becoming broadly
campanulate with age, dull and opaque in appearance, somewhat
hygrophanous, yellow-brown, shading to deep brown at the center
when moist, pale gray-brown with the center darker when dry, margin incurved and almost fluted when young, striate almost to the
center with age, glabrous, thin and membranous. No odor or taste.
"Gills narrow, not ventricose, somewhat distant, adnate, white,
becoming grayish with age, margin minutely flocculose.
"Stem 5-7 cm. long, scarcely 2 mm. thick, glabrous, colored
like the cap below, paler above, attached by white mycelial fibers to
old leaves, etc. Wounds of the cap and stem exude a copious milky
juice and soon become stained red.
"Spores ellipsoid, 4-4.5 X 6-7 u. Cystidia numerous, 7-19,u
thick at the gills, extending 30-40 / to a slender point. Basidia
4-spored.
"This is smaller than von Hohnel's species is described and has
somewhat different spores, but it seems too close for separation from
his species, of which it seems the American representative. It is
unusual in its milky juice and in the red color which is soon assumed
when the cap is cut. So far it has been detected in only one station."
This is the original account of a fungus Beardslee identified as
M. erubescens. Kiihner placed M. copiosa Cejp in synonymy with
M. galopus in spite of the decided discrepancy in spore size. Since
Beardslee and Cejp agree on the spore size, I am putting the Ohio
collection in Cejp's species but recognize at the same time that, because of the red stains developed by Beardslee's material, it may be
different from the European form. However, in view of the situation
in regard to M. cholea, M. fellea, and M. erubescens, I hesitate to
name it as a new species.