North American species of Mycena.

EUMYCENA: CALODONTES

207

95. MYCENA PURPUREOFUSCA (Pk.) Saccardo
Syll. Fung., 5: 255. 1887
Agaricus (Mycena) purpureofuscus Peck, Ann. Rep. New York State Mus.,
38:85. 1885.
Prunulus purpureofuscus Murrill, North Am. Flora, 9: 333. 1916.
Illustrations:
Plate 31; Text fig. 22, nos. 1-2 (p. 208).
Beardslee and Coker, Journ. Elisha Mitchell Sci. Soc., 40, pl. 12 (above
as M. rubromarginata).
Pileus 5-25 mm. broad, obtusely conic, the margin often bent in
slightly at first, becoming broadly conic, sometimes campanulate,
occasionally nearly plane in age, the margin usually remaining bent
in slightly, seldom flaring, surface hoary at first but soon naked and
moist, slightly hygrophanous, translucent-striate to the apex when
mature and moist, usually more opaque when young, color dark
purplish over the disc to pale lilac toward the margin, fading to
purplish gray ("slate purple" to "dull Indian purple" on the disc at
first, toward the margin "vinaceous lavender," "pale vinaceous lilac,"
or "light vinaceous lilac," fading on losing moisture); flesh thin but
rather cartilaginous and pliant, purplish gray becoming pallid to
white, odor and taste not distinctive; lamellae ascending, narrowly
adnate, equal, narrow, moderately close, pallid to grayish, edges
"dark slate purple" (very dark grayish purple) and slightly fimbriate;
stipe 3-10 cm. long, 1-2 mm. thick, equal, terete, tubular, rather
cartilaginous and tough, base white-strigose and often prolonged into
a pseudorhiza, glabrous, more or less concolorous with the pileus or
paler above.
Spores 8-10 X 6-7 A (10-14 X 6.7-8.5 /, two-spored), broadly ellipsoid, amyloid; basidia two- or four-spored; pleurocystidia not
differentiated; cheilocystidia abundant and conspicuous, 30-50 (64)
X 7-12 (15) /, more or less fusoid-ventricose, the apices often becoming forked in age, filled with a dull-purplish sap, content granular
or amorphous and dark sordid brown when revived in chloral-hydrate
iodine solution; gill trama homogeneous, vinaceous in iodine; pileus
trama with a well-differentiated pellicle, a distinct hypoderm, and a
filamentous tramal body, all but the pellicle vinaceous brown in
iodine.
Habit, habitat, and distribution.-Single to cespitose on conifer
wood and debris; North Carolina, Tennessee, New York, Michigan,
Montana, Idaho, Washington, Oregon, and California in the United