North American species of Mycena.

EUMYCENA: LACTIPEDES

141

Krieger, A Popular Guide to the Higher Fungi (Mushrooms) of New
York State, fig. 108.
Lange, Flora Agar. Dan., 2, pl. 50 G (rather pale).
Marshall, The Mushroom Book, plate facing page 93, upper figure.
White, Conn. State Geol. and Nat. Hist. Surv., Bull. 15, pl. 10.
Pileus 1-3.5 (5) cm. broad, buttons ellipsoid to egg-shaped, expanding to obtusely campanulate or broadly conic, sometimes convex,
sometimes sharply conic, in age plane or with a recurved margin and
an acute or obtuse umbo, margin appressed against the stipe and
usually characterized by a sterile band, which becomes lacerated or
merely crenate, surface at first appearing dry and covered with a
dense pruinose coating, soon becoming polished and moist, translucent-striate at maturity but often opaque at first, sometimes becoming sulcate in age, color dark reddish brown ("carob brown")
on the disc and paler grayish vinaceous toward the margin, margin
whitish in some and the disc pale sordid reddish brown, often stained
dark sordid reddish brown in age; flesh thin, fragile, grayish vinaceous
or pallid, exuding a dark blood-red latex when cut, odor not distinctive, taste mild or bitterish; lamellae close to subdistant, 20-30 reach
the stipe, two or three tiers of lamellulae, narrowly adnate, ascending,
narrow to moderately broad, whitish or grayish vinaceous, soon
stained sordid reddish brown, edges flocculose, pallid or whitish;
stipe (3) 4-8 (14) cm. long, 1-2 (3) mm. thick, equal, rigid, fragile,
hollow, base strigose, upper portion covered with a dense coating of
pallid to pale cinnamon drab pruina, becoming polished in age, exuding a dark blood-red latex when broken.
Spores 8-11 X 5-7 ju, broadly ellipsoid, amyloid; basidia fourspored; pleurocystidia and cheilocystidia similar, rare, scattered or
abundant on faces, very numerous on the edges, 33-60 (80) X 9-192 u,
fusoid-ventricose, apices acute, sometimes forked, hyaline; gill trama
with numerous lactifers, otherwise homogeneous, bright vinaceous
red in iodine; pileus trama with a well-differentiated pellicle and hypoderm, the remainder floccose, vinaceous red in iodine (all parts except
the pellicle), lactifers numerous.
Habit, habitat, and distribution.-Single to cespitose on decaying
wood throughout the United States and Canada. I have examined
material from Alabama, North Carolina, Pennsylvania, New York,
Ohio, Michigan, Wisconsin, Illinois, Missouri, Idaho, Washington,
Oregon, and California in the United States and from Nova Scotia,
Ontario, Manitoba, and British Columbia in Canada. This species