North American species of Mycena.

EUMYCENA: CALODONTES

217

ished, translucent-striate, hygrophanous, color extremely variable,
usually some shade of grayish or brownish yellow but sometimes
bright yellow or nearly white (buttons "baryta yellow" or "citron
yellow," changing to "olive lake" in age), fading to yellowish or olive
gray, sulcate in age; flesh thick on the disc in large caps, otherwise
thin, grayish yellow to whitish, fragile, odor and taste not distinctive;
lamellae ascending-adnate, equal, distant to subdistant, 14-20 reach
the stipe, two or three tiers of lamellulae, narrow (2-3 mm. ~), intervenose, whitish or cinereous, edges pale yellow or sordid yellowish
brown (the color often very inconspicuous in faded specimens); stipe
3-8 cm. long, (0.5) 1-2.5 mm. thick, equal, fragile, hollow, terete or
compressed, base somewhat mycelioid, either glabrous or pubescent
(depending on moisture conditions at the time of development), the
apex pruinose at first, either smooth or somewhat striate, color olivaceous gray or yellowish, usually paler and brighter above.
Spores 8-11 X 4-5.5 (6) Mt (12-14 X 5-6 g, two-spored), narrowly
ellipsoid to subcylindric, distinctly bluish in iodine; basidia two-,
three-, four-spored; pleurocystidia absent or very rare to occasional,
fusoid-ventricose, 36-52 X 9-15,; cheilocystidia abundant and
variable, awl-shaped, fusoid-ventricose or clavate (all of these types
either smooth, variously branched, or with fingerlike prolongations
over the upper portion); gill trama homogeneous, vinaceous brown in
iodine; pileus trama characterized by a thin nongelatinous pellicle,
a well-differentiated hypoderm, and a filamentous tramal body, all
but the pellicle vinaceous in iodine.
Habit, habitat, and distribution.-Single, scattered, or gregarious
among mosses or on needle carpets under conifers, also on humus and
among fallen leaves in groves of oak and beech. I have examined
specimens from New York, Michigan, Washington, Oregon, and
California in the United States and from Ontario, Manitoba, and
British Columbia in Canada. It fruits during the spring and fall
months, but is quite sporadic.
Material studied.-Smith, 32-1, 32-61, 32-520, 32-644, 707, 734,
1376, 1610,1747, 2408, 2549, 3289,3882,4320,5055, 6235,6997,8588,
8663, 8722, 8916, 13846, 15038, 15857, 16008, 16624. Atkinson,
15122, 19023, 24106. Bisby, Winnipeg, Manitoba. Davidson, 201.
Mains, 31-678, 32-61.
Observations.-In the course of my study of this species I have
examined many more collections than those cited above, particularly