North American species of Mycena.

EUMYCENA: TYPICAE

313

tively filed it under M. niveipes. The pilei were up to 5 cm. broad
and very dark gray over all even at maturity, the stipe was smooth,
no distinctive odor was present, and the gills were drab gray at
maturity. In its stature and consistency it is practically identical
with M. niveipes. If the characters mentioned above are found to be
constant, it may be desirable to give it at least the rank of a variety.
Bisby's report of M. Jacobi was based on odorless specimens of M.
niveipes. Overholts (1655) collected another variant of the species
on May 8, 1914, near Creve Coeur, Missouri. The following description is taken from his notes: Pileus 2.5-5 cm. broad, campanulate,
at first watery brown, becoming grayish and slightly tinted rose color,
moist, glabrous, widely wrinkled-striate on the margin; flesh white,
taste and odor strongly alkaline; lamellae adnexed or adnate with a
decurrent tooth, broad, rather distant, white; stipe central, equal,
hollow, splitting into two or three segments, shining, white-villose at
base, 4-9 cm. long, 3-5 mm. thick; spores 7.5-8.5 X 5-6,.
Sections of the material verified Overholts's spore measurements
and revealed the presence of the numerous typical pleurocystidia and
cheilocystidia. The collection appears to be distinguished by its
smaller spores and, possibly, by a more homogeneous pileus, although
the latter character should be restudied from fresh material.
152. MYCENA MACROCYSTIDIATA Singer
Ann. Myc., 34:430. 1936
Illustrations: Plate 69; Text fig. 39, nos. 3-5 (p. 316).
Pileus 1-5 cm. broad, conic when young, becoming obtuse or
broadly campanulate in age, sometimes umbonate and the margin
plane, surface hoary but soon becoming naked and moist, color
"plumbeous black" at first, fading through "bone brown" to paler
grayish brown, only subhygrophanous, slightly translucent-striate
when moist, frequently very finely radially wrinkled-striate nearly
to the disc, margin sometimes whitish at first; flesh thin, fairly pliant,
pallid, taste acidulous, odor nitrous; lamellae adnate or with a decurrent tooth, close but appearing subdistant in broadly expanded
caps, moderately broad and becoming ventricose in age, white at
first, in age sometimes assuming a grayish-incarnate tinge; stipe
(1.5) 4-11 cm. long, 1-3 (5) mm. thick, equal or compressed, tubular,
fragile, surface with a hoary bloom at least toward the apex, sometimes longitudinally striate, white-strigose at the base, color deep