North American species of Mycena.

470 NORTH AMERICAN SPECIES OF MYCENA

colorous: lamellae decurrent, white, distant, rather broad: stipe
dilated above, smooth, glabrous, white, 2 cm. long, 2 mm. thick."
Type collected along the Tepeite River, 2,100 meters' elevation,
near Cuernavaca, Mexico. The type consists of a single carpophore
of rather firm consistency. When revived it is distinctly fleshy.
In the dried condition the gills are a very pale violaceous brown, and
the color of the cap tends toward violaceous umber. The stipe is
tinged yellowish. The trama of the pileus is homogeneous, and no
distinctive features were noted. The basidia are four-spored. The
spores are yellowish in iodine, 7-8 (9) X 4-5 ju, smooth, and ellipsoid.
Pleurocystidia and cheilocystidia are not differentiated. To judge
from the color assumed by the carpophore when dried, this species
should be quite distinctive among the small white agarics with more
or less decurrent gills.
OMPHALIA TEPEITENSIS Murrill
Mycologia, 8: 220. 1916
Omphalina tepeitensis Murrill, North Am. Flora, 9: 348. 1916.
"Pileus hemispheric, solitary, 8 mm. broad; surface smooth,
glabrous, white, hygrophanous, not viscid, margin incurved, concolorous: lamellae decurrent, white, distant, rather broad: stipe unusually long, cylindric, equal, smooth, glabrous, snow-white, 4 cm.
long, nearly 2 mm. thick."
Type collected on the ground in humus in a moist virgin forest
along the Tepeite River, 2,100 meters' elevation, near Cuernavaca,
Mexico.
The spores of the type measure 8-10 X 4-5 ut, are hyaline in KOH,
smooth, and yellowish in iodine. The basidia are two-spored, and no
pleurocystidia or cheilocystidia were seen. The tramae of the pileus
and gills each appear homogeneous and not otherwise distinctive.
The dried fruiting body resembles a carpophore of M. pseudolactea
Ktihner in stature, but when revived was more cartilaginous. It is,
of course, distinguished from Ktihner's species by the lack of cystidia.
However, it may be merely the two-spored form of 0. cuspidatella.