North American species of Mycena.

EUMYCENA: ADONIDAE

175

"Pileus conic to convex, becoming nearly expanded, solitary or
gregarious, about 1 cm. broad; surface moist, glabrous, striate, miniatous or incarnate, the margin paler, entire, appressed when young:
lamellae nearly free, crowded, inserted, ventricose, white with a
yellowish tint: spores ellipsoid, smooth, hyaline, 7-8 X 4-5 u: stipe
unusually large at the center and tapering at both ends, smooth,
glabrous, translucent, pale-yellow, 6 cm. long, 2-3 mm. thick.
"Type collected on the ground, probably on dead wood, in woods
near Seattle, Washington, October 20-November 1, 1911, W. A.
Murrill 468 (herb. N. Y. Bot. Gard.).
"Distribution: Known only from the type locality."
I have looked for this species in vain. A study of the type yielded
the following data: The spores measure 7-8 X 4-5 u and are ellipsoid, hyaline, smooth, and nonamyloid. The basidia seen were all
two-spored, but "tetrads" and "diads" of spores were both noted in
mounts from the type, which indicates that four-spored basidia were
present. There appears to be a copious secretion of a mucilaginous
substance in this species; most of the spores adhere in groups when
the sections are revived in KOH. Pleurocystidia and cheilocystidia
are similar and quite abundant, and have their apices incrusted with
an amorphous substance in revived mounts. They are decidedly
ventricose, 10-15 /u broad, and have short necks terminating in obtuse
apices. Many smaller cystidia are also present in the hymenium.
These are of the same shape as the others but measure 22-36 X
7-10 y. The larger individuals are 30-46 u long and project up to
10, beyond the basidia. The gill trama is yellowish in iodine.
The pileus trama is very compact and is characterized by a welldeveloped pellicle, the hyphae of which are covered with numerous
short rodlike projections. All parts were yellowish in iodine, and
there did not appear to be a distinct hypoderm.
If one had fresh material in hand it might be very easy to characterize this species accurately. I feel almost certain that the character of the stipe, which Murrill emphasized, is merely a chance
variation. The species clearly falls in the very confusing group of
reddish Mycenae centered around M. adonis. At first I thought it
was identical with M. roseocandida because of its obtuse cystidia.
After studying the types again, however, I am inclined to keep the
two separate. Since dried specimens of all species in this group look
about alike, not much emphasis can be placed on gross characters in
herbarium material. Because of its obtuse cystidia it is apparently
distinguishable from M. adonis.