North American species of Mycena.

EUMYCENA: TYPICAE

265

Material studied.-Smith, 745, 754, 985, 2491, 3132, 3907, 4137,
4748, 6517, 7509, 7525, 8043, 8818, 9047, 10838, 14729, 17015. Hesler, 9623, 10459, 11492, 12387, 12828. Kauffman, August, 1924
(two collections as M. albogrisea), North Carolina. Mains, 34-168,
34-172, 34-183. Parlin, Maine. Slipp, UIFP: 3225. Wehmeyer,
643, 645, 755, 755a.
Observations.-The broad gills are a rather reliable macroscopic
character, but the cystidia are the most significant microscopic feature. Aside from these two characters, this species could be regarded as just another gray Mycena. Its colors are not distinctive,
and its stature and consistency vary a great deal, depending on the
location. Fruiting bodies from dense mossy forests are more fragile
than those found in the open. The lubricous to subviscid feel of the
pileus is caused by the well-developed pellicle and is most noticeable
in the carpophores with a cartilaginous consistency. The pellicle
does not gelatinize in either water or KOH. My first observations
were based on rather cartilaginous specimens. Further collecting
revealed the differences mentioned above. The species in no way
reminds one of M. galericulata. M. clavicularis has the same stature,
appearance, and broadly adnate gills but is readily separated by its
viscid stipe and different pleurocystidia.
125. MYCENA CONSTANS (Pk.) Saccardo
Syll. Fung., 5:296. 1887
Agaricus (Mycena) constans Peck, Ann. Rep. New York State Mus., 27: 93.
1875.
Prunulus constans Murrill, North Am. Flora, 9: 327. 1916.
"Pileus submembranaceous, campanulate or convex, striate, palecinereous; lamellae close, ascending, uncinate, white; stem slender,
equal, smooth, colored like the pileus, with hairy filaments at the
base; odor alkaline.
"Plant about 2' high, pileus 1"-3" broad.
"Among mosses in woods. Forestburgh. Sept.
"In general appearance it bears some resemblance to small forms
of A. vulgaris, but it is easily separated by its dry stem and its odor of
hartshorn, which is very distinct when the plant is first gathered."
The following data were obtained from an examination of the
type: The spores measure 6-8 X 3-3.5 i and are narrowly ellipsoid,
smooth, and hyaline. The basidia are four-spored. Pleurocystidia