North American species of Mycena.

EUMYCENA: DEMINUTIVAE

93

October 20-November 1, 1911, W. A. Murrill 688 (herb. N. Y. Bot.
Gard.).
"Distribution: Known only from the type locality."
The spores of the type are variable in size; most of them measured
8-11 X 3.5-4 y. A considerable number measuring 12-14 (16)
X 4-5 (6) pu were found in groups of two. They were subfusiform,
smooth, and hyaline. Unfortunately the iodine reaction was not
obtained. The only basidia seen with sterigmata were two-spored.
No differentiated pleurocystidia or cheilocystidia were observed.
The trama of both the pileus and the gills appeared to be homogeneous
and otherwise not distinctive.
Mycena albissima seems to be close to M. subimmaculata, but
differs sharply in having abundant cheilocystidia. The spores of
M. subimmaculata separate it from M. gracilis and other species with
long, narrow spores. It seems quite probable that M. pseudogracilis
KiKhner & Maire is the same as Murrill's species. However, I have
never seen either in the fresh condition.
24. Mycena McMurphyi (Murr.), comb. nov.
Omphalopsis MlcMurphyi Murrill, North Am. Flora, 9: 315. 1916.
Omphalia McMurphyi Murrill, Mycologia, 8: 220. 1916.
"Pileus rather small and delicate, convex, cespitose, 5-10 mm.
broad; surface smooth, glabrous, white, margin undulate, furrowed,
appressed when young: context thin, white, without characteristic
taste or odor; lamellae decurrent, subdistant, about 20 in number,
rather broad, white: stipe cylindric, slender, hollow, white, glabrous,
mycelioid at the base, 1.5-3 cm. long, 0.5-1 mm. thick.
"Type collected in soil, probably attached to buried wood, on the
bank of Madera Creek, near Stanford University, California, December 21, 1902, James McMurphy 51 (herb. N. Y. Bot. Gard.).
"Distribution: Known only from the type locality."
As previously stated (Smith, 1938), the spores of the type measure
12-16 X 7-8, and are hyaline in iodine. No cystidia were found.
This species appears to be distinct from M. subimmaculata because
of its much broader spores borne on four-spored basidia.
25. Mycena albidula (Pk.), comb. nov.
Omphalia albidula Peck, Ann. Rep. New York State Mus., 49: 17. 1896.
Omphalopsis albidula Murrill, North Am. Flora, 9: 312. 1916.