North American species of Mycena.

EUMYCENA: OMPHALIARIAE

361

175. Mycena pallida (Murr.), comb. nov.
Omphalopsis pallida Murrill, Mycologia, 9: 41. 1917.
Mycena phaeophylla Kuhner, Encyc. Myc., 10: 590. 1938.
"Pileus conic to convex, becoming umbilicate, gregarious, 1.5 cm.
broad; surface dry, smooth, minutely silky, not striate, pallid, paleavellaneous on the disk; lamellae decurrent, especially when young,
arcuate, distant, broad, white; spores ellipsoid, smooth, hyaline,
7-8.5 X 4-5 i; stipe very slender, cartilaginous, equal, smooth,
hyaline, white, 2-3 cm. long, 1 mm. thick.
"Type collected in soil on a roadside bank at Lake Placid, Adirondack Mountains, New York, October 3-14, 1912, W. A. & Edna L.
Murrill 1093 (herb. N. Y. Bot. Gard.)."
Observations.-The spores of the type are as Murrill described
them. They are nonamyloid. Cheilocystidia are rare, 26-38 X
7-10 u, and more or less cylindric to saccate. They have thin walls
and a hyaline content. The basidia are four-spored, and no pleurocystidia were seen. The gill trama is compact and of narrow interwoven hyphae 5-8, in diameter. The pileus trama is homogeneous
beneath a slightly differentiated pellicle, from which numerous filamentous hyphae project to produce the minutely silky appearance
mentioned by Murrill. The trama of neither the pileus nor the gills
is amyloid.
The apparent discrepancy in the color of the gills in the descriptions of Murrill and Kiihner is doubtless insignificant. In other
similarly colored agarics the gill color frequently varies from whitish
to dark gray or brownish gray. The nonamyloid spores, stature, and
hairs over the surface of the pileus, along with the smooth cheilocystidia, are the important diagnostic characters. Mycena serotina
is distinguished by the well-developed pellicle, the hyphae of which
lack the projections found in M. pallida. At the time Kiihner was
completing his work I had not examined the type of 0. pallida.
176. Mycena thujina, sp. nov.
Illustrations: Plate 86 D; Text fig. 45, nos. 9-10 (p. 377).
Pileus 5-15 mm. latus, convexus vel late convexus, pruinosus dein
glaber, subhygrophanus, umbrino-brunneus demum cinnamomeus;
lamellae subdistantes, arcuatae vel dente decurrentes, angustae; stipes
(2) 3-7 cm. longus, 1-1.5 mm. crassus, cartilagineus, glaber, sordide
brunneus; sporae 5-7 X 5-6 p, nonamyloideae; cheilocystidia 28-40