North American species of Mycena.

GLUTINIPES: CAESPITOSAE

415

Spores 6-7 X 3-3.5 u, smooth, subellipsoid, nonamyloid; basidia
four-spored; pleurocystidia and cheilocystidia not differentiated; gill
edges not gelatinous; gill trama of a mixture of inflated thin-walled
hyphal cells and numerous long, narrow contorted lactifers, subhymenium very thin, of narrow hyphae; pileus trama with a thick
gelatinous pellicle, the hyphae of which have yellow contents, the
remainder a mixture of floccose hyphae and lactifers, all parts, including the pellicle, reddish brown to more or less vinaceous brown in
iodine.
Habit, habitat, and distribution.-Scattered, gregarious, or subcespitose on decaying wood of balsam, fir, or hemlock; Tennessee,
New York, Michigan, Washington, and Oregon in the United States
and Ontario in Canada. I have found it in both spring and fall,
but it appears to be rather uncommon.
Material studied.-Smith, 33-376, 33-540, 16719, 16862. Gruber,
Oregon. Hesler, 11536. Kauffman, six collections, New York and
Michigan. Kelly, 1206.
Observations.-The carpophores have pallid gills immediately after
being dried, but they often change slowly to yellowish brown. The
pilei and stipes dry a dull yellow. This is a rather anomalous species
by virtue of its gill color, nonamyloid spores, and deep reddish-brown
flesh of the pileus in iodine. The iodine reactions of the flesh of the
pileus are not vinaceous as in other members of this group. The relationships of the species appear to be here rather than in any other
section of Mycena or in any other genus. The decurrent gills, which
caused Peck to place it in Omphalia, cannot be regarded as an important generic character in this instance because many of the viscidstiped Mycenae also have them. Singer (1942) has placed it in
Clitocybe, but it does not appear to be related to the lilac-gilled species
of that genus.
212. MYCENA SUBEPIPTERYGIA Murrill
Bull. Torr. Bot. Club, 67: 235. 1940
Prunulus subepipterygius Murrill, ibid., 233. 1940.
Illustrations: Text fig. 51, nos. 1-2 (p. 416).
"Pileus convex to plane, depressed at the center, gregarious to
cespitose, 1-2 cm. broad; surface slimy-viscid, smooth, glabrous,
sulcate, white, umbrinous on the disk; context membranous, white;
lamellae adnexed, narrow, tapering behind, medium distant, inserted,