North American species of Mycena.

EUMYCENA: ADONIDAE

191

whitish, fairly crowded with a faint reflection of lilac, horizontal and
decurrent by a tooth, the edge arcuate-concave and not ventricose,
always broadly adnate, slightly interveined; stipe 3-6 cm. long, 1.2 -2.5 mm. thick, subequal or weakly attenuated from the base upward,
with long white rhizoids penetrating the humus, concolorous with the
pileus, shining, polished, glabrous (the apex may be faintly pruinose),
hollow.
Spores elliptic, 5-7.5 X 2.5-4.5,, nonamyloid; basidia fourspored; cheilocystidia abundant, 50-70 X 9-15 u, very obtuse, clavate
to cylindric, smooth, hyaline; gill trama amyloid; pileus trama with a
thin pellicle, a hypoderm and a filamentous tramal body, all but the
pellicle strongly amyloid.
Although I have seen about all the variations described for M. pura
and have observed many more, forms with the gills attached, as in
my 11035, have not been among them. In their bearing the fruiting
bodies, with their turbinate caps and decurrent gills, remind one of
small carpophores of Hygrophorus pratensis.
Bisby's collection from Lac du Bonnel in Manitoba, September 9,
1935, is the same as my Michigan collection. The iodine reactions
are the same, with the spores very distinctly amyloid. In his notes
Bisby described the pileus as watery-brown-striate, then yellowish,
and with a trace of pink. The lamellae were lavender pink and
broadly adnate or decurrent by lines. The stipe was translucent
whitish.
Kiihner's interpretation of M. pseudopura does not appear justified. There is nothing in Cooke's original description to indicate
that his species had broadly arcuate to subdecurrent gills. He described them as merely adnate. Rea and others have placed Cooke's
fungus in synonymy with M. pura, considering it a color variation.
88. MYCENA PELIANTHINA (Fr.) Quelet
Champ. Jura et Vosges, p. 102. 1872
Agaricus pelianthinus Fries, Syst. Myc., 1: 112. 1821.
Prunulus denticulatus S. F. Gray, Nat. Arr. Brit. Plants, 1:630. 1821 (see
Murrill, North Am. Flora, 9: 332. 1916).
Illustrations:
Plate 25; Text fig. 19, nos. 3-4 (p. 188).
Beardslee and Coker, Journ. Elisha Mitchell Sci. Soc., 40, pl. 13.
Bresadola, Icon. Mycol., 5, pl. 220.
Konrad et Maublanc, Icon. Sel. Fung., 3, pl. 223.