North American species of Mycena.

198 NORTH AMERICAN SPECIES OF MYCENA

of the gills in both species have the characteristic orange content,
and in both the cystidia on the gill edge have brighter contents than
those on the sides, which indicates that the gill edges were brightly
colored. This, along with Murrill's description of the pileus, suggests that he had in hand faded specimens of M. strobilinoides when
he described M. aurantiaca. One of the outstanding features of
M. strobilinoides is that it does not change color noticeably in drying,
a character Murrill also observed in his M. aurantiaca. The brightred color of the young pilei fades slowly, and in age the entire plant is
usually a brilliant yellow. In the vicinity of Chain Lakes, Mt.
Baker, Washington, however, carpophores were found which had
faded to almost pure white. In such faded specimens the gill edges
are bright or pale yellow rather than red.
Mycena strobilinoides is most abundant at elevations of 2,500 feet
or more in the mountains. It fruits more abundantly under pine
than under other conifers but is not restricted in its habitat. Mains
found the most luxuriant specimens I have yet seen under red pine
on the south shore of Lake Superior near Marquette, Michigan.
Kauffman (1926) did not regard the echinulate-sterile structures
in the hymenium of this species as cystidia and confused them with
paraphyses. As is now known, there is no sharp distinction between
the smooth and the roughened types of cystidia in the genus as a
whole. Nearly all possible combinations of both are represented,
and both are correctly termed cystidia.
91. MYCENA AURANTIOMARGINATA (Fr.) Quelet
Champ. Jura et Vosges, p. 240. 1872
Agaricus (Mycena) aurantio-marginatus Fries, Syst. Myc., 1: 113. 1821.
Illustrations:
Plates 26 A, 27; Text fig. 20, nos. 6-7 (p. 194).
Bresadola, Icon. Mycol., 5, 221, fig. 1.
Konrad et Maublanc, Icon. Sel. Fung., 3, pl. 222.
Lange, Flora Agar. Dan., 2, pl. 54 G (as M. elegans).
Ricken, Die Blatterpilze, 2, pl. 110, fig. 5.
Pileus 8-20 mm. broad, obtusely conic to campanulate, becoming
nearly plane in age, faintly hoary-pruinose at first but soon polished,
lubricous, color when moist dark olive fuscous on the disc and the
marginal area bright orange shaded with fuscous, sometimes the disc
"orange citrine" to "medal bronze" (yellowish olive) and the margin
"cadmium orange" (brilliant orange), striate, not hygrophanous,