North American species of Mycena.

EUMYCENA: CALODONTES

213

United States it extends south in the mountains to North Carolina
and Tennessee.
Material studied.-Smith, 33-195, 33-342, 33-439, 33-916, 33-973,
712, 725, 749, 756, 915, 1063, 1136, 2492, 4815, 4864, 4906, 7370, 7824,
8773, 9760, 14887, 16509. Davidson, 210. Kauffman, New York,
Michigan, Oregon.
Observations.-This is typically a gray Mycena that may occasionally become whitish. Its habitat, the bright to dull reddish-brown
gill edges, and the large spores on four-spored basidia, as well as
the fusoid cheilocystidia, distinguish it. Kiuhner groups it along
with M. luteoalcalina, M. atromarginata, M. purpureofusca, and M.
viridimarginata. M. rubromarginata differs from the species named
above by the characters used in the key. There is a wide range of
variation in the color of the gill edges, but reddish brown is always
dominant in contrast to rose, purplish, or olive tones in the other
species.
In northern Michigan I found on an alder stick near the Big
Garlic River a perfect carpophore (33-439, June 13, 1933) which
appears to be intermediate between M. rubromarginata and M. viridimarginata. The gills were thick, distinctly veined, and glaucous
grayish green. After standing overnight they had changed to brownish olive, but the edges were still dull red. The pileus was 1 cm.
broad, bister in color, and scarcely faded. The spores measured
10-12 X 5-6 A, the basidia were four-spored, and the cheilocystidia
were fusoid-ventricose. They measured 38-43 X 9-14 M and had
a dark-red homogeneous content. I have not found more like it,
and I include it here as a chance variation which appears to be intermediate between M. rubromarginata and M. viridimarginata.
98. MYCENA VIRIDIMARGINATA Karsten
Hedwigia, 31: 218. 1892
Pileus 8-14 mm. broad, broadly conic to convex, the margin
appressed at first, broadly umbonate in age, surface glabrous and
moist, hygrophanous, dark watery gray to avellaneous or with a
sordid-olivaceous cast on the disc, fading to sordid gray or with an
obscure vinaceous tint near the margin, sometimes yellowish gray
when faded, striate when moist, becoming slightly sulcate; flesh soft
and fragile, odor and taste none; lamellae adnate, at times with a