North American species of Mycena.

128 NORTH AMERICAN SPECIES OF MYCENA

branched into two to several fingerlike prolongations above the inflated basal portion, 36-50 (80) X 9-14 u, gill trama pale yellowish
in iodine; pileus trama with a thin adnate pellicle, beneath it a region
of slightly inflated cells, the remainder filamentous and floccose, all
parts pale yellowish to yellowish brown in iodine.
Habit, habitat, and distribution.-More or less decumbent and
densely gregarious on mossy logs, summer and fall. It was found on
redwood logs in California and is known also from Tennessee, New
York, Alabama, and Michigan, where it was collected on old logs of
both hardwoods and conifers.
Material studied.-Smith, 33-375, 33-688, 33-719, 3782. Burke,
Alabama, 1942. Hesler, 10154, Tennessee; no number, 1934.
Observations.-M. supina has the consistency and stature of M.
subsupina, but the latter's cystidia distinguish it at once. In addition, the spores are ellipsoid rather than globose. Those of M. supina
are globose to subglobose and vary to ellipsoid on two-spored forms.
The spores of two-spored forms of M. subsupina vary to globose or
subglobose. Their bluish reaction in iodine is very distinct.
Mycena subcucullata is readily distinguished from M. subsupina
by its smaller cheilocystidia, thinner stipe, and weak amyloid reaction (if there is any) of its spores. There is also a distinct difference
in spore size if only the four-spored forms of both are compared.
I have collected a number of specimens in Michigan and New
York which seem to belong here but are characterized by rather
abundant pleurocystidia. In some of these the pileus was quite
rugose, but the character did not appear to be constant. Their
basidia were mostly two-spored (33-719, 33-688 from Michigan), and
the spores measured 9-12 X 6-7.5,i. In 782, from Warrensburg,
New York, the spores measured 7-9 X 4-5 (6) u; they were produced
on four-spored basidia. These forms need further study.
50. MYCENA CORTICATICEPS Kauffman & Smith
Pap. Mich. Acad. Sci., Arts and Letters, 17: 180. 1933
Illustrations: Text fig. 11, nos. 1-2.
Pileus 2-4 mm. broad, sharply conic to campanulate, broadly
expanded and with a subpapillate umbo at maturity, margin appressed against the stipe when young, flaring in age, surface glabrous,
moist, translucent-striate, becoming opaque, color grayish vinaceous