North American species of Mycena.

EUMYCENA: HYDROPUS

393

species, but an examination of the figure leads me to believe it represents M. haematopus instead.
Material studied.-Atkinson, 15370, 24187 (as M. atramentosa);
six packets (as M. succosa), 2418, 2896, 4594, 5334, 13392, 13499.
Hesler:, 6521. Kauffman, Michigan (as M. succosa).
197. MYCENA TAXODII Murrill
Bull. Torr. Bot. Club, 67: 235. 1940
Prunulus taxodii Murrill, ibid., p. 234.
"Pileus conic to broadly convex, often slightly umbilicate or truncate, cespitose or closely gregarious, 1-1.5 cm. broad; surface glabrous,
black when young, umbrinous or fumosous in the older stages, distinctly sulcate-striate to the small central disk, which is very rugose;
margin straight, entire, paler; context very thin, blackish, mild, odorless; lamellae adnate, broad, ventricose, inserted, distant, interveined,
entire cinereous, blackish near the context, blackening when bruised
but not bleeding; spores irregular, subglobose to ellipsoid, smooth,
hyaline, granular, 4-6 X 3-4 u; stipe equal, smooth, glabrous, whitishshaggy at the base, blackish to avellaneous, not bleeding, about
3 X 0.1 cm.
"Type collected by W. A. Murrill on the base of dead standing
trunks of pond cypress in a cypress bog near Orange Heights, Alachua
Co., Fla., Nov. 9, 1938 (F 18376). The trees were killed by a grass
fire during a drought. So far as I now remember, these are the first
specimens of Mycena to be reported on Taxodium in America. Their
color is quite peculiar; while the fresh spores suggest dried English
peas."
Dr. Murrill sent me a portion of the type for microscopic study.
The spores are amyloid, 9-11 X 5-6,, ellipsoid, smooth, and hyaline.
The content is frequently granular and organized into an irregular
body. When stained, the thin outer wall is clearly visible; in unstained mounts in KOH it usually stands out very clearly. Cheilocystidia are abundant and are intermediate between the clavateroughened and the fusoid types. Ordinarily they have two to four
obtuse contorted projections arising from the apex, but typical
clavate-roughened individuals as well as of some that are fusoidventricose were noted. No pleurocystidia were seen. The tramae
of the gills and pileus were nonamyloid and not otherwise distinctive.