North American species of Mycena.

EUMYCENA: HYDROPUS

397

details could be made out. The tramal body revived well, as one
would expect. The gill trama was also filled with "metallic" lactiferous hyphae, although some floccose tissue was visible. The trama
of both the pileus and the gills remained yellow in iodine.
When I first examined the type, the only stained preparations
made were in lactic acid. Because of the clearing action of the acid,
in addition to its failure to revive the pleurocystidia, I overlooked the
pleurocystidia in that examination, and the significance of the structure of the pileus escaped me. As a result, I misdetermined a group
of collections from the western United States and published (1937)
an account of them under Murrill's name. For further data on these
collections see M. subcana (p. 75). So far as is now known, M. brevipes should be recognizable by its cap trama, cystidia, and
spores. It remains to be ascertained whether or not a colored latex
is present in fresh specimens. Since none was noted, the specimens
have been placed here provisionally.
201. MYCENA SERIFLUA Murrill
Bull. Torr. Bot. Club, 66: 37. 1939
Galactopus serifluus Murrill, ibid., p. 32.
"Pileus convex to subexpanded, umbilicate, gregarious, 1.5 cm.
broad; surface smooth, glabrous, opaque, melleous, blackish at the
center; margin incurved, even, entire; context rather thick, opaque,
pallid, odorless, somewhat mawkish, bleeding watery drops when
cut; lamellae adnate with a small decurrent tooth, medium distant,
broad behind, inserted, entire, white, unchanging; spores ovoid,
smooth, hyaline, 1-guttulate, about 3 X 2 A; cystidia none; stipe
equal, smooth, pallid and pruinose above, subconcolorous and subglabrous below, whitish-tomentose at the base, 2 X 0.2 cm.
"Type collected by W. A. Murrill on a rotten magnolia log in a
hammock at Gainesville, Fla., Sept. 14, 1938 (F 18104). An aberrant
species with incurved margin like Gymnopus and bleeding from the
context more than from other parts of the hymenophore. Dried
specimens would be referred to Gymnopus without hesitation. Galactopus rugosodiscus (Peck) Murr. is probably its nearest relative."
The original account is here quoted. I have examined a portion
of the type and found the spores to be distinctly amyloid and to
measure 4-5 (6) X 3-3.5 pt. They are smooth and broadly ellipsoid.