North American species of Mycena.

396 NORTH AMERICAN SPECIES OF MYCENA

stumps and logs in northeastern North America, extends south into
the Great Smoky Mountains of North Carolina and Tennessee. An
interesting parallel situation is found in M. haematopus. In that
species a variety with marginate gills exists in addition to the typical
variety, but their taxonomic ranking has been reversed, the nonmarginate fruiting bodies being classed as typical and those that have
marginate gills as the variety. Peck described a variety laevidisca
under 0. rugosodisca, but it does not deserve taxonomic recognition.
I have found it on fir stumps, and the cap may be either smooth,
slightly rugose, or distinctly rugose on carpophores in a single group.
200. MYCENA BREVIPES Murrill
Mycologia, 8: 220. 1916
Prunulus brevipes Murrill, North Am. Flora, 9: 328. 1916.
Illustrations: Text fig. 47, nos. 2-3 (p. 387).
"Pileus conic to convex, not umbonate, solitary, 8 mm. broad;
surface dry, glabrous, pale-gray, striate, margin pallid, entire, appressed when young: lamellae adnexed or nearly free, crowded,
narrow, broader near the margin, white: stipe very short for the
genus, slightly tapering downward, smooth, dry, glabrous, white,
attached to the substratum by a broad, circular mat of white mycelium, scarcely 1 cm. long, 1-2 mm. thick."
Habit, habitat, and distribution.-Single on hardwood sticks;
Tennessee.
Observations.-Upon reexamining the type I obtained the following
data: The spores measure 7-9 X 5-6 y, are broadly ellipsoid, and
definitely amyloid. Pleurocystidia and cheilocystidia were found
to be fairly abundant, but nearly all were so badly collapsed that they
could very easily be overlooked in mounts of revived material. KOH
revived them better than any lactic-acid solution, and a careful study
of the sections mounted in KOH and stained with phloxine showed
the cystidia to be fusoid-ventricose, smooth, and about 35-50 X
8-13,. The cystidia illustrated in text figure 47, no. 3, are cameralucida drawings of the more nearly normal individuals. The basidia
revive very well; they measure 24-28 X 7-8u and are four-spored.
The pileus trama consists of a thin pellicle and a tramal body apparently made up almost entirely of metallic-appearing lactiferous
hyphae 4-9, thick. Sections of the pellicle were not good, and no