North American species of Mycena.

EUMYCENA: ADONIDAE

193

the apex of the stipe. There is a great deal of variation in size and
color of the pileus in both, and the length of the spores varies, so that
it alone is not an accurate distinction. One's first impression of these
two is very likely to lead to the conclusion that a single variable
species is all that should be recognized. I was of this opinion until
1938, when both fruited in great abundance in the vicinity of Ann
Arbor. They were constant in the characters as given above. M.
rutilantiformis appears to be much more common in North America
than M. pelianthina, most reports of which in the literature very
likely apply to the former species. I know from field experience with
Kauffman that he did not distinguish between them, but that he was
dissatisfied with the species concept he had at the time. The report
of M. pelianthina by Kauffman and Smith from Rock River, Michigan, is based on specimens of M. rutilantiformis.
89. MYCENA RUTILANTIFORMIS Murrill
Mycologia, 8: 221. 1916
Mycena dentitulata Peck, Bull. Torr. Bot. Club, 32: 77. 1905 (not M. denticulata /Qu'let, 1888).
Prunulus rutitantiformis Murrill, North Am. Flora, 9: 334. 1916.
Mycena pseudopelianthina Lange, Mycologia, 26: 9. 1934.
Illustrations:
Text fig. 20, nos. 1-2 (p. 194).
Smith, Mycologia, 31, fig. 1 p.
Pileus (1.2) 2-7 cm. broad, convex, becoming broadly convex or in
age at times with an elevated wavy margin, margin connivent with the
stipe in young stages and frequently splitting in age, glabrous, striatulate when moist, surface moist and lubricous, hygrophanous,
"Natal brown" to "deep brownish drab" and fading to near "avellaneous" or "vinaceous buff," often paler and with a sordid yellowish
cast, sordid purplish tints often persistent; flesh moderately thick,
yellowish to whitish, usually whitish in age, cuticle vinaceous in section, odor resembling that of radishes, taste similar or bitter and
scarcely radishlike; lamellae adnate but becoming sinuate to adnexed,
seceding, close to subdistant, 30-38 reach the stipe, broad (1 cm. i),
intervenose, edges eroded and sordid reddish purple, faces "vinaceous
fawn" or paler; stipe 3-8 cm. long, (3) 5-10 mm. thick, hollow, equal
or base enlarged, somewhat longitudinally sulcate-striate, with
scattered appressed purplish fibrils above, sometimes lacerate-scaly