North American species of Mycena.

EUMYCENA: TYPICAE

345

a tendency to remain smooth, as do those of M. pseudoinclinata.
It is not so pronounced as in that species, however. From M. hemisphaerica, M. occidentalis is separated with more difficulty. The
cheilocystidia seem to be fairly distinctive, however, as shown in the
text figures. In M. occidentalis they are much more difficult to find,
and may at times be mostly smooth and clavate to fusoid-ventricose.
In M. hemisphaerica they are regularly more echinulate. There are
also differences in stature, colors, and manner of growth. At first I
was inclined to regard both M. maculata and M. occidentalis as varieties of M. hemisphaerica, but, in view of the emphasis given to the
markings of the cheilocystidia in this work, they have been retained
as distinct species.
169. MYCENA HEMISPHAERICA Peck
Ann. Rep. New York State Mus., 46: 104 (24). 1893
Mycena atroumbonata Peck, Bull. New York State Mus., 157: 29. 1912.
Prunulus hemisphaericus Murrill, North Am. Flora, 9: 329. 1916.
Prunulus subtenuipes Murrill, ibid., p. 334.
Prunulusfuliginosus Murrill, ibid., p. 335.
Prunulus atroumbonatus Murrill, ibid.
Mycena fuliginosa Murrill, Mycologia, 8: 220. 1916.
Mycena subtenuipes Murrill, ibid., p. 220.
Mycena tenacipes Kauffman and Smith, Pap. Mich. Acad. Sci., Arts, and
Letters, 17: 185. 1933.
Illustrations:
Plate 82; Text fig. 41, nos. 9-10 (p. 328).
Lange, Flora Agar. Dan., 2, pl. 56 D (as M. parabolica).
McDougal, Mushrooms, plate opposite p. 104 (as M. galericulata).
Smith, Am. Journ. Bot., 22, pl. 4, fig. 5
Pileus 1-5 cm. broad, conic, obtuse or acorn-shaped at first, sometimes convex, becoming irregularly campanulate; conic with a flaring
margin, broadly convex or plane, and more or less umbonate, shape
variable, margin appressed against the stipe when young and often
flaring or recurved in age, surface often hoary at first, soon polished,
very finely radially wrinkled-striate, moist but opaque when young,
becoming translucent-striate before fading, subhygrophanous, nearly
black or "fuscous" to "bister" when young, becoming "wood brown"
to "avellaneous," finally fading to sordid grayish or grayish brown
toward the margin, the disc frequently remaining darker (often black