North American species of Mycena.

EUMYCENA: CALODONTES

collection found under white pine, September 8, 1934; Warrensburg,
New York.
Material studied.-Smith, 733.
Observations.-The dried specimens have a vinaceous rather than
a yellowish cast, and in this respect the species resembles M. capillaripes more closely than M. citrinomarginata. The lack of pleurocystidia and the larger spores readily separated it from the former,
and the reddish gill edges from the latter, although I am inclined to
believe it intergrades with M. citrinomarginata.
103. Mycena cheboyganensis, sp. nov.
Illustrations: Text fig. 24, nos. 6-7 (p. 216)
Pileus 5-15 mm. latus, late conico-campanulatus vel convexoumbonatus, sulcatus, fuscus demum griseus; lamellae latae, subdistantes, late adnatae, albidae vel griseae, rubro-marginatae; stipes
3-8 cm. longus, 1-2 mm. crassus, aequalis, fragillissimus, glaber,
griseus; sporae (10) 11-14 X 6-8,; basidia tetraspora; pleurocystidia
et cheilocystidia similia, subventricosa vel subcylindrica, 40-65 X 6-9,.
Specimen typicum in Herb. Univ. Mich. conservatum. Legit A. H.
Smith, n. 32-92, prope Rees's Bog, Cheboygan Co., Mich., June 6,
1932.
Pileus 5-15 mm. broad, broadly conico-campanulate to convex
or umbonate, umbo blunt but abrupt, margin appressed at first,
surface moist, soon dry, and in the faded condition appearing finely
appressed-fibrillose under a lens (10X), sulcate-striate to the umbo,
fuscous on the disc and along the striations, paler toward the margin
and in the interspaces, pale grayish over all when faded except for the
reddish-brown margin, margin not incised or lobed; flesh thin, pallid,
fragile, no color change noted when bruised, odor and taste not recorded; lamellae broad, subdistant to distant, broadly adnate and
decurrent by a line, white to grayish with dark reddish-brown edges;
stipe 3-8 cm. long, 1-2 mm. thick, equal, fragile, hollow, apex pruinose
but soon polished, base white-mycelioid, pale gray to pallid.
Spores (10) 11-14 X 6-8,, smooth, ovoid to subpyriform, amyloid; basidia four-spored; pleurocystidia rare to scattered, 40-60 X
6-9 1, subventricose to subfiliform, the apices occasionally forked,
hyaline; cheilocystidia very abundant and similar to pleurocystidia,
gill edge with the coloring matter apparently not located in the
cystidia (its position was not ascertained at the time the fresh speci