North American species of Mycena.

EUMYCENA: LACTIPEDES

135

53. Mycena cayugaensis, sp. nov.
Pileus 5-10 mm. latus, saepe 10 mm. altus, campanulatus vel
convexus, striatus, griseus; lamellae angustae, subdistantes, adnatae,
pallidae; stipes 4-6 cm. longus, 1.5-2 mm. crassus, laevis, cavus,
concolor vel pallidus; sucus albus, non copiosus; sporae 9.5-11 X
5-6 g, ellipsoideae; cheilocystidia subventricosa, 40-50 X 10-19 /.
Specimen typicum in Atk. Herb., Cornell Univ., conservatum. Legit
G. F. Atkinson, n. 15131, prope Ithaca, N. Y., June 24, 1903.
Pileus 5-10 mm. broad and nearly as high, campanulate to convex,
thin, striate toward the margin, gray; lamellae narrow, subdistant,
adnate, whitish; stipe 4-6 cm. long, 1.5-2 mm. thick, smooth, hollow,
when broken exuding a whitish juice, concolorous with the pileus or
paler above, base with spreading mycelium.
Spores 9.5-11 X 5-6 u, ellipsoid; basidia 25-30 X 9-12 u, fourspored; pleurocystidia not differentiated; cheilocystidia subventricose
at the base, 40-50 X 10-12,, apices acute.
Habit, habitat, and distribution.-Gregarious to scattered on leaf
mold. Known only from the region around Ithaca, New York, collected by Atkinson and Kauffman.
Observations.-The description has been compiled from Atkinson's
notes on collection 15131 and from studies of its microscopic characters. Unfortunately, I did not obtain iodine reactions at the time
I studied the specimens. The distinguishing characters are the lack
of pleurocystidia and the presence of the white latex in the stipe.
Atkinson had studied two collections (15131 and 15152) and had
tentatively placed them in M. galopus. Since this species is universally interpreted as having large, conspicuous pleurocystidia and
since the abundant material which I have examined has been constant in this character, I believe I am justified in describing the
Ithaca collections as a distinct species.
54. MYCENA ERUBESCENS von Hohnel
Fragm. zur Myk., XV, 794: 967. 1913
Mycenafellea Lange, Dansk Bot. Arkiv, 1 (5): 26. 1914.
Mycena cholea A. H. Smith, Mycologia, 26: 306. 1934.
Illustrations:
Plates 10 C, 12; Text fig. 11, nos. 3, 5 (p. 129).
Beardslee and Coker, Journ. Elisha Mitchell Sci. Soc., 40, pl. 26 (upper
right as M. fellea).