North American species of Mycena.

EUMYCENA: CYANESCENTES

63

Washington, Oregon, and California in the United States and in
British Columbia and Ontario in Canada. This apparently is not
an uncommon species along the Pacific coast but is very rare in
northeastern North America.
Material studied.-Smith, 2515, 2525, 2581, 3277, 3330, 3584,
3675, 3703, 3738, 3917, 4762, 7783, 7938, 8178, 8330, 9372, 13062,
13248, 13419, 13516,13594,13656, 13716,13882,13923, 13997, 14476,
16160, 16168, 16298, 16479. Arnold, July 16, 1932; Atkinson, New
York. Three collections as M. Iris, spores 7-11 X 3.5-5 g; Kauffman, two collections, 1925; Wehmeyer, 1922.
Observations.-The synonymy given for this species is taken from
Kiihner (1938). As frequently happens in the case of a variable
species, M. amicta has received many names. A second study of
Murrill's type of M. caesiialba proved the type collection to be a
mixture of two species. The only well-preserved specimen is identical
in every respect with the large lignicolous form of M. amicta. For
additional comments on M. caesiialba see page 474.
The fine pubescence of the stipe, the thick tenacious separable
pellicle of the pileus, the close gills, ellipsoid spores, and narrow cheilocystidia form a group of characters which enable one to identify
specimens that have lost all traces of the bluish or greenish colors.
When the plants are growing on conifer logs and stumps the fruiting
bodies are often quite large and highly colored, but there appear to
be no other characters correlated with these that would serve to distinguish a taxonomic unit.
10. MYCENA SUBCAERULEA (Pk.) Saccardo
Syll. Fung., 5: 263. 1887
Agaricus (Mycena) subcaeruleus Peck, Bull. Buffalo Soc. Nat. Sci., 1: 47. 1873.
Mycena cyaneobasis Peck, Ann. Rep. New York State Mus., 51: 284. 1898.
Mycena cyanothrix Atkinson, Stud. Am. Fungi, p. 98. 1900.
Prunulus cyaneobasis Murrill, North Am. Flora, 9: 323. 1916.
Illustrations:
Plate 4; Text fig. 2, nos. 5, 7 (p. 58).
Atkinson, Stud. Am. Fungi, fig. 99.
Beardslee and Coker, Journ. Elisha Mitchell Sci. Soc., 40, pls. 21-22,
upper figs.
Peck, Ann. Rep. New York State Mus., 51, pl. B, figs. 1-7.
White, Conn. State Geol. and Nat. Hist. Surv. Bull., 3, pl. 7 (as M. cyanothrix).
Pileus (3) 5-15 (25) mm. broad, more or less ovoid with an ap