North American species of Mycena.

178 NORTH AMERICAN SPECIES OF MYCENA

tribution of a rather large number of alpine plants in the Olympic
Peninsula of Washington. As the species is recognized here, it differs
from the M. amabilissima group in becoming bright yellow as it fades
instead of merely a very pale weak yellow or white. In their brilliance the colors of M. adonis remind one of those of M. acicula, M.
oregonensis, and M. strobilinoides, but there appears to be no close
relationship to any of these. Ktihner lists M. rubella Quelet sensu
Boudier, Icones, pl. 68, as a synonym of M. adonis. Boudier's fungus
had two-spored basidia and spores 10-12 X 3.7-5.7 A. Kiihner's
concept of M. adonis thus applies to rose-colored forms here treated
under the names M. roseocandida and M. amabilissima.
81. MYCENA ROSEOCANDIDA (Pk.) Bull. Saccardo
Syll. Fung., 5: 262. 1887
Agaricus (Mycena) roseocandidus Peck, Bull. Buffalo Soc. Nat. Sci., 1:47.
1873.
Prunulus roseocandida Murrill, North Am. Flora, 9: 323. 1916.
Illustrations:
Plate 11 B.
Beardslee and Coker, Journ. Elisha Mitchell Sci. Soc., 40, pl. 19 (as M.
amabillissima).
"Pileus convex or broadly campanulate, subpapillate, striate
nearly to the apex, white or rosy-red; lamellae close, uncinate, colored
like the pileus; stem slender, smooth, white.
"Plant 2" high, pileus 4"-6" broad.
"Among mosses in woods. Adirondack Mountains. July.
"Usually the whole plant is pure white, but sometimes the pileus
has a delicate rosy hue except on the apex and the margin. The
striations of the pileus remain in the dried specimens. The papilla
is sometimes very prominent, sometimes wanting."
Peck's original description is quoted. I have examined the type
but found very few spores. Those seen were attached to sterigmata,
measured 4.5-5.5 X 3-4 u, and were broadly ellipsoid. Other spores
scattered in the mount measured 6-7 X 4 y. Because of their scarcity
not much reliance can be placed on the spore size as obtained from the
type. More than likely, spores from a deposit would have been larger
than any of those found in my mounts. Pleurocystidia and cheilocystidia are similar and fairly abundant. On the faces of the gills
two kinds were observed: (1) In one they were typically fusoid