North American species of Mycena.

334 NORTH AMERICAN SPECIES OF MYCENA

This is the species reported under the name "M. rugosa" (Smith,
1935). At the present time it seems that both M. rugosa and M.
parabolica are not clearly understood in Europe. It might, indeed,
be best to drop both names, since the accounts of various workers disagree. Ktihner (1938) does not recognize either one. My earlier
identification of M. rugosa was based largely on Rea (1922) and on
Cooke's figure, which he cites. The tough consistency emphasized by
Fries was disregarded because the specimens in hand appeared to be
of about the same consistency as M. inclinata-and M. inclinata and
M. galericulata have frequently been confused in both Europe and
America. After continued study of M. parabolica it became apparent
that its consistency usually approaches that of M. stannea more
closely than that of M. galericulata. The study of additional collections also sheds more light on the characteristics of the cheilocystidia.
In the form first identified as M. rugosa the cystidia ordinarily were
provided with fingerlike prolongations, whereas in Kauffman's specimens my first examinations indicated that in his M. parabolica the
tendency was more toward the smooth type. Continued study of
fresh material, as it became available, showed this difference to be
more apparent than real, and I now regard it as a variation within
the species and am placing all my collections under M. parabolica
sensu Kauffman. In my estimation this concept is very closely in
line with that of Fries. At the time Kauffman published his account
he did not have a clear idea of what constituted a cystidium, and his
remark stating that the cystidia were sometimes found on the edge
of the gills but that sterile cells were lacking must be disregarded.
Cheilocystidia as given in the description are present in his specimens.
163. Mycena rubrotincta, nom. nov.
Mycena tenuicula Murrill, Mycologia, 8: 221. 1916 (not M. tenuicula Karsten
in Saccardo, 14: 84. 1899).
Prunulus tenuicula Murrill, North Am. Flora, 9: 334. 1916.
Illustrations:
Plate 76; Text fig. 42, nos. 3, 5 (p. 330).
Smith, Am. Journ. Bot., 22, pl. 1, fig. 3.
Pileus 5-20 (30) mm. broad, very obtusely conic, convex, or with
the apex flattened and the sides nearly parallel, becoming broadly
convex to plane in age, at times with a broad umbo, margin appressed
against the stipe at first, spreading in age, surface pruinose but soon