North American species of Mycena.

420 NORTH AMERICAN SPECIES OF MYCENA

32-36 X 7-8 g, four-spored; cheilocystidia 30-60 X 6-11 A, hyaline,
clavate at first but soon fusoid, with one to four long needlelike projections 15-30 u long and 2-3,u thick, the projections simple or forked,
the enlarged portion of the cystidium sometimes covered with obtuse
irregular protuberances in addition to the needlelike projections (a
few cheilocystidia are clavate and more or less contorted); no pleurocystidia; gill trama floccose and faintly brownish in iodine, subhymenium not gelatinous, gill edges gelatinizing; pileus trama with a
thick gelatinous separable pellicle, the remainder of the tissue not
appreciably differentiated, floccose and brownish in iodine; stipe with
a gelatinous outer layer, the inner tissue vinaceous red in iodine.
Habit, habitat, and distribution.-Gregarious to scattered in oak or
pine woods; Tennessee, Michigan, Oregon, and California in the
United States and Quebec in Canada. It occurs either at low elevations in the fall of near melting snowbanks in the mountains in the
summer.
Material studied.-Smith, 6159, 6165, 15498, 15516, November 18,
1931, Michigan. W. B. Cooke, 1557. 0. E. Fischer, October 16,
1905, Detroit (determined as "M. epipterygia form A" by Kauffman).
Grove, F 9719 (collected by Drayton), Quebec. Hesler, 13164.
Observations.-The cheilocystidia are the most distinctive character of the species, and they separate it at once from M. epipterygioides Pearson. There are also differences in the colors and the
manner in which they change, but in view of the great variation of
yellow, green, and gray in this group, I hesitate to emphasize them.
One of two specimens of M. viscosa sent to me by Dr. Rolf Singer has
cheilocystidia like those of M. griseoviridis; the other, like those of
M. epipterygia. In the American collections this difference has been
found constant, and serves to distinguish readily both M. griseoviridis
and M. epipterygia. On the basis of Singer's specimen, M. griseoviridis may be said to occur in Europe also. Kauffman's M. epipterygia var. A also belongs here, but his specimens blackened in drying
and now are not typical in their appearance.
214. MYCENA GRISEOVIRIDIS var. cascadensis, var. nov.
Pileus 8-15 mm. latus, obtuse conicus demum campanulatus,
striatus, viscidus, luteo-griseus vel luteo-brunneus, demum sordide
luteus; lamellae pallide luteae, subdistantes, adnatae, angustae;
stipes 1-3 cm. longus, 1-1.5 mm. crassus, laete luteus, viscidus;
sporae 8-10 X 5-7; cheilocystidia aciculata vel subventricosa,