North American species of Mycena.

366 NORTH AMERICAN SPECIES OF MYCENA

Spores 8-10 (12) X 5-6 (7) A, ellipsoid, smooth, hyaline, amyloid;
basidia four-spored; pleurocystidia not differentiated; cheilocystidia
basidium-like at first; in age some developing short projections or the
walls becoming quite irregular in outline, hyaline, embedded; gill
trama homogeneous, vinaceous brown in iodine, subhymenium not
gelatinous; pileus trama with a thin nongelatinous pellicle, a welldifferentiated hypoderm, the cells of which have a sordid-brown content, a wide band (70-150 j,) of moderately broad hyphae, which are
distinctly gelatinous, occurring beneath the hypoderm, and the remainder of the flesh (100-200 j thick) made up of floccose filamentous
hyphae, subhymenium not gelatinous, all but the pellicle and gelatinous portion vinaceous brown in iodine.
Habit, habitat, and distribution.-Scattered on a lawn; November
6, 1937, Darlingtonia, Smith River Canyon, Siskiyou National Forest,
California, A. H. Smith, 8465. Known only from the type locality.
Observations.-This is a most curious species. The large cap and
short stipe make it appear very top-heavy. In color it is indistinguishable from M. concolor or M. misera, but is readily separated
from both by the gelatinous layer beneath the hypoderm of the pileus.
There is also a distinct difference in the cheilocystidia. Those of
M. subconcolor are scarcely differentiated from the basidia, or often
have only four contorted projections, which one might possibly mistake for sterigmata. The mild taste of M. subconcolor serves to
distinguish it from M. cinerella, as do the smaller cheilocystidia and
the gelatinous layer in the pileus.
180. MYCENA CINERELLA Karsten
Rysslands Finlands och den Skandinaviska Halfons
Hattsvampar, p. 113. 1879
Agaricus (Mycena) cinerellus Karsten, Hedwigia, 18: 22. 1879.
Illustrations:
Plate 86 C; Text fig. 45, nos. 7-8 (p. 377).
Lange, Flora Agar. Dan., 2, pl. 61 H.
Smith, Mycologia, 28, fig. 1, no. 1 (small carpophores).
Pileus (3) 8-15 (25) mm. broad, obtusely conic to convex, in age
often broadly umbonate, the umbo usually somewhat flattened, surface glabrous and moist, lubricous margin appressed against the stipe
at first, entire or becoming notched in age and sometimes crenate,
translucent-striate, color dark watery gray to pale watery gray,