North American species of Mycena.

108 NORTH AMERICAN SPECIES OF MYCENA

Observations.-As Kiihner has pointed out, the fungus is very
close to M. capillaris. It approaches M. juncicola somewhat in
stature, color, and tendency of the pellicle to gelatinize. Kiihner
describes the amyloid reactions of the spores and tissues as weak,
and I have been able to verify this observation.
Mycena Lohwagii Singer (Bei. Bot. Centralbl., 46, Abt. 2: 93. 1930)
apparently has duller colors than the preceding three, but falls in this
general group and should be watched for in North America. The
following is a summary of Singer's account:
Very delicate, densely cespitose; pileus white, brownish on the
disc, truncate-campanulate, not umbilicate or papillate, glabrous,
striate to the disc, 3-6 mm. broad; lamellae white, distant, adnate,
or adnate-subdecurrent; stipe pallid yellowish brown, glabrous,
smooth, 60 X 0.5 mm.; odorless; spores 7-10 X 4.5-6,, ellipsoid;
cystidia lacking, gill edge homomorphic (lacking differentiated sterile
cells). On fern debris, but most abundant on living ferns. Ktihner
(1938) gives the spores as weakly amyloid and the cheilocystidia as
clavate and with roughened apices.
38. MYCENA TENELLA (Fr.) Quelet
Champ. Jura et Vosges, p. 343. 1872
Agaricus tenellus Fries, Epicr. Syst. Myc., p. 111. 1836.
Illustrations: Plate 9; Text fig. 7, nos. 7-8 (p. 91).
Pileus 3-10 mm. broad, obtusely conic, remaining so in age,
glabrous, moist, striate at first, somewhat sulcate in age, grayish to
avellaneous or "light pinkish cinnamon" to "vinaceous buff" and
fading to nearly white with a faint rosy tint or the disc finally creamy
yellowish; flesh thin but cartilaginous and firm; lamellae narrow,
close to subdistant, adnate, white or tinged with rose, edge at very
first tinged with rose but soon white or concolorous with the faces;
stipe 6-10 cm. long, 1 mm. or less thick, glabrous, dark drab gray
with a paler apex, rather firm and elastic; spores 8-10 X 5-6 u,
smooth, hyaline, staining faintly bluish gray with iodine in chloral
hydrate; cystidia abundant on edge and rare or scattered on the sides
of the lamellae, their apices echinulate; basidia four-spored.
Habit, habitat, and distribution.-Cespitose to densely gregarious
in low land; Washington and Oregon.
Material studied.-Smith, 1147, 2834, 4456, 17133, 17350, 17529.
Kauffman, Mt. Hood, Oregon.