North American species of Mycena.

56 NORTH AMERICAN SPECIES OF MYCENA

equal, flexuous, often ascending and curved, hyaline, more or less
soiled grayish brown, glistening puberulent under a lens, sometimes
glabrescent at least toward the base, fistulose, with a basal disc 1-1.5
mm. broad, convex, pubescent, white, striate to plicate on the upper
side, sometimes arising from a sclerotium with brown walls, which
is hidden in the mesophyll of the leaves that support it.
Spores elliptic, 8-10 X 3.2-4.5 At, nonamyloid, germinating on the.
gills; basidia four-spored, 18-24 X 7.5-8.5 y; cheilocystidia elongated
and hardly inflated (4-7.5 /u in diameter), or ventricose to clavate,
not covered with bristles but often furnished at the summit with a
few (2-3) short projections; gill trama with subglobular hyphae (35 -40 u thick); subhymenium very thin, loosely branched, and not gelatinous; the gill edge more or less gelatinous and swollen; flesh of the
pileus distinctly amyloid, the hyphae radially arranged, somewhat
interwoven, and with a violaceous-brown pigment; pellicle of pileus
gelatinous, 35-58, thick, the surface hyphae with short granulose
projections.
Habit, habitat, and distribution.-On Juncus and rarely on Carex,
August and September; Europe. I have not been able to recognize
this fungus with certainty in North America. Occasional single
specimens on Carex from Michigan may possibly belong here. The
pellicle did not gelatinize in water mounts, however, and no sclerotium
was found in the host tissue. No specimens have been preserved.
7. MYCENA CLAVULARIS (Fr.) non Lange
Mycena globispora Kiihner, Bull. Soc. Linn. Lyon, 10: 125. 1931.
(Translated and adapted from KUihner, Encyc. Myc., 10: 180. 1938)
Pileus 4-7 mm., hemispheric to convex (2.5-4 mm. across the
base), radially striate and more or less plicate, hyaline and pale,
with striae and center grayish or of a clear grayish brown, densely
and distinctly but very finely villous-pubescent under a lens (10X),
the pellicle gelatinous; flesh thin; lamellae 8-11 reach the stipe, one
or two tiers of lamellulae, distant, whitish or a whitish gray with the
edge white, ventricose, ascending, free because they separate from the
stipe forming a star-shaped collar around it. Stipe 4-10 mm. long,
0.2-0.5 mm. thick, filiform, equal or subattenuated from the base
upward, hyaline, translucent and shining except toward the base,
where it is white floccose-villous, with a narrow or often broad basal
disc, which is white and villous-tomentose.