North American species of Mycena.

50 NORTH AMERICAN SPECIES OF MYCENA

to be the typical form of M. osmundicola. I suspect that the same
is true of the material reported as M. setosa by Beardslee and Coker
(1924). Ktihner does not regard M. setosa as sufficiently well known
to be recognized. Fries placed it in the section Insititiae. Rea lists
M. tenerrima Berk. as a synonym of M. setosa. There seems little
hope of stabilizing the application of names in such a group of small
fungi as this unless one arbitrarily accepts those names of species
which have been clearly described, and abandons those over which
there has been much disagreement, even though the latter fall within
the time limits established by the International Rules of Nomenclature.
SECTION BASIPEDES
3. MYCENA MUCOR (Fr.) Quelet
Champ. Jura et Vosges, p. 436 (8 in reprint). 1875
Agaricus (Mycena) Mucor Fries, Syst. Myc., 1: 155. 1891.
Pseudomycena Mucor Cejp, Publ. Fac. Sci. Univ. Charles, 104: 144. 1930.
Illustrations:
Plate 2 A.
Lange, Flora Agar. Dan., 2, pl. 56 A.
Pileus 2-5 mm. broad, ellipsoid at first, becoming broadly conic
and later expanding to convex or plane, when moist conspicuously
striate, glabrous but appearing pruinose at first, pallid watery grayish
over the disc and striations, the remainder watery white, fading to
whitish, sometimes hyaline white over all when moist; flesh very thin
and soft, pileus readily separable from the stipe, odor and taste not
recorded; lamellae rather distant, 6-9 reach the stipe, one or two tiers
of lamellulae, ascending-adnate but becoming horizontally adnate,
seceding but adhering to each other to form a collar around the stipe,
white, edges even; stipe 1-3 (4) cm. long, filiform, straight or flexuous,
equal above a distinct rounded bulb, bulb disappearing somewhat in
age and visible only as an inconspicuous flattened disc, bulb and lower
portion of the stipe slightly pruinose-pubescent, sometimes glabrous,
sometimes with scattered flexuous hairs, translucent white over all.
Spores 7-10 X 3-4,u, subcylindric to somewhat pear-shaped,