North American species of Mycena.

374 NORTH AMERICAN SPECIES OF MYCENA

margin of the pileus of M. fuliginella, but this character will probably
be found to be variable. M. fuliginella is easily distinguished from
M. concolor, M. misera, and M. subconcolor by its cystidia. From all
but M. concolor its spores also readily distinguish it. It is very close
to M. pallida Murrill, but the lack of a pellicle and the presence of a
very distinct intracellular pigment in the enlarged cells forming the
surface of the pileus distinguish it. It also differs from M. pallida
in its longer and narrower spores on four-spored basidia and in its
habitat. M. fuliginella is a typically lignicolous species.
The margin of the pileus splits very readily because of the lack
of binding tissue to hold the large cells together. Hence weather
conditions can very easily cause the character to be pronounced or
very obscure, depending on whether they are constant during the
development of the carpophores or change rapidly.
185. Mycena pseudoclavicularis, sp. nov.
Illustrations: Plate 88; Text fig. 44, nos. 7, 9 (p. 371).
Pileus 1-2 cm. latus, obtuse conicus vel convexus, glaber, viscidus,
fuscus demum cinereus; lamellae confertae dein subdistantes, latae,
pallidae, late adnatae; stipes 3-4 cm. longus, 1-2 mm. crassus, aequalis, pallide cinereus vel fuscus, non viscidus; sporae 6-8 (9) X 3.5 -4.5,; pleurocystidia et cheilocystidia fusoide ventricosa, 22-48 (60)
X 8-11 L. Specimen typicum in Herb. Univ. Mich. conservatum.
Legit A. H. Smith, n. 8925, prope Takilma, Ore., Nov. 20, 1937.
Pileus 1-2 cm. broad, very obtusely conic to convex, becoming
broadly convex or the disc flattened, margin appressed or connivent
when young, surface viscid (as in M. vulgaris), glabrous, polished in
age, dull or very faintly pruinose at first, color evenly drab to pale
fuscous, fading slowly to dull sordid gray, more or less unicolorous
at all times, faintly striate to opaque when moist, margin slightly
sulcate in age; flesh thin but pliant-cartilaginous, pallid to gray, no
odor, taste mild; lamellae close to subdistant, broad, horizontally
adnate to arcuate, in age with a decurrent tooth, broad, white to
pale gray, edges even and pallid, no reddish stains developing; stipe
3-5 cm. long, 1-2 mm. thick, equal, cartilaginous-pliant and strict,
tubular, glabrous, and polished, concolorous with the pileus or paler
above, apex faintly pruinose, base hardly strigose or merely woollystrigose, lubricous when wet but without a gelatinous sheath.
Spores smooth, ovoid, 6-8 (9) X 3.5-4.5 j, strongly amyloid;