North American species of Mycena.

386 NORTH AMERICAN SPECIES OF MYCENA

2-3 mm. thick, equal, solid, cartilaginous, fragile, longitudinally
appressed-fibrillose striate (not with superficial fibrils and not pruinose
near the apex), color pallid to ashy brown (almost concolorous with
the faded pileus); spores 6-7 X 5-5.5 g, broadly ellipsoid, white in
mass, dark blue in iodine, smooth; basidia four-spored, 26-28 X 7-8 j;
pleurocystidia and cheilocystidia not differentiated; gill trama homogeneous, pale sordid yellowish brown in iodine; pileus trama corticated
by a palisade of inflated pedicellate cells 25-36 X 20-25 p, the remainder homogeneous.
"Scattered on wet ground near the edge of a swampy area, Dexter,
Michigan, September 23, 1938 (11050, 18650, 18651).
"... The lax flesh, the pale sordid olive-brown color of the pileus
when moist, the atomate glistening appearance of faded specimens,
the palisade of inflated cells over the pileus, and the strong bluish
reaction of the spores in iodine are all outstanding. In stature it
resembles Collybia ludoviciana Murrill, which, however, is much
more cartilaginous (dried material of both compared) and its spores
are yellowish in iodine. C. fissilis Maire is also readily distinguished
by the iodine reaction of its spores."
In view of the broad concept of Mycena adopted in this work,
it was necessary to transfer C. hymenocephala to Mycena, where it
falls in the Corticatae. Because of its very strongly amyloid spores
it does not appear to be related closely to the other members of the
section.
194. MYCENA LUDOVICIANA Murrill
Mycologia, 8: 220. 1916
Prunulus ludovicianus Murrill, North Am. Flora, 9: 330. 1916.
Illustrations: Text figs. 47, no. 1; 48, nos. 5-6 (p. 389).
"Pileus fleshy, firm, convex to expanded, gibbous, solitary, 3 cm.
broad; surface moist, glabrous, scarcely striate, dark-tan or nearly
fuscous: lamellae free or nearly so, crowded, of medium breadth,
whitish: spores subglobose, smooth, hyaline, 6-7 u: stipe cylindric,
equal, glabrous, pallid, shining, solid, 5 cm. long, 5 mm. thick.
"Type collected on the ground in a wet thicket at New Orleans,
Louisiana, September 8, 1908. F. S. Earle 132 (Herb. N. Y. Bot.
Gard.).
"Distribution: Known only from the type locality."