North American species of Mycena.

162 NORTH AMERICAN SPECIES OF MYCENA

creamy in age; flesh thin, equal, flexible to somewhat fragile, white,
odor and taste not distinctive; lamellae close to subdistant, narrow,
free or narrowly adnate, pure white, edges even or concolorous with
the surface; stipe 1-3 cm. long, 1 ~t mm. thick, equal, solid or with a
tubule, pliant but cartilaginous, base not at all bulbous and very
densely strigose, the hairs radiating to form a rather distinct mat,
densely pruinose-pubescent over all at first, appearing somewhat
glabrous in age, not changing color or becoming only slightly yellowish.
Spores 7-9 X 2.5-3, (four-spored), 9-12 X 3-3.5 g (two-spored);
subeylindric to slightly ventricose with a tapered apiculus, nonamyloid; basidia two- or four-spored; pleurocystidia and: cheilocystidia similar and very abundant but nevertheless difficult to
demonstrate, 18-26 X 4-6 (9) A, nearly cylindric or somewhat ventricose, the apex obtuse or rounded into a small head, often with a
conspicuous resinous deposit over the head; gill trama homogeneous,
yellowish in iodine, of narrow hyphae; pileus trama compact, homogeneous, yellowish in iodine, the surface covered with a dense turflike growth of cystidia and filamentous hyphae 15-28 X 3-8,, and
these often with contorted or rounded incrusted apices, sometimes
capitate; caulocystidia very numerous and similar to the pilocystidia.
Habit, habitat, and distribution.-Gregarious to scattered on fallen
twigs and needles of conifers; New York, Michigan, Idaho, Washington, Oregon, and California. It is fairly common during the late
summer and fall.
Material studied.-Smith, 33-726, 33-783, 33-819, 34-104, 277,
627, 727, 925, 998, 3134, 3226, 3443, 3510, 3542, 3619, 3671, 3702,
3709, 4322, 4407, 5072, 8036, 8041, 8748, 8820, 9398, 14979, 17846,
17964, 18148, August 30, 1934, New York. Kanouse, September 2,
1923. Kauffman (as M. ludia sensu Ricken), Wyoming; Mt. Hood
and Takilma, Oregon. Slipp, UIFP: 2595, 3131, 3680. Stuntz, 810.
Observations.-This species is best characterized by its long, cylindric spores, the cystidia of the gills, pileus, and stipe, and its generally
robust stature. The resinous incrustation of the cystidia (best demonstrated in revived material) causes both the pileus and the stipe to feel
slightly sticky to the touch. Because of this character one must be
careful not to confuse Marasmius resinosus with Mycena delicatella.
The stipe is not readily separable from the tissue of the pileus, and
for this reason the species cannot be placed in the subgenus Pseudomycena. I overlooked the cystidia in my first examination of the
type of Collybia delicatella. In order to demonstrate them clearly