North American species of Mycena.

EUMYCENA: CALODONTES

flesh thin, pliant, sordid pinkish to whitish, odor and taste not distinctive; lamellae moderately close to subdistant, 15-24 reach the
stipe, one or two tiers of lamellulae, usually horizontal and broadly
adnate in mature pilei, sometimes arcuate, sometimes slightly notched,
narrow to moderately broad (2.5 mm. ~), intervenose, pale to rather
bright rose color, the edges a darker sordid-reddish color; stipe 2.5-7
cm. long, 1-1.5 (2.5) mm. thick, equal, terete, strict or flexuous, tubular, rather flexible, base white-strigose or white-mycelioid, glabrous
above, color pale rose or grayish rose, clearer above, more sordid below, translucent, lubricous but not viscid.
Spores 7-9 X 4-5 gj, narrowly ellipsoid, amyloid; basidia fourspored; pleurocystidia abundant, 60-80 X 10-14,, arising from the
gill trama and projecting 15-30 tu beyond the basidia, narrowly fusoidventricose, smooth, with reddish contents when fresh; cheilocystidia
clavate to subfusoid, 21-36 X 9-15,, covered over all with short
obtuse projections, the apex occasionally elongated and smooth and
then only the ventricose portion roughened, contents dark reddish;
gill trama homogeneous, not appreciably amyloid; pileus trama with
a thin somewhat gelatinous pellicle, a well-differentiated hypoderm
and the remainder filamentous, not appreciably amyloid.
Habit, habitat, and distribution.-Gregarious in large troops or
scattered on needle beds under conifers, common and widely distributed. One may expect to find it in conifer regions throughout
North America. I have collected it in such regions in Michigan,
Idaho, Washington, Oregon, and California in the United States and
in Nova Scotia and Ontario in Canada. It is often abundant in open
stands of pine.
Material studied.-Smith, 34-187, 723, 806, 3207, 3270, 3333, 3434,
3479, 4329, 5034, 7926, 8119, 8344, 8764, 8922, 9084, 16512, 16770,
16796, 18176. Atkinson, 22725, 24242, 18491 (as M. rubromarginata),
13996 as M. subincarnata. Ellis & Everhardt, North Am. Fungi,
2006. Kauffman, Pennsylvania, Michigan, Montana, Wyoming,
Oregon. Mains, 34-79, 1935, Michigan. Overholts, 18945. Slipp,
UIFP: 3248, 3581. Wehmeyer, 794, 794a.
Observations.-Ktihner described the tramae of the pileus and
gills as amyloid, a character which did not appear very distinctive in
my sections. In dried specimens the pellicle of the pileus gelatinizes
more in weak KOH than it does in water mounts of fresh material.
Thus one is likely to obtain a false impression of the viscidity of the
cap if he is limited to a study of herbarium specimens. The flexible