North American species of Mycena.

346 NORTH AM ERICN SPECIES OF MI'CENA

ish); flesh thin except under the disc, pallid to dark grayish, -n odor,
taste slightly rancid-farinaceous; lamellae adnatel often with a o tooth,
thin, close at first, subdistant in age, narrow to moderat.ey broad
(if ventricose, then appearin' widely sinuate and very broad), dark
gray to whitish at first, pallid in age, edges even; stipe (2) 5-) 9 (1 2) cm.
long, 1-3 mm. thick, hollow, very cartilaginous and tenacious, equal,
terete or compressed, base white-strigose, rooting somewhat, upper
portion pruinose, glabrous and shining in age, "fuscous" to "'storm
gray" when young, paler in agC — especially at the apex.
Spores ellipsoid to broadly ellipsoid, 7-9 (10) X 4-5 i,:myloid
(reaction very strong); basidia two- or four-spored, (25) 3 ---8 (40)
X 7-8 u; cheilocystidia embedded and inconspicuous, cylindric to
clavate, the upper portion covered with rodlike projections, which
often elongate to narrow contorted fing.erlike processes, 20-28 X
5-11, (variable in size and shape); gill trama vinaceous -brnown in
iodine; pileus trama with a thin subgelatinous pellicle, beneath it a
fairly well differentiated hypoderm, the remainder filamen-toss, all
except the pellicle vinaceous brown in iodine.
Habit, habitat, and distribution.-Gregarious to cespitose oni wood
of either conifers or deciduous trees; Alabama, Tennessee, fMaine,
New York, Ohio, Michigaln, and Missouri. It is very abundant in
northern Michigan duringl wet seasons.
Mattrial stvudied.-Smith, 32-36, 32-551, 32-557, 32-611, 32 -612,
32-629, 33-327, 1259, 1673, 6276, 6366, 11039, 14941, 14968, October
4, 1929, Ann Arbor, Michigan (fide Kauffman as M. di ssiliens).
Burke, Alabama, 1942. Hesler, 12955, 14087; Kauffman, No>vember
15, 18, 19, 1929. Kauffmani and Smith, Rock River, Michigan (as,1. tenacipesY. Mains, 5181. Overholts, 906, 1530.
OLserations.-The outstanding characters of this species are the
blackish colors vlhen younl.^ the cartilaginous consistency of aill parts,
the rather small spores, an.d the roughened cystidia. The lainellae
do not stain reddish wIhein bruised or in age —at least I have noti-, seen
threm dfo so.. M. 1. hcm(- isp.iaer/cr a and forms of 3f. ilit.inata, wltiich occur
locally late in the 'fall, a- '- very l similar in nearly all their characters,
but can be separated by the fibrils on the stipe of immature fruiting
bodies of M. inclinata and by its sordid stains, which become most
conspicuous in wet weather. The gills in M. hemisphaerica sometimes
appear thickish, but this is not an important character. Rather, it
appears to be an abnormality that is not uncommon in Mycena and
Collybia. I have frequently observed that such common species as