North American species of Mycena.

372 NORTH AMERICAN SPECIES OF MYCENA

Spores 6-8 X 3-4 t, narrowly ellipsoid to suBcylindric, weakly
amyloid; basidia four-spored; pleurocystidia not differentiated, cheilocystidia 26-32 X 7-10,, embedded, clavate, hyaline, apex covered
with short rodlike projections which in age become elongated and
contorted or branched; gill trama homogeneous, sordid brownish in
iodine; pileus trama with a thin, somewhat gelatinous pellicle (in
KOH), a poorly differentiated hypoderm, the enlarged cells of which
are filled with a dark-brown fluid, and the remaining flesh of moderately broad hyaline hyphae, subhymenium very thin, all but the
pellicle yellowish to sordid brown in iodine.
Habit, habitat, and distribution.-Gregarious or scattered in moist
places, late fall; Tennessee, Michigan, and California. Apparently
it is a rather rare species; it fruits on old fern hummocks in wet places.
Material studied.-Smith, 33-605, 3707, 3843. Hesler, 12829.
Observations.-The long-decurrent tooth of the gills appears to be
a reliable character, as are also the straight margin of the pileus and its
generally conic shape. The species is distinct enough, but because
of the lack of an outstanding character to separate it from its relatives, many collectors may have difficulty in identifying it. When it
was first reported from Michigan I had not seen typical specimens of
Omphalia picta and thought it best to use Lange's name. Since that
time fresh material of 0. picta has been collected and studied. It is
entirely different from M. concolor, as Ktihner suspected. Ktihner's
disposition of Lange's variety appears to me to be the best solution
for the situation and is the one followed here. M. concolor might be
confused with M. cinerella, but the taste and odor of the latter species
should readily distinguish it. M. concolor is very close to M. misera
sensu Smith (see p. 369).
184. Mycena fuliginella, sp. nov.
Illustrations: Text fig. 44, nos. 5-6, 8 (p. 371).
Pileus 10-15 (20) mm. latus, obtuse conicus demum convexus vel
umbonatus, glaber, valde striatus, fuligineus, hygrophanus, demum
sordide cinereus, ad marginem laceratus; lamellae subdistantes, adnatae vel decurrentes, angustae, pallidae; stipes 2-3 (5) cm. longus,
1-1.5 mm. crassus, aequalis, glaber, fragilis, solidus vel fistulosus,
sursum pruinosus, deorsum albo-strigosus; sporae 8-10 X 4-4.5 Ai,
subeylindricae; basidia tetraspora; cheilocystidia clavata vel fusoideoventricosa, 33-62 X (5) 7-12 u. Specimen typicum in Herb. Univ.