North American species of Mycena.

EUMYCENA: CYANESCENTES

65

and Michigan in the United States and from Nova Scotia, Ontario,
and Manitoba in Canada. Although I have watched for it along the
Pacific coast, I have never been able to find it there. Kauffman
failed to collect it either on the West Coast or in the Rocky Mountains.
Material studied. -Smith, 32-114, 32-363, 32-624, 33-162, 33-218,
33-378, 33-379, 33-517, 33-530, 33-700, 415, 457, 689, 768, 840, 905,
979, 1314, 1349, 1364, 1384, 4700, 6272; 6322, 6350, 6373, 9563, 10054,
15068. Atkinson, 2382, 2389, 9686, 14679, 15138, 15335, 18443,
21234, 22677, 23037, 23304, 24813. Bisby, July 10, 1932, Manitoba.
Burke, 1942, Alabama. Hesler, 10054, 14183. Kelly, 1185. Kauffman, New York and Michigan. Mains, 32-72, 33-517, 33-700.
Overholts, 1528, 3919, 7610.
Observations.-Except for its globose spores and habitat near or
on hardwood debris this species has all the diagnostic characters of
M. amicla. The remarks about color which are given for M. amicta
apply equally well to M. subcaerulea. I have had the latter in culture.
On malt agar it produces a fine white mycelium, the aerial hyphae of
which develop a beautiful pale-blue tint if they are grown in diffused
daylight.
Mycena pachyderma, M. cyanorhiza, and M. cyanescens are not
known from North America. Ktihner placed M. pachyderma in this
section because of its pubescent stipe and the gelatinous pellicle of the
pileus. It apparently lacks the bluish colors exhibited by the others.
The species might also be put in the Corticolae. Its habitat, stature,
late occurrence, and globose spores relate it to M. corticola. Through
M. pachyderma the sections Corticolae and Cyanescentes appear to
be closely related.
Mycena cyanescens is said to turn blue when wounded. Its pileus
is 8-10 mm. broad, the stipe 5-8 cm. long, 1 mm. +- thick, and covered
entirely with a pruinose mealy coating. The gills are crowded, and
the spores measure 8-9 X 5-6 M. If the cheilocystidia actually have
a yellow content, it is very probable that the gill edges are bordered
with yellow. The species is apparently very rare in Europe.
Mycena cyanorhiza has been studied critically by both Ktihner
and Josserand. Its pileus is 3-9 mm. broad across the base; the
stipe is 1-3 cm. long and 0.2-1 mm. thick. The pileus has the typical
gelatinous pellicle. The stipe is entirely pubescent and looks as if
it had been powdered with blue near the base. The gills are described
as being fairly close and as having gelatinous edges, an unusual and
distinctive character for a species of this group.