North American species of Mycena.

EUMYCENA: CALODONTES

195

from the broken cuticle, pallid grayish over all or the apex bright to
sordid yellow beneath the purple fibrils, flesh grayish below, yellowish
in the apex.
Spores subovoid to ellipsoid, pointed at one end, 8-10 X (3.5)
4-5 A, amyloid; basidia four-spored, 26-28 X 5-6 A, cheilocystidia
abundant, smooth, narrowly ovoid to somewhat fusoid and with obtuse apices, contents dark reddish brown, 40-60 X 9-15,; pleurocystidia abundant, more elongated than the cheilocystidia, 60-80
X 9-15 g, contents reddish brown, gill trama vinaceous brown in
iodine; pileus trama with a thin subgelatinous pellicle, the cells of
which may have reddish contents, an indefinite region of enlarged
cells beneath it, the remainder floccose-filamentous (the pellicle may
become washed or worn away in old pilei), all tissue beneath the
pellicle vinaceous brown in iodine.
Habit, habitat, and distribution.-Gregarious to scattered on
humus and debris, usually under oak and hickory during the spring
and fall; Maryland, Pennsylvania, New York, Ohio, Michigan,
Missouri, and Washington in the United States and Ontario in
Canada.
Material studied. -Smith, 32-500, 1095, 2565, 3389, 3980, 5013,
5039, 6431, 6943, 9569, 10933, 11065, 11086, 15089, 15296, three
collections in 1929, one in 1932 and one in 1940, Michigan. Kauffman, Pennsylvania. Kelly, 492, 709. Walters, 1941, Cleveland,
Ohio.
Observations.-The pellicle is somewhat separable and gelatinous
but not enough so to be of very much aid in identifying the fungus.
The purplish-brown colors of the cap vary greatly and are quite bright
at times. The yellow at the apex of the stipe may be completely obscured by the dense covering of bright-purplish fibrils.
The specimens Kauffman (1918) referred to M. denticulata belong
in M. Kauffmanii Smith. Both M. pelianthina and M. rutilantiformis
are typically large fungi, but the type collection of the latter happened
to consist of exceptionally small individuals. I have seen specimens
which were well within the range in size originally given for the
species. For a comparison of these two see M. pelianthina.
SECTION CALODONTES
Mycena Kauffmanii, M. marginella var. rugosodisca, M. rutilantiformis, M. pelianthina, and M. oregonensis, in addition to all