North American species of Mycena.

EUMYCENA: TYPICAE

351

these specimens at the New York Botanical Garden and found that
they possessed abundant pleurocystidia similar to those of M. niveipes.
Although I reeixamined Peck's type later, I failed to find in it any
fruiting bodies with pleurocystidia. Thus Murrill actually did not
have correctly determined specimens of C. ligniaria at hand when
he made his study. However, the material Murrill received from
Peck and the fruiting bodies in Peck's type are indistinguishable
macroscopically, and it appears that Peck's mistake really did not
mislead Murrill.
Among Murrill's new species of Collybia I found that C. dentata
had the same microscopic characters as M. galericulata and the same
appearance when dried. The only detail in the original description
that does not check equally well with M. galericulata is the habitat
on lawns. Because of the manner in which the base of the stipe in the
type specimen is broken off one can obtain no information about its
mode of attachment, but since in all other respects the carpophore is
obviously a Mycena of the M. galericulata group, it is safe to assume
that his specimen came from buried wood. I have occasionally collected such fruiting bodies of M. galericulata in waste places where
there was no evidence of lignicolous debris above ground, and they
were always attached to buried sticks or roots. See Buller (1934)
for additional information on this point.
Mycena Atkinsoni also appears to be identical with M. galericulata.
Its microscopic characters are the same as those given in the foregoing
description of the species. The specimen reported from Michigan
under this name was found on very rich humus, but differs in no other
respect from a typical M. galericulata. In the original description
the stipe is described as becoming tawny or chestnut below. This
is a darker color than I have observed, but, since the species is generally described as having a stipe with a brownish base, the difference
is one of only a slight degree of coloration, and can hardly be significant.
The type of M. atridisca has spores 7-10 X 5-6.5 A, instead of
6-7 X 4-5 1, as given by Murrill. It also has the typical cheilocystidia of M. galericulata. The iodine reaction of the spores and
tissues of the pileus and gills was not characteristic for M. galericulata,
but the specimens were obviously very poorly dried, and hence it
does not appear advisable to place much emphasis on their iodine
reactions. Hesler's 14200 appears to be a form in which the cheilocystidia are very rare to absent. It was collected May 24, 1942,
near Mt. Le Conte in Tennessee.