North American species of Mycena.

36 NORTH AMERICAN SPECIES OF MYCENA

studying the types of various species of agarics described by previous
investigators, I found that in some instances certain authors had described the same species as new more than once. This happened
most frequently when they relied on notes accompanying the specimens. It is the possibility of getting misinformation from the notes
that creates the need for caution. In general, in the following text
all new species have been based on studies of fresh specimens. However, in such clear-cut cases as that of M. cayugaensis, described from
Atkinson's collections, I have made an exception to the rule because
the character by which the plant is distinguished, namely, the lack
of pleurocystidia, can be determined as easily from herbarium specimens as from fresh material.
All my own collections and those of Brown, Burke, Kauffman,
Mains, and Povah are deposited in the University of Michigan Herbarium. The collections of Hesler are for the most part deposited
in the Herbarium of the University of Michigan and the Herbarium
of the University of Tennessee. Atkinson's are in the Atkinson
Herbarium of Cornell University, Ithaca, New York, and Peck's are
at the New York State Museum, Albany, New York. The type
specimens of the new species described by Dr. W. A. Murrill while
he was at the New York Botanical Garden are deposited in the
herbarium of that institution in New York City. Those he has
described recently from Florida are in the Herbarium of the Florida
Agricultural Station, Gainesville, Florida.