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INTRODUCTION ix
Illinois State Teachers College; Clarence E. Taft, The Ohio State
University; Hiram Thut, Eastern Illinois State Teachers College;
L. H. Tiffany, Northwestern University; and Larry Whit-
ford, Agricultural and Technical College of North Carolina.
In checking the descriptions, keys, and references, I had the
assistance of Mrs. Maynard Hale and Mrs. Robert Sigafoos. They
added much to the accuracy of the text, the indexing, and the
uniformity of the references. Professor John L. Blum of Canisius
College, Buffalo, copied or adapted many of the published figures
and added many new figures and details of spore walls. Without
his help the publication would have been greatly delayed. I am
grateful to each of these associates for their contributions to the
usableness of the keys.
The Graduate School of The Ohio State University has aided
in the editorial work, and in the preparation of the figures and
plates. It is a pleasure to acknowledge this financial assistance.
No attempt has been made to draw the figures to a certain
scale of magnification. Since the descriptions give the dimensions,
the principal value of the illustrations is the form of the various
structures associated with reproduction and the details of spore-
wall markings. The 789 figures illustrate 534 species, and all of
the known types of gametangia and spores.
Columbus, Ohio
1950
E.N.T.