Abstract
This paper is a second report of studies on North American types of Russula species. An earlier publication (Hesler, 1960) treated one hundred fifty-nine types of species of this genus; in this account thirty-four additional North American types are reported. In each of these papers, attention has been given to the spores (size and ornamentation), to the pleurocystidia and cheilocystidia, and to the epicutis and its component elements. Drawings to represent the characteristics of these structures are presented for each species. Acknowledgment is made to the National Science Foundation for a grant supporting these studies, and to The New York Botanical Garden Herbarium for a loan of types. The drawings, originally prepared by the author, were traced for publication by Mr. M. B. Yeligar, a graduate student in botany. In the illustrations, the spores are figured at a magnification x 1500; and other structures X 500.
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