For the past five years I have been engaged in an intensive study of the Michigan species of Clitocybe. This project was undertaken to provide a basis for a revision of the North American taxa. Since the early accounts by Kauffman (1918, 1927), over a thousand collections of Clitocybe have been made within the state, chiefly by A. H. Smith, and, more recently, by myself. The examination of this material has revelaed several species and varieties which are undescribed.