Since the season of 1946 an intensive study of the fleshy fungi of northern Michigan has been in progress. With the University of Michigan Biological Station as headquarters, the tip of the Southern Peninsula, here referred to as the Douglas Lake Region, and Tahquamenon Falls State Park, in the Upper Peninsula, were studied intensively. During this time a large number of rare and interesting species were found, some of which have been reported (Smith, 1952). The present contribution consists of two parts. Part I is a general list which contains information on taxa on which more descriptive data were needed to characterize them properly, and also taxa regarded as previously undescribed. Part II consists of a revision of the genus Xeromphalina in North America. This revision was stimulated by the discovery of X. picta at Tahquamenon Falls by Miss Sheila Hoare, of the Canadian Department of Agriculture, who spent the summer of 1951 working at the Biological Station. All but two of the eight species recognized in the genus are known from Michigan. Additional contributions are to be expected as more of the unidentified collections are studied. The ultimate aim is, of course, to revise the Agaricaceae of Michigan and bring it up to date. The specimens cited are deposited in the University of Michigan Herbarium at Ann Arbor, Michigan. The color terms within quotation marks are those of R. Ridgway.