As a result of its history of glaciation, Michigan abounds in poorly drained habitats favorable to the growth of Sphagnum. In recent years considerable interest in the taxonomy, distribution, and ecology of the genus, so poorly understood by American bryologists, has centered around the UMBS in northern Michigan. Access to the abundance of collections made by numerous bryologists visiting the area or by students in bryology over a period of 50 years has enabled the junior author to confirm records of 25 species from the Straits of Mackinac area (Cheboygan, Emmet, Mackinac, and Presque Isle counties). ... Charlevoix county, lying immediately sw of this group of counties, on the shore of Lake Michigan, was selected for special study in the summer of 1969 because of ease of access from the Biological Station and because not a single record of Sphagnum is noted from that county in Darlington’s recent Mosses of Michigan. We made several trips to the county and found 15 species in the localities listed below.