The Great Lakes region lies in a highly glaciated part of North America and therefore possesses a terrain which provides many hundreds of lakes, swamps, and marshes. Thus the area is highly suitable for an abundant algal flora, especially because of variation in water chemistry-a variation which is related primarily to the geological history and nature of the underlying rock in the different sections. Hence the list of algal species in the Great Lakes region is a long one. Approximately 1300 algae (exclusive of desmids and diatoms) have been reported from Wisconsin and Michigan, the latter region being represented principally in the papers of Ackley, Gustafson, Taft, and Transeau. To date, no major treatment of Michigan algae has appeared, but in 1920 and 1924 Gilbert M. Smith published the results of his extensive phytoplankton surveys of Wisconsin lakes. Probably for no other area of comparable size anywhere in the world has so much systematic field work been done, or so detailed and informative a presentation of algal distribution been issued. Smith's volumes, which are based upon collections made during the period 1913 to 1917, represent a survey of some 230 lakes, mostly in the northern counties of the state. Division CyanophytaClass Myxophyceae: Orders Chroococcales; Chamaesiphonales; Hormogonales-CZass Chlorobacteriaceae. Division RhodophytaClass Rhodophyceae: Orders Bangiales; Nemalionales.

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