I am most grateful to the Minnesota Biological Survey and the Natural Heritage and Nongame Research Division of the Minnesota Department of Natural Resources and more particularly to their supervisors, Carmen Converse and Bonita Eliason, for funding this project. I also wish to thank sincerely Dr. Eville Gorham and Dr. Herbert Wright, Jr. for sponsoring many projects with a substantial component of bryophyte research in the State of Minnesota and elsewhere during the last 18 years. I acknowledge access to the bryophyte collections of the University of Minnesota herbarium at St. Paul (MIN) through the courtesy of Dr. Clifford Wetmore and, at Duluth (DUL), Dr. David Schimpf. I thank Erna Janssens-Verbelen and many on the staff of the Minnesota Biological Survey and the Natural Heritage and Nongame Research Division of the Minnesota Department of Natural Resources, in particular Norm Aaseng, John Almendinger, Lynden Gerdes, Welby Smith, and Scott Zager, for help with field work. Hal Watson very ably produced the maps presented in this atlas and provided the digitized data for the Province boundaries of Minnesota's Ecological Classification System. Paul Purman provided the technical expertise to make this county atlas available on the web. I am indebted to Howard Crum, Lars Hedenäs, Jonathan Shaw, and Richard Zander for critical annotations. Significant collections were obtained from Gerald Wheeler and Paul Benson-Lender. Editorial comments by Dr. Eville Gorham are very much appreciated.