An Enumeration of North American Lichenes, With a Preliminary View of the Structure and General History of These Plants, and of the Friesian System; to Which Is Prefixed, an Essay on the Natural Systems of Oken, Fries, and Endlicher

An Enumeration of North American Lichenes, With a Preliminary View of the Structure and General History of These Plants, and of the Friesian System; to Which Is Prefixed, an Essay on the Natural Systems of Oken, Fries, and Endlicher