Tuckerman,E 1845: An enumeration of North American lichens, 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. - John Owen\Cambridge, Mass.. 60 pp. pp. [Mattick Rec.# 30329] Keywords: NORTH AMERICA