Northeast Ferns is a comprehensive field guide to the ferns and fern relatives found in the states of Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, and Vermont. Included are keys, descriptions, illustrations, and distribution maps for 19 families and 36 genera of true ferns, and 3 families and 8 genera of fern relatives (quillworts, clubmosses and spike-mosses).