Northeast Ferns, Second Edition, is a full-color field guide to the ferns and lycophytes (fern relatives) found in the northeastern United States. Included are keys, descriptions, color photographs, and distribution maps for all the ferns and lycophytes (quillworts, clubmosses and spike-mosses) known from the northeast region (Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, and Vermont). First published in 2013, the Second Edition updates nomenclature to conform to that proposed by the Pteridophyte Phylogeny Group in 2016, adds all new color photographs, and updates known county-level distributions for each taxa covered in the book.