Ferns and Lycophytes of Minnesota : The Complete Guide to Species Identification, Paperback by Smith, Welby R.; Haug, Richard (PHT), ISBN 1517914663, ISBN-13 9781517914660, Like New Used, Free shipping in the US

"Ferns and Lycophytes of Minnesota is the first comprehensive presentation of these oldest of land plants in Minnesota. Created for natural resource professionals as well as avid gardeners, hikers, and naturalists at all levels, this easy-to-use reference enables the quick and reliable identification of each of the one hundred species of ferns and lycophytes that grow wild in Minnesota"--