At last, a light and easy-to-use field guide to the rich lichen flora of Northeastern North America. The authors have designed this user-friendly guide for amateur naturalists, nature interpreters, forestry workers, land surveyors, researchers, and the general public. Meant to fit in a pocket or backpack, it requires no previous botanical experience and is written in non-technical language. One hundred and thirty-eight lichens are featured. The guide is formatted so that each page is arranged by the surface a featured lichen grows on in the field, its shape or growth form, and then its color.