Excerpt from Sypsis of the Lichenes: Of New England, the Other Northern States, and British America The study of any group of plants, with a view to the true relations of the species brought together in it, and their real history, requires the investigation of a great number of individual states, and this often through a series of years. And there is, perhaps, family of plants in which extensive and continuous observation is more important than in the Lichenes. The present work is prepared, therefore, only as an Index and Introduction to the history of the plants described in it; and it has been my object rather to state results of foreign study, than to offer the necessarily imperfect conclusions of my own limited research. Use has constantly been made of the Lichegraphia Europ a Reformata of Fries, whose characters of the sections and genera I have, for the most part, adopted entire, or with only occasional amplification; and the profound descriptions of the Lichegraphia, as here applied to our species, constitute almost the whole descriptive value of the present enumeration. The exceptions to this will, I hope, meet with the indulgence which the extreme difficulty of any inquiries in a field as much neglected as this has been, among us, seems to demand. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art techlogy to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.