""Revision Of The American Species Of Dryopteris Of The Group Of D. Opposita"" is a botanical book written by Carl Christensen in 1907. The book focuses on the classification and description of various species of Dryopteris, a genus of ferns, found in America. Specifically, it deals with the group of Dryopteris Opposita, which is a subgenus of the Dryopteris genus. The book contains detailed descriptions of each species, including their morphology, distribution, and habitat. It also includes illustrations and diagrams to aid in the identification of the different species. The book is an important resource for botanists and researchers interested in the classification and study of ferns in America.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.