Excerpt from The Fungi Which Cause Plant Disease Diseases of Economic Plants. Effort has been made to avoid duplication of matter contained in that volume. Abundant citations to the more important papers are given, sufficient, it is believed, to put the student in touch with the literature of the subject. While many parasites not yet known in the United States are briefly mentioned, especially the more important ones or those which are likely to invade America, no attempt has been made to list all of these. N on - parasitic groups closely related to those that are parasitic have been introduced in the keys merely to give a larger perspective to the student. Effort has been made to give at least one illustration of each genus that is of importance in the United States. 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 technology 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.