Excerpt from The Journal of the College of Science, Imperial University of Tokyo, Vol. 43: 1919-1921 More than 32 species of Alaria have been described by various writers since greville established the genus in 1880. Not a few of them have been reduced to synonymous positions of the others and only about half of them are now admitted to be more or less valid. But the synonymizations by different writers frequently do not agree with one another so that the true number of valid species is not yet satisfactorily fixed. The complaint made by ruprecht seventy years ago may still be repeated by modern al gologists. 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.