Excerpt from Nereis Boreali-Americana, or Contributions to a History of the Marine Algae of North America, Vol. 2: Rhodospermeae The most obvious characteristic of the plants of this sub-class is their colour, though this varies through every shade of red and purple into red brown, or pure brown and degenerates, under the influences of sun-light and shallow water, into orange, yellow, or dull green. Still, some faint tint of redness, or the absence of olive-green or grass-green, prevents the student from confounding the faded Rhodospermece with either of the other groups into which the Algae are divided. 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.