Excerpt from The Marine Algae of the Pacific Coast of North America, Vol. 3: Melanophyceae Multicellular thallophytes containing the green pigment, chloro phyll (including xanthophyll), and the brown pigment, phycophaein; thallus varying from simple or slightly branched filaments of a single row of cells and simple membranes varying from a single layer to several layers of similar cells, to solid plant bodies of varying form, e.g., membranous, crustaceous, globular, hemispherical, filamentous, etc., and with differentiated internal and external tissues; cells with distinct cell walls, cytoplasm, at least the outer cells containing definite chromatophores, carrying the pigments, and typically uninucleate, although at times becoming multinucleate; assimilation products various carbohydrates and Oils, but never true starch; internal cells in more complex forms elongated and forming definite mechanical conducting and storage systems as distinct from the outer tissues of absorbing and assimilating cells; multiplication by splitting and by gemmae of more or less distinctive form; reproduction by both motile and non-motile cells, motile cells with one or two lateral, or at least subapical, cilia; non-sexual reproduction by 2-ciliated zoospores or by aplanospores (dictyotales) sexual reproduction by the fusion Of two equal, or Of two unequal, motile gametes, or by the fusion of a smaller motile 2-ciliated sperm and a larger non-motile egg (lamina riales and Fucales) or by the fusion of a smaller 1-ciliated sperm and a larger non-motile egg (dictyotales); an antithetic alternation of generations present in many, if not all, species; gametophytes usually unisexual, similar to, up to extremely different from, the sporophytes. 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.