The Marine Algae of the Pacific Coast of North America, Vol. 3: Melanophyceae (Classic Reprint) - Softcover

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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.

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