The elements of botany for The elements of botany for beginners and for schools elementsbotany00gray Year: 1887 fresh-water species, by Prof. H. C. Woods's ' Fresh-water Algae of North America,' a larger aud less accessible volume. A few common forms are here very briefly mentioned and illustrated, to give an idea of the family. But tliey are of almost endless diversity. 508. The common Rockwecd (Fucus vesiculosus, Fig. 554, abounding between liigli and low water mark on the coast), the rarer Sea Colander (Agarum Turneri, Fig. 5b'-\), and Laminaria, of which the larger forms are called Devil'
The elements of botany for The elements of botany for beginners and for schools elementsbotany00gray Year: 1887 fresh-water species, by Prof. H. C. Woods's ' Fresh-water Algae of North America,' a larger aud less accessible volume. A few common forms are here very briefly mentioned and illustrated, to give an idea of the family. But tliey are of almost endless diversity. 508. The common Rockwecd (Fucus vesiculosus, Fig. 554, abounding between liigli and low water mark on the coast), the rarer Sea Colander (Agarum Turneri, Fig. 5b'-\), and Laminaria, of which the larger forms are called Devil's Aprons, are good rejn-esentatives of the olive green or brownish Seaweeds. They are attached either by a disk-like base or by root-like holdfasts to the rocks or stones on which they grow. 509. The lioUow and inflated places in the Fucus vesiculosus or Rock- weed (Fig. 551) are air-bladders for buoyancy. The fructification forms in the substance of tlie tips of the frond: the rough dots mark the places where the coneeptacles open. The spores and the fertilizing cells are in different plants. Sections of the two kinds of coneeptacles are given in Fig. 555 and 556. The contents of the coneeptacles are discharged through Fig. 555. Magnified section through a fertile conceptacle of Rockweed, showing the large spores in the midst of tlireads of cells. 556. Similar section of a sterile conceptacle, containing slender antheridia. From Farlow's ' Marine Algae of New England.'
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