. Practical botany. Botany. THE GEEEN (C') 209 that are the result of the union of similar motile gametes, as in such green algae as llothrix and Cladopliora. Others, of which Funis is a representative, reproduce by means of oospores that are formed by the union of sperms and eggs.^ 193. Uses by man. At one time the world's supi)ly of iodine A\'as derived from the broA\'n algae; now it can usually be pre- pared more economically by chemical means. Soda was for- merly secured from these plants, but chemical processes have driven out the laborious methods of securing that subst
. Practical botany. Botany. THE GEEEN (C') 209 that are the result of the union of similar motile gametes, as in such green algae as llothrix and Cladopliora. Others, of which Funis is a representative, reproduce by means of oospores that are formed by the union of sperms and eggs.^ 193. Uses by man. At one time the world's supi)ly of iodine A\'as derived from the broA\'n algae; now it can usually be pre- pared more economically by chemical means. Soda was for- merly secured from these plants, but chemical processes have driven out the laborious methods of securing that substance duectly from plants. Gelatinous foods and a sugar known as mannite are se- cured from some species of brown algae. In some coastal portions of this country the farmers collect and carry inland great quantities of brown algae and spread them over the cultivated land as a fertilizer. 194. The red algae. The red algae QRhodojjhiieea'') chiefly inhabit deeper ^I'ater than do the brown algae. The class is almost -wdiolly confined to salt water, and the few that do live hi fresh water do not exhibit well the color characteristics of the class. <_^ue com- mon fresh-water genus is Batracliosjiermum (Fig. 172). The marine forms of this group present most striking shapes and colors. The}' are of different shades of red, varying from the most brilliant to tliose that are dark and somber, while some are a deep purple. C'hloroph}dl is present, but often is completely obscured by the other colors. Sometimes all the colors are obsciired by deposits of calcareous material upon the plants. 1 If desired to study further the details of reproduction of the brown algae, see Coulter, Barnes, and Cowles, College Botany, Vol. I; also Bergen and Davis, Principles of Fi I i. 172. X red alga (Batracho- spfytmnn), which is fairly com- mon in fresh waters Slightly magnified. Please note that these images are extracted from scanned page images that may have been digitally enhanced for reada
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