. Botany of the living plant. Botany; Plants. GREEN ALGAE 369 of their branches together, as in Codium, or by cementing those branches together, as in Halimeda. But these are concessions to an essentially weak construction. It is only possible to carry it to any considerable size when living in water, and all the larger forms are marine. Vaucheria is an exception : for though many of its. Fig. 27t. Vaucheria sessilis. A = young sporangium. B= zoospore, with the spor- angium from which it has escaped. C =a portion of the peripheral zone of a zoo- spore. D = a young plant, with rhizoids, develop
. Botany of the living plant. Botany; Plants. GREEN ALGAE 369 of their branches together, as in Codium, or by cementing those branches together, as in Halimeda. But these are concessions to an essentially weak construction. It is only possible to carry it to any considerable size when living in water, and all the larger forms are marine. Vaucheria is an exception : for though many of its. Fig. 27t. Vaucheria sessilis. A = young sporangium. B= zoospore, with the spor- angium from which it has escaped. C =a portion of the peripheral zone of a zoo- spore. D = a young plant, with rhizoids, developed from a zoospore. (A, B, after Gotz ; D after Sachs ; C after Strasburger.) (From Strasburger.) species float in water, some live on moist soil, exposed to the air. But the members of the genus consist only of simple or branched filaments, and when living aerially they lie procumbent. The cytoplasm of these plants contains many small chloroplasts, and numerous nuclei usually lying internally to them. Centrally is a large vacuole. In Vaucheria the product of photosynthesis appears as oil, but others of the Siphonales may contain starch, which. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bower, F. O. (Frederick Orpen), 1855-1948; Wardlaw, C. W. (Claude Wilson), 1901-. London, Macmillan and Co. , ltd.
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