. Lectures on the evolution of plants. Botany; Plants. ALG^ 79 tween the cells. Parthenogenesis is probably a not in- frequent phenomenon, and marks the extreme point of divergence from the typical green algse. Both Phseophycese and Rhodophycese reach a far higher degree of specialization of the plant body than is ever met with among^ the Chlorophycese, but there is no evidence that either group has given rise to any higher types of plant structure than exist at present within the classes themselves, the most specialized of the existing forms representing probably the highest expression of the
. Lectures on the evolution of plants. Botany; Plants. ALG^ 79 tween the cells. Parthenogenesis is probably a not in- frequent phenomenon, and marks the extreme point of divergence from the typical green algse. Both Phseophycese and Rhodophycese reach a far higher degree of specialization of the plant body than is ever met with among^ the Chlorophycese, but there is no evidence that either group has given rise to any higher types of plant structure than exist at present within the classes themselves, the most specialized of the existing forms representing probably the highest expression of these peculiar structural types. The assumed relationships of the main group of Algse may be illustrated by the following diagram : —. VolvocinesB Greea AlgjB. 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 Campbell, Douglas Houghton, 1859-1953. New York, London, The Macmillan company
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