. Lectures on the evolution of plants. Botany; Plants. ALG^ 69 The CoNJUQAT-a: The members of the second subsidiary order of the green algse, the Conjugatse, are mostly fresh-water plants, having very marked characteristics, and distin-. FlG. 13 (Conjugatae). — A, two filaments of Spirogyra showing the be- ginning of conjugation; each cell contains a single large spiral chlo- roplast with the pyrenoids, p; B and G, later stages of conjugation; in C the contents oi one of the conjugating cells has passed completely over into the other, the united protoplasmic masses forming the resting- spore,
. Lectures on the evolution of plants. Botany; Plants. ALG^ 69 The CoNJUQAT-a: The members of the second subsidiary order of the green algse, the Conjugatse, are mostly fresh-water plants, having very marked characteristics, and distin-. FlG. 13 (Conjugatae). — A, two filaments of Spirogyra showing the be- ginning of conjugation; each cell contains a single large spiral chlo- roplast with the pyrenoids, p; B and G, later stages of conjugation; in C the contents oi one of the conjugating cells has passed completely over into the other, the united protoplasmic masses forming the resting- spore, sp ; D, Closterlum, one of the Desmids or unicellular Conjugatse; p, a pyrenoid; E, two views of another Desmid, Staurastrum; the shaded portion represents the chloroplast; F, a Desmid, Cosmariam, in process of cell-division. guished from most of the other algse by the complete absence of ciliated cells. The most familiar members of the group are the " pond-scums," which occur in large, frothy masses, floating in quiet water. The lowest of the order are the Desmids, perhaps the most beautiful of all unicellular plants (Fig. 13). The lowest of the desmids are simple oval cells, with. 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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Keywords: ., bookcentury1900, bookdecade, booksubjectbotany, booksubjectplants
