. Outlines of plant life : with special reference to form and function . Botany. H OUTLINES OF PLANT LIFE. zag chains, or even branched filaments {h, i, fig. ii). Other sorts may be attached singly or in clusters by a gelati- nous stalk {e, fig. ii). In all cases the jelly, like the rest of the cell-wall, is a product of the protoplasm. The slow gliding movements of some free diatoms are due to the pro- trusion of strands of protoplasm through slits in the Fig. 13.—Various desmids. a, Micrasterias: i, Cosmarium : c, Xanthidium : d, Clasterium : t, Staurastrum; f, Aptogonum. Magnified
. Outlines of plant life : with special reference to form and function . Botany. H OUTLINES OF PLANT LIFE. zag chains, or even branched filaments {h, i, fig. ii). Other sorts may be attached singly or in clusters by a gelati- nous stalk {e, fig. ii). In all cases the jelly, like the rest of the cell-wall, is a product of the protoplasm. The slow gliding movements of some free diatoms are due to the pro- trusion of strands of protoplasm through slits in the Fig. 13.—Various desmids. a, Micrasterias: i, Cosmarium : c, Xanthidium : d, Clasterium : t, Staurastrum; f, Aptogonum. Magnified about aoo diam. —After Kemer. 19. The desmids.—These form another group of one- celled green algae. They have neither the brownish color nor siliceous wall characteristic of diatoms, but are bright green cells of remarkably diverse and often beautiful forms. As a rule the cell is flattened and is divided almost into two by a deep constriction near the middle {a, b, c, e, fig. 13). Often the body of the cell is covered with warts or spine-like. 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 Barnes, Charles Reid, 1858-1910. New York : Henry Holt and Company
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