. Plant life and plant uses; an elementary textbook, a foundation for the study of agriculture, domestic science or college botany. Botany. 364 THE NON-VASCULAR PLANTS. 3Q Fig. 161.âNostoc. The small figure at the right indicates the jelly-like mass formed by a sort of mucilage excreted by the cells of this plant. Such masses, brown in color, are often found on damp rocks in shady places. Within them the filaments of Nostoc B. Colonial Forms. \ â In algae of this kind the cells are individual plants, but they occur in groups called colonies. They are held together by a substance which is manuf
. Plant life and plant uses; an elementary textbook, a foundation for the study of agriculture, domestic science or college botany. Botany. 364 THE NON-VASCULAR PLANTS. 3Q Fig. 161.âNostoc. The small figure at the right indicates the jelly-like mass formed by a sort of mucilage excreted by the cells of this plant. Such masses, brown in color, are often found on damp rocks in shady places. Within them the filaments of Nostoc B. Colonial Forms. \ â In algae of this kind the cells are individual plants, but they occur in groups called colonies. They are held together by a substance which is manufactured and ex- creted by the cells. Nostoc and Rivularia are examples of such forms. Nostoc is found in jelly-like lumps; Rivularia in lie embedded as shown in the larger figure, blue-green patches. Note four cells of the Both are found in filaments which are dif- â , /c â ferent from the others. damP PlaCeS- (See These are called helero- Figures l6l and 162.) cysls- It will be noted that the cells are not all alike. In Rivularia there is a difference between the cells at the base and those at the apex of the chain, while in Nostoc occasional cells are much larger than their neighbors. The reproduction of these plants is by cell divi- sion only, as in Pleurococcus. Oscillatoria is a blue-green form which is often found on wet soil. In it the cells are so closely ^cl^STnd pressed together that they lose their spher- in running water. ical shape. They have the shape of round The "i^t tapers 1 J â¢* into a whip-like ex- pill-boxes. (See Figure 163.) Yet they 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 Coulter, John G. (John Gaylord), b. 1876. New York, American Book Co
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