. Essentials of botany. Botany; Botany. 216 ESSENTIALS OF BOTANY OSCILLATORIA, — ONE OF THE BLUE-GREEN ALGiE 273. Occurrence. —- Oscillatoria may occur floating in stagnant water, about watering troughs or outlets of drains and sewers, or on pots in greenhouses. In general it flour- ishes in the presence of dissolved and decaying organic matter. 274. Gross Structure. — Examine with the magnifying glass a bit taken from a growing mass of the plant and left for some hours in a white saucer with a little water. Note: (a) The color. (6) The filaments radiating from the rather compact mass of the p
. Essentials of botany. Botany; Botany. 216 ESSENTIALS OF BOTANY OSCILLATORIA, — ONE OF THE BLUE-GREEN ALGiE 273. Occurrence. —- Oscillatoria may occur floating in stagnant water, about watering troughs or outlets of drains and sewers, or on pots in greenhouses. In general it flour- ishes in the presence of dissolved and decaying organic matter. 274. Gross Structure. — Examine with the magnifying glass a bit taken from a growing mass of the plant and left for some hours in a white saucer with a little water. Note: (a) The color. (6) The filaments radiating from the rather compact mass of the plants. 276. Minute Structure. — With note: (a) The shape of the filaments. Are they branched ? (6) Their movements. Describe these. Sketch several filaments. With note: (c) The shape of the tip of a filament. (rf) The coin-shaped cells of which the filaments are made up. (e) The occasional occurrence of a dead cell, leaving a transparent place in the filament. (/) The delicate sheath inclosing the filament (best seen where a dead cell occurs). Make a careful drawing showing the points (c, d, e,f) above mentioned. 276. Discussion. — Oscillatoria is a plant of very low organization, marked, for example, by the absence of a well-defined nucleus in the unit cells of which the fila- ments are composed. Each cell is an individual plant, although, as the student has seen for himself, they live in communities. The flattened form of the cells is evidently. Fig. 150. Gloeocapsa, one of the Lowest of the Blue- Green Algse. (X 300.) A-E, successive stages in the development of new indi- viduals from a 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 Bergen, Joseph Y. (Joseph Young), 1851-1917. Boston, Ginn
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