. Essentials of botany. Botany; Botany. 216 ESSENTIALS OF BOTANY OSCILLATORIA, — ONE OF THE BLUE-GREEN ALG^ 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 : (o) The color. (b) The filaments radiating from the rather compact mass of the pl
. Essentials of botany. Botany; Botany. 216 ESSENTIALS OF BOTANY OSCILLATORIA, — ONE OF THE BLUE-GREEN ALG^ 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 : (o) The color. (b) The filaments radiating from the rather compact mass of the plants. 275. Minute Structure. — With note: (a) The shape of the filaments. Are they branched ? (i) Their movements. Describe these. Sketch several filaments. With note: (c) The shape of the tip of a filament. (d) 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. F:g. 150. Gloeocapsa, one of the Lowest of the Bhie- Green Algae, (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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