. Bulletin of the New York Botanical Garden. New York Botanical Garden; Plants. (87) other aquatic plants. At the same time this contraction also serves to secure the anchorage of specimens which have lodged in the mud and penetrated it, and to draw the bulbil down into the loose soil when germination takes place on land. The apical bud becomes apogeotropic soon after germination after the manner of a rhizome rather than of the bran< h, and its upward curvature disturbs tin- balance of a floating bulbil in such man- ner that it turns over with the result thai the bud is directed downward. I
. Bulletin of the New York Botanical Garden. New York Botanical Garden; Plants. (87) other aquatic plants. At the same time this contraction also serves to secure the anchorage of specimens which have lodged in the mud and penetrated it, and to draw the bulbil down into the loose soil when germination takes place on land. The apical bud becomes apogeotropic soon after germination after the manner of a rhizome rather than of the bran< h, and its upward curvature disturbs tin- balance of a floating bulbil in such man- ner that it turns over with the result thai the bud is directed downward. It is soon turned upward, however, by .1 re- verse curvature and this process is re- peated many times until anchorage is secured (Fig. 6). The bulbil retains its general relations in polarity by forming roots from tin- basal end primarily and developing tin- apical bud most readily. Modifications amounting to direct reversal o! these re- lations may be made by external condi- tions however. Any one of the grow- ing points in the axils of the bracts may be forced to grow and develop the main axis of a new plant, or the bulbil may be cut into several portions, each of which may give rise to a new plant. Fig. 7. Advanced stage perhaps the most interesting feature of germination of bulbil . ,. .. , .⢠, ... ta. of the history of the bulbils is the tact which is being converted 1/x ""â ' ' J into a rhizome. Actual that they do not perish in gel mi mil ion size. an(l Jn giving rise to a new individual. Bulbs and other modified stems generally consist of a mass of tissue which has reached its full development, while the power of extended growth is retained only by certain generative le- gions. New shoots are formed by the growth of these points and food for their nourishment is withdrawn from the storage tissues of the bulb which soon breaks down and does not par- ticipate further in the history of the new Please note that these images are extracted from sc
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