. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 151 frequently greatly elongated. It is bounded by a wall and within is the living substance or protoplasm. The more important parts of the living substance are a viscid rather watery material termed the cytoplasm and a minute denser body, the nucleus, which is immersed in the cytoplasm. A spore is a special kind of cell. Fig. 89. Fig. 90. Fig. 89. Mobile phase in life of slime mould: A, group of spores. B, germination of a spore. C, two forms of zoospores greatly enlarged. The right-hand one mobile owing to a streaming movement
. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 151 frequently greatly elongated. It is bounded by a wall and within is the living substance or protoplasm. The more important parts of the living substance are a viscid rather watery material termed the cytoplasm and a minute denser body, the nucleus, which is immersed in the cytoplasm. A spore is a special kind of cell. Fig. 89. Fig. 90. Fig. 89. Mobile phase in life of slime mould: A, group of spores. B, germination of a spore. C, two forms of zoospores greatly enlarged. The right-hand one mobile owing to a streaming movement of its protoplasm and the left-hand one moves about owing to the rapid movements of the cilium, c. D, association of the zoospores preliminary to the formation of a Plasmodium. -E, Plasmodium. The arrow indicates the direction of the streaming movement. Fig. 90. Character of the capillitium: A, in Arcyria. B, in Trichia, por- tion of thread enlarged on the left hand. that is capable of germinating under favorable conditions and producing a plant. In this case it is advisable when germinating the spores to place them in a nutrient solution made by boiling in water bits of wood upon which the sporangia were growing. Germination will begin in about one day. As the spore wall ruptures the contents escapes as a naked bit of protoplasm (Fig. 89, B) which possesses a singular power of motion. This motility is due either to the slow creeping or streaming motion. 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 Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisher, booksubjectbotany
