. Outlines of plant life : with special reference to form and function . Botany. VEGETATIVE REPRODUCTION. i8g set free by the rupture or by the solution of a portion of the enclosing wall (fig. 140). They may begin to move before the rupture of the wall, in accomplishing which their activity may materially assist. They then work their way out and swim freely in the water. After a time of movement they usually lose their cilia, either withdrawing them into the protoplasm or dropping them off, come to rest, and begin to grow into a new plant. 265. Non-motile spores are formed by all classes of l
. Outlines of plant life : with special reference to form and function . Botany. VEGETATIVE REPRODUCTION. i8g set free by the rupture or by the solution of a portion of the enclosing wall (fig. 140). They may begin to move before the rupture of the wall, in accomplishing which their activity may materially assist. They then work their way out and swim freely in the water. After a time of movement they usually lose their cilia, either withdrawing them into the protoplasm or dropping them off, come to rest, and begin to grow into a new plant. 265. Non-motile spores are formed by all classes of land plants without exception. They are often produced in great profusion, especially by the fungi, the mosses, the ferns, and the seed plants. 266. Form and food.—Their form is exceedingly various. Many are spherical or ovoid, while some are cylindrical or eo. Fig. 141.—Part of a vertical section of a leaf of a willow, attacked by a fungus {Melainp- sora salicina). eo. epidermis nf upper side lifted by the young teleuto-spores, t, de- veloping from the spore-bed above the ends of the paHsade cells of the host {par); eu, epidermis of the under side, broken rhrough by the spore-bed from which spring uredo-spores, it, and paraphyses, />. eo will also finally be ruptured to set free t. Magnified 260 diam.—After Prantl. even needle-shaped (figs. 141, 143, 166). Irregular forms, also, are not uncommon. The same plant may produce at. 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 Barnes, Charles Reid, 1858-1910. New York : Henry Holt and Company
Size: 1493px × 1674px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1900
