. Elementary botany. Botany. Fig. 100. Male nucleus just entering egg at left side. Figs. 100-102.—. Fig. 101. Fig. 102. Male nucleus fusing with The two nuclei fused, and female nucleus. fertilization complete. Fertilization in cedogonium. (After Oltmans^. and vaucheria, it passes through a resting period. At the time of germination it does not produce the thread-like plant again directly, but first forms four zoospores exactly like the zoogonidia (fig. 103). These zoospores then germinate and form the plant. 244. (Edogonium compared with spirogyra.—Now if we compare cedo- gonium with spirogy
. Elementary botany. Botany. Fig. 100. Male nucleus just entering egg at left side. Figs. 100-102.—. Fig. 101. Fig. 102. Male nucleus fusing with The two nuclei fused, and female nucleus. fertilization complete. Fertilization in cedogonium. (After Oltmans^. and vaucheria, it passes through a resting period. At the time of germination it does not produce the thread-like plant again directly, but first forms four zoospores exactly like the zoogonidia (fig. 103). These zoospores then germinate and form the plant. 244. (Edogonium compared with spirogyra.—Now if we compare cedo- gonium with spirogyra, as we did in the case of vaucheria, we will find here also that there is an advance upon the simple condition which exists in spiro- gyra. Growth and division of the thread is limited to certain portions. The sexual organs are differentiated. They usually differ in form and size from the vegetative cells, though the oogonimn is simply a changed vegetative. 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 Atkinson, George Francis, 1854-1918. New York, H. Holt and company
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