. Elementary botany. Botany. 102 MORPHOLOGY. forms two spermatozoids (sometimes only one) which are of the same form as the zoogonidia but smaller, and yellowish instead of green. In some species a motile body intermedi- ate in size and color be- tween the spermatozoids and zoogonidia is first formed, which after swimming around comes to rest on the oogonium, or near it, and develops what is called a "dwarf male plant " from which the real spermatozoid is produced. Portion of thread of oedo- ' ° gonium showing upper half oogonia are formed di- of egg open, and a sperma- ,, r r Al toz
. Elementary botany. Botany. 102 MORPHOLOGY. forms two spermatozoids (sometimes only one) which are of the same form as the zoogonidia but smaller, and yellowish instead of green. In some species a motile body intermedi- ate in size and color be- tween the spermatozoids and zoogonidia is first formed, which after swimming around comes to rest on the oogonium, or near it, and develops what is called a "dwarf male plant " from which the real spermatozoid is produced. Portion of thread of oedo- ' ° gonium showing upper half oogonia are formed di- of egg open, and a sperma- ,, r r Al tozoid ready to enter. (After rectly f™m one of the Oltmans). vegetative cells. In most species this cell first enlarges in diameter, so that it is easily detected. The protoplasm inside is the egg cell. The oogonium wall opens, a bit of the protoplasm is emitted, and the spermatozoid then enters and fertilizes it (fig. 99). Now a hard brown wall is formed around it, and, just-as in spirogyra. Fig. 98. Portion of thread O f cedogonium showing antheridia. 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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