Elementary botany . hemselves to objectsfor support. (After Pringsheim.) i5o MORPHOLOG Y. forms two spermatozoids (sometimes only one) which are of the same form asthe zoogonidia but smaller, and yellowish instead of green. In some species a motile body intermedi-ate in size and color be-tween the spermatozoidsand zoogonidia is firstformed, which afterswimming around comesto rest on the oogonium,or near it, and developswhat is called a dwarfmale plant from whichthe real spermatozoid isproduced. PortJonhfdof cede- 318: 00S°ni»- - The gonium showing upper half oogonia are formed di-of egg open,
Elementary botany . hemselves to objectsfor support. (After Pringsheim.) i5o MORPHOLOG Y. forms two spermatozoids (sometimes only one) which are of the same form asthe zoogonidia but smaller, and yellowish instead of green. In some species a motile body intermedi-ate in size and color be-tween the spermatozoidsand zoogonidia is firstformed, which afterswimming around comesto rest on the oogonium,or near it, and developswhat is called a dwarfmale plant from whichthe real spermatozoid isproduced. PortJonhfdof cede- 318: 00S°ni»- - The gonium showing upper half oogonia are formed di-of egg open, and a sperma- ,, j. r ,, tozoid ready to enter. (After rectl7 from One of theKlebahn). vegetative cells. Inmost species this cell first enlarges in diameter, so that it is easily detected. Theprotoplasm inside is the egg cell. The oogonium wall opens, a bit of theprotoplasm is emitted, and the spermatozoid then enters and fertilizes it(fig. 148). Now a hard brown wall is formed around it, and, just as in spirogyra. Fig. of threado f oedogoniumshowing antheridia
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