Elementary botany . Fig. sessilis ; oogonium opening and emit-ting a bit of protoplasm; spermatozoids; sperma-tozoids entering oogonium. (After Pringsheim andGoebel.) VA UCHERIA. 145 fertilized egg (sometimes called here the oospore). It is freedfrom the oogonium by the disintegration of the latter, sinks into. Fig. in vaucheria. inn, male nucleus ; fn, female nucleus. Male nucleus enteringthe egg and approaching the female nucleus. (After Oltmans.) the mud, and remains here until the following autumn or spring,when it grows directly into a new plant. 305. Ferti
Elementary botany . Fig. sessilis ; oogonium opening and emit-ting a bit of protoplasm; spermatozoids; sperma-tozoids entering oogonium. (After Pringsheim andGoebel.) VA UCHERIA. 145 fertilized egg (sometimes called here the oospore). It is freedfrom the oogonium by the disintegration of the latter, sinks into. Fig. in vaucheria. inn, male nucleus ; fn, female nucleus. Male nucleus enteringthe egg and approaching the female nucleus. (After Oltmans.) the mud, and remains here until the following autumn or spring,when it grows directly into a new plant. 305. Fertilization.—Fertilization is accomplished by thespermatozoids swimming in at the open end of the oogonium, xt£&£&*%k ,#\. Wm KHtn *^\ *r Fig. of vaucheria. /«, female nucleus; /««, male nucleus. The different figuresshow various stages in the fusion of the nuclei. when one of them makes its way down into the egg and fuseswith the nucleus of the egg. 306. The twin vaucheria (V. geminata).—Another species of vaucheriais the twin vaucheria. This is also a common one, and may be used forjtudy instead of the sessile vaucheria if the latter cannot be obtained. Thesexual organs are borne at the end of a club-shaped branch. There areusually two oogonia, and one antheridium between them which
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