. Elementary botany . Fig. no. Fertilization in vaucheria. mn, male nucleus ; fn, female nucleus. Male nucleus entering the 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. 253. Fertilization.—Fertilization is accomplished by the spermatozoids swimming in at the open end of the oogonium, t'Y mm Fig. in. Fertilization of vaucheria. fn, female nucleus; mn, male nucleus. The different figures show various stages in the fusion of the nuclei. when one of them makes its way down into the
. Elementary botany . Fig. no. Fertilization in vaucheria. mn, male nucleus ; fn, female nucleus. Male nucleus entering the 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. 253. Fertilization.—Fertilization is accomplished by the spermatozoids swimming in at the open end of the oogonium, t'Y mm Fig. in. Fertilization of vaucheria. fn, female nucleus; mn, male nucleus. The different figures show various stages in the fusion of the nuclei. when one of them makes its way down into the egg and fuses with the nucleus of the egg. 254. The twin vaucheria (V. geminata).—Another species of vaucheria is the twin vaucheria. This is also a common one, and may be used for study instead of the sessile vaucheria if the latter cannot be obtained. The sexual organs arc borne at the end of a club-shaped branch. There are usually two oogonia, and one antheridium between them which terminates the branch. In a closely related species, instead of the two oogonia there is a whorl of them with the antheridium in the center. 255. Vaucheria compared with spirogyra. In vaucheria we have a plant which Is very interesting to compare with spirogyra in several respects.
Size: 3144px × 1590px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublisher, booksubjectbotany
