. Botany for high schools and colleges. Botany. Fig. 170.—Sexual orpntia of VaucTieria sessilis. A, beginning of the formation of the oogonium (oa) and antheii-'inm (?t) upon the branch ft. ^. later erage of the same, the antheridinm (a) now separated from the main branch (ft) by a transverse par- tition. O. an open oo2:oninm expelling a drop of mncilage. si. D, epermatozoids. M, spermatozoids collected at the mimth of the oogonium, F^ the antheridinm, a, col- lapsed after the escape of the spermiitozoids ; Ofip, the oospore. X about 100, except 2), which ismtich more.—C, 2), after Pringsheim,
. Botany for high schools and colleges. Botany. Fig. 170.—Sexual orpntia of VaucTieria sessilis. A, beginning of the formation of the oogonium (oa) and antheii-'inm (?t) upon the branch ft. ^. later erage of the same, the antheridinm (a) now separated from the main branch (ft) by a transverse par- tition. O. an open oo2:oninm expelling a drop of mncilage. si. D, epermatozoids. M, spermatozoids collected at the mimth of the oogonium, F^ the antheridinm, a, col- lapsed after the escape of the spermiitozoids ; Ofip, the oospore. X about 100, except 2), which ismtich more.—C, 2), after Pringsheim, the others after Sachs. (a) The formation of zoospores begins in tlie nigUt, they escape in the inorninn;, and the night following they germinate. (5) The formation of sexual organs begins in the evening, and is completed the next morning ; fertilization takes place during the day (from 10 to 4 ). (e) Good specimens of VaucJieria may be found clothing the boggy ground about many springs. Tlife bright green mats may be trans- ferred to the aquarium for the study of zoospores ; but for the sexual organs the dingy and dirty looking specimens must be 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 Bessey, Charles E. (Charles Edwin), 1845-1915. New York : H. Holt
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1885
