. Foundations of botany. Fig. 178. — Conjugation of Cells of Green Algae. (Much magnified.) f. Conjugation of Desmids. ^, a single plant in its ordinary condition ; jB, emptycell-wall of another individual; C, conjugation of two individuals to form aspore by union of their cell-contents. II. Conjugation of Spirogyra. A, two filaments of Spirogyra side by side, withthe contents of adjacent cells uniting to form spores, z. At the bottom of thefigure the process is shown as beginning at the top as completed, and the cellsof one filament emptied ; B, a single filament of another kind of Spirogyra,
. Foundations of botany. Fig. 178. — Conjugation of Cells of Green Algae. (Much magnified.) f. Conjugation of Desmids. ^, a single plant in its ordinary condition ; jB, emptycell-wall of another individual; C, conjugation of two individuals to form aspore by union of their cell-contents. II. Conjugation of Spirogyra. A, two filaments of Spirogyra side by side, withthe contents of adjacent cells uniting to form spores, z. At the bottom of thefigure the process is shown as beginning at the top as completed, and the cellsof one filament emptied ; B, a single filament of another kind of Spirogyra,containing two spores, one lettered z. {A magnified 240 diameters, B 150diameters.) a period of rest, a new individual develops. In Spirogyra eachcell of the filament appears to be an individual and can conjugatelike the one-celled desmids. It is not easy to watch the process,since the spore-formation takes place at night. It is possible, 244 FOUNDATIONS OF BOTANY however, to retard the occurrence of conjugation by lea
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplants, bookyear1901
