. Botany for high schools and colleges. Botany. CELL FOBMATLON BY UNION: 47 masses come in direct contact by means of a tube (the pol> len tube) which touches with its lower extremity the embry- onic yesicle. {a) The foregoing classification of tlie modes of cell-formation differs in many respects from tliat given by Sachs in the fourth edition of his ''*; His classification as there given is as follows :. Fig. ^%. — Vaucheria sessilis. A, origin of the lateral branches, oq (oogonium), and h iantheridium), from the filament ,• B. the branch a (the same as // in ^1) has it* ter
. Botany for high schools and colleges. Botany. CELL FOBMATLON BY UNION: 47 masses come in direct contact by means of a tube (the pol> len tube) which touches with its lower extremity the embry- onic yesicle. {a) The foregoing classification of tlie modes of cell-formation differs in many respects from tliat given by Sachs in the fourth edition of his ''*; His classification as there given is as follows :. Fig. ^%. — Vaucheria sessilis. A, origin of the lateral branches, oq (oogonium), and h iantheridium), from the filament ,• B. the branch a (the same as // in ^1) has it* ter- minal portion cut off by a partition ; in Of7 the protoplasm is becoming greatly con- densed ; C, the same as oq of B. but further advanced (now called an oosphere) and the wall burst open, permitting the escape of a drop of protoplasm sZ; D, small motile cells (spermatozoids) from the terminal cell of a in B ; U, the same as C, but a lit'le later—the spermatozoids are entering throueh the opening ; F, a, the branch a in B, with the terminal cell now empty, on account of the escape of the spermatozoids ; osp, the same as E, and og in B, after union with the spermatozoids—the protoplasm is surrounded by a thicK: cell-wall and it is now called an oospore. X 100.—After Sachs. A.—Formation of Reproductive Cells 1. Rejuvenescence. 2. Conjugation. 3. Free Cell-Formation. 4. Formation of Reproductive Cells by Division, which is made to mclude the formation of pollen, the spores of mosses and ferns, and the conidia, stylospores, and basidiospores of many 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 Edwin, 1845- [from old catalog]. New York, H. Holt and company
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