. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. 36o STAMENS A single vascular bundle traverses filament and connective. In the vast majority of cases the anther bears four pollen sacs, two on cither side of the connective (Fig. 209, A), although the staniens of the MaUow-family (Malvace»), for instance, have but two pollen sacs. In transverse sections through verj' J'oung immature flower-buds, the anthers are seen to consist of uniform. Fig. 20(j.—Development of the anther. A, Section of rather more than half the anther of a young stamen, showing the jjoll
. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. 36o STAMENS A single vascular bundle traverses filament and connective. In the vast majority of cases the anther bears four pollen sacs, two on cither side of the connective (Fig. 209, A), although the staniens of the MaUow-family (Malvace»), for instance, have but two pollen sacs. In transverse sections through verj' J'oung immature flower-buds, the anthers are seen to consist of uniform. Fig. 20(j.—Development of the anther. A, Section of rather more than half the anther of a young stamen, showing the jjollen-sacs at the mother-cell stage (the mother-cells are seen in various phases of division). B, Section of young anther before the archesporia are differentiated. C and D, Later stages, a., dividing archcsporial cells ; £p., epiderniis of anther ; /., fibrous layer ; Jil., filament ; , middle layer ; I., tapetum ; , vascular bundle of connective. (A original, the remainder after Warming.) thin-walled tissue bounded by a distinct epidermis, whilst a slight lobing foreshadows the future pollen sacs (Fig. 200, B). At a slightly later stage four subepidermal strips of \'ar)'ing width (often of only a single cell) become distinguishable, one in each lobe; these strips consist of cells with prominent nuclei and dense contents and constitute the archesporia (Fig. 209, C. a.), each of which extends as a narrow band of tissue for almost the %\'hoJe. 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 Fritsch, Felix Eugene, 1879-; Salisbury, E. J. (Edward James), Sir, b. 1886. London, G. Bell and sons ltd.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpl, booksubjectplants
