. Embryogenesis in plants. Embryology. 230 EMBRYOGENESIS IN PLANTS (b) not doing so. The terminal cell (i) may divide longitudinally, or (ii) transversely, either (a) not contributing to the suspensor or (b) con- tributing to it. The several possible developments of the basal and terminal cells may be combined in various ways. Now, if we begin with an elongating zygote in which the partition walls are laid down in general conformity with Errera's law of cell division by walls of minimal. Fig. 54. Capsella bursa-pastoris Later stages in the development of the embryo (after SchafTner). area (mod
. Embryogenesis in plants. Embryology. 230 EMBRYOGENESIS IN PLANTS (b) not doing so. The terminal cell (i) may divide longitudinally, or (ii) transversely, either (a) not contributing to the suspensor or (b) con- tributing to it. The several possible developments of the basal and terminal cells may be combined in various ways. Now, if we begin with an elongating zygote in which the partition walls are laid down in general conformity with Errera's law of cell division by walls of minimal. Fig. 54. Capsella bursa-pastoris Later stages in the development of the embryo (after SchafTner). area (modified in different species in relation to the gene-determined metabolites present), then the several patterns of development indicated above are what we might expect to find in a survey of a varied and considerable assemblage of species. THE SOUEGES SYSTEM OF CLASSIFICATION On the basis of extensive investigations of angiosperm embryos, Soueges has outlined a system of classification of embryonic develop- ment based on the mode of segmentation (in particular, see Soueges 1937, 1938, 1939, 1949, 1951). In this scheme four emhryonomic types are recognised: (1) fundamental types or archetypes; (2) secondary or derivative types; (3) superposed types; (4) irregular types. The first three are definable by the laws of embryonomy {see below), but the. 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 Wardlaw, C. W. (Claude Wilson), 1901-. London, Methuen; New York, Wiley
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