. Embryogenesis in plants. Embryology. Fig. 2. The first division of the zygote or spore in different groups A, Spirogyra velata, germinating zygospore (after West and Fritsch). B, Fitcus sp. (after Rostafinski). C, Polysiphonia alrorubescens, germinating tetraspore (after Chemin). D, Targionia hypophylla (after Campbell). E, Radiila sp. (after Leitgeb). F, Osmuuda claytoniaiia, germinating spore (after Campbell). G, AdiaiUiim concin- num, divided zygote (after Atkinson). H, Lycopodium phlegmaria (after Treub). J, Clienopodium bonus-hemiciis. K, Liiiida forsteri (after Soueges). prothallus) or
. Embryogenesis in plants. Embryology. Fig. 2. The first division of the zygote or spore in different groups A, Spirogyra velata, germinating zygospore (after West and Fritsch). B, Fitcus sp. (after Rostafinski). C, Polysiphonia alrorubescens, germinating tetraspore (after Chemin). D, Targionia hypophylla (after Campbell). E, Radiila sp. (after Leitgeb). F, Osmuuda claytoniaiia, germinating spore (after Campbell). G, AdiaiUiim concin- num, divided zygote (after Atkinson). H, Lycopodium phlegmaria (after Treub). J, Clienopodium bonus-hemiciis. K, Liiiida forsteri (after Soueges). prothallus) or gametophyte tissue (in seed plants). As this early establishment of a polarised axis has many consequences in the sub- sequent embryogenic development, it is evident how essential it is to have some knowledge of the factors which may bring it about. As early as 1878 Vochting, by dissecting plants into smaller and smaller segments, was able to demonstrate that every fragment possessed definite polarity (Vochting, 1878, 1884). As polarity was evident in even the smallest fragment this phenomenon would, by implication, extend to the individual cell. However, as later workers (Gocbel, 1908; Schwaritz, 1935) were to show, the polarity and morphogenetic be- haviour manifested by single cells or groups of cells depend on the fragment as a 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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