. Embryogenesis in plants. Embryology. EMBRYOGENESIS IN FLOWERING PLANTS 279 of distended cells, sometimes irregularly disposed, and containing many nuclei. These cells are described as having a haustorial function. The upper region of the suspensor, which is derived from a tier of the embryonic region, consists of two tiers of uninucleate cells. These have. Fig. 74. Various anomalous embryos A, B, Sciirrula atropurpurea. A, First division of zygote. B, Enlarged view of distal region of proembryo, showing beginning of elongation of suspensor cells (after Ranch). C, D, Balanophora abbreviata. C
. Embryogenesis in plants. Embryology. EMBRYOGENESIS IN FLOWERING PLANTS 279 of distended cells, sometimes irregularly disposed, and containing many nuclei. These cells are described as having a haustorial function. The upper region of the suspensor, which is derived from a tier of the embryonic region, consists of two tiers of uninucleate cells. These have. Fig. 74. Various anomalous embryos A, B, Sciirrula atropurpurea. A, First division of zygote. B, Enlarged view of distal region of proembryo, showing beginning of elongation of suspensor cells (after Ranch). C, D, Balanophora abbreviata. C, Two-celled embryo resulting from longitudinal division of zygote. D, A more advanced stage (after Zweifel). E-G, Scabiosa succisa. Stages in the development of the embryo (after Soueges). a staining reaction similar to the suspensor cells below, but they remain small and uninucleate and project in a foot-like manner into the lower portion of the suspensor, Fig. 75. In some embryos, however, the suspensor remains relatively undeveloped or it may be absent. Both types of suspensor may be observed in the same ovary. The proembryo, at first filamentous, becomes a globular mass, with irregular divisions, and this eventually develops into an elongated, spirally or irregularly lO. 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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Keywords: ., bookcentury1900, bookcollectionbiodiversi, booksubjectembryology
