. Embryogenesis in plants. Embryology. Fig. 75. Embryogeny in Cuscuta reflexa A, Three-celled proembryo, with free endosperm nuclei; .?, haustorial synergid; pt, pollen tube. B, An older embryo; the basal region of the proembryo has developed into two large vesicular, coenocytic suspensor cells, b and c; the distal region has given rise to four tiers. C, A yet older stage, showing the distal embryonal mass. D, Proembryo with reduced vesicular suspensor; s, synergid; E, Proembryo with- out vesicular suspensor. F, G, Maturation of coiled embryo; .s7, shoot apex; ps, plumular scale; r, root; vs,
. Embryogenesis in plants. Embryology. Fig. 75. Embryogeny in Cuscuta reflexa A, Three-celled proembryo, with free endosperm nuclei; .?, haustorial synergid; pt, pollen tube. B, An older embryo; the basal region of the proembryo has developed into two large vesicular, coenocytic suspensor cells, b and c; the distal region has given rise to four tiers. C, A yet older stage, showing the distal embryonal mass. D, Proembryo with reduced vesicular suspensor; s, synergid; E, Proembryo with- out vesicular suspensor. F, G, Maturation of coiled embryo; .s7, shoot apex; ps, plumular scale; r, root; vs, vascular strand. (A-E, X 165; F, G, x 4; after Johri and Tiagi.) they consider that it properly belongs to the Solanad type. Tiagi (1951) has compared the embryological development of Cuscuta with that in non-parasitic species of Convolvulaceae, and considers that it should be removed to a separate family ( the Cuscutaceae), thus supporting a view already advanced by taxonomists. In the genus Cuscuta the genetical changes associated with the transition to the parasitic mode of life can be detected in various anomalous developments of 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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Keywords: ., bookcentury1900, bookcollectionbiodiversi, booksubjectembryology
