. Embryogenesis in plants. Embryology. Fig. 36. Embryogeny in heterosporous ferns A, PUulaiia globiilifera. Archegoniuni in longitudinal median section containing recently fertilised ovum; the archegoniuni (a) is shown in what is probably its natural orientation. B-D, Marsilea vestita. Stages in the development of the em- bryo, showing the differentiation of the shoot (,v), leaf (/), root (/•), and foot (/) regions; p, prothallus. E, Pilnlaria globiilifera. Fully developed embryo in , still attached to the prothallus and megaspore {in), and enclosed in the calyptra {cal)\ vs, vascular stra
. Embryogenesis in plants. Embryology. Fig. 36. Embryogeny in heterosporous ferns A, PUulaiia globiilifera. Archegoniuni in longitudinal median section containing recently fertilised ovum; the archegoniuni (a) is shown in what is probably its natural orientation. B-D, Marsilea vestita. Stages in the development of the em- bryo, showing the differentiation of the shoot (,v), leaf (/), root (/•), and foot (/) regions; p, prothallus. E, Pilnlaria globiilifera. Fully developed embryo in , still attached to the prothallus and megaspore {in), and enclosed in the calyptra {cal)\ vs, vascular strand; other lettering as before (semi-diagrammatic). F-J, A:olla filiciiloides. F, Young embryo as seen in of archegonium; the first partition wall, I-I, is obliquely vertical. G, H, Young embryos in in which the first wall is transverse to the archegonial axis: in H, the epibasal segment is forming the apices of the shoot and first leaf; the first root initial can be seen in one of the hypobasal quadrants, as in homosporous leptosporangiate ferns. J, Well-developed embryo in , after it has broken through the prothallus; lettering as before (all after Campbell). (A, x 300; B, C, x 525; D, x 260; E, x 75; F-H, x 350; J, X 100.). 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
Size: 1511px × 1654px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodiversi, booksubjectembryology
