. Embryogenesis in plants. Embryology. Fig. 13. Liverworts: segmentation of the zygote and development of the sporophyte in the three principal groups A, Anthocerotales. B, Marchantiales. C, Jungermanniales. I-Ij, the first partition wall of the zygote. In the Marchantiales, Meyer distinguishes filamentous and quadrant types, the latter being held to be derivative. (After Miiller). embedded in the tissue of the gametophyte. The fertilised egg is there- fore unlikely to be affected by compression due to the contiguity of prothallial tissue, (though it might be by the stout venter wall), while e
. Embryogenesis in plants. Embryology. Fig. 13. Liverworts: segmentation of the zygote and development of the sporophyte in the three principal groups A, Anthocerotales. B, Marchantiales. C, Jungermanniales. I-Ij, the first partition wall of the zygote. In the Marchantiales, Meyer distinguishes filamentous and quadrant types, the latter being held to be derivative. (After Miiller). embedded in the tissue of the gametophyte. The fertilised egg is there- fore unlikely to be affected by compression due to the contiguity of prothallial tissue, (though it might be by the stout venter wall), while effects of gradients, other than those of gaseous concentration, must be exercised by way of the stalk. That metabolic gradients determine or affect the position and formation of the archegonia as well as embryo- genesis seems probable, but the relevant facts have still to be 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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