. Botany of the living plant. Botany; Plants. INTRODUCTORY TO LAND-VEGETATION 455 The ovum of Land Plants cannot, as in Fucus and other aquatic plants, be safely extruded from the parent to fend for itself. An unprotected primordial cell would have a poor chance of if exposed to the drying influence of the air. The ova of the. Fig. 350. Archegonia of Polvpodium vulgare. A, still closed. o = ovum. K' = canal-cell, tf "^ventral canal-cell. B = an archegonium ruptured. ( x 240.) (After Strasburger.) Archegoniatae are accordingly retained within the tissue of the parent, and are pro
. Botany of the living plant. Botany; Plants. INTRODUCTORY TO LAND-VEGETATION 455 The ovum of Land Plants cannot, as in Fucus and other aquatic plants, be safely extruded from the parent to fend for itself. An unprotected primordial cell would have a poor chance of if exposed to the drying influence of the air. The ova of the. Fig. 350. Archegonia of Polvpodium vulgare. A, still closed. o = ovum. K' = canal-cell, tf "^ventral canal-cell. B = an archegonium ruptured. ( x 240.) (After Strasburger.) Archegoniatae are accordingly retained within the tissue of the parent, and are produced singly. The archegonium is in fact a nursing organ, and the constancy of its occurrence, with only minor differences of detail in the Bryophyta and Pteridophyta, may be taken as evidence how essential to survival of subaerial plants is the protection and nursing of the germ. It may be said generally for subaerial Animals. 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 Bower, F. O. (Frederick Orpen), 1855-1948; Wardlaw, C. W. (Claude Wilson), 1901-. London, Macmillan and Co. , ltd.
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