. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. 468 OPHIOGLOSSALES cotyledon, which is itself green and expanded, emerges upwards, while the axis is still further delayed than in O. vulgatum : it may be suggested that the latter has been slipped out from the prothallus owing to the early elongation of the base of the cotyledon, and so its original genetic connection is not easily followed, and its appearance comes to be like. Bolrycktum virghiianum, Sw. The upper figures show two embryos; the arrows show the direction of the archegonial neck. jr=sh
. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. 468 OPHIOGLOSSALES cotyledon, which is itself green and expanded, emerges upwards, while the axis is still further delayed than in O. vulgatum : it may be suggested that the latter has been slipped out from the prothallus owing to the early elongation of the base of the cotyledon, and so its original genetic connection is not easily followed, and its appearance comes to be like. Bolrycktum virghiianum, Sw. The upper figures show two embryos; the arrows show the direction of the archegonial neck. jr=shoot; y=root; ,/=foot; #=initial cell of shoot; &= initial cell of root. X 250. The lower figure shows an embryo more advanced ; s=stem ; ?-=root; c=cotyledon ; cal= calyptra. X50. (From Jeffrey.) that of an adventitious bud. Or possibly in this, as apparently in the type of O. pendulum, the primary axis may be arrested completely (a step in advance on the vulgatum-type), and the adventitious shoots described as originating on the root be actually such : in fact, early representatives of those so often found on the roots of the genus. But from the facts, as presented by Campbell, which are far from giving the complete develop- mental story, there does not appear to be sufficient reason to regard 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 Bower, F. O. (Frederick Orpen), 1855-1948. London, Macmillan and Co. , Ltd.
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