. The elements of structural botany [microform] : with special reference to the study of Canadian plants, to which is added a selection of examination papers. Plant anatomy; Botany; Plantes; Botanique. /,/V^^^"*^^^'^ /V '-^^. uaves, in the EXAMINATION OF A MOSS. 193 stem with several archegonia in the centre, and Fig. 243 shows a single archegoniuiu very highly magnified. The antherozoids upon being set free make their way down the necks of the Jtrchegonia, and unite their substance with that of special cells in the lower end (one in each archegonium). These cells, as a consequence of bei
. The elements of structural botany [microform] : with special reference to the study of Canadian plants, to which is added a selection of examination papers. Plant anatomy; Botany; Plantes; Botanique. /,/V^^^"*^^^'^ /V '-^^. uaves, in the EXAMINATION OF A MOSS. 193 stem with several archegonia in the centre, and Fig. 243 shows a single archegoniuiu very highly magnified. The antherozoids upon being set free make their way down the necks of the Jtrchegonia, and unite their substance with that of special cells in the lower end (one in each archegonium). These cells, as a consequence of being thus fertilized, become sur- rounded by a thin coat and immediately begin to grow up- wards, developing the slender stalks (setiv) with the capsules at the summit, and surmounted by the calyptra, which is, in fact, nothing but the wall of the archegonium which is torn away at its base and carried upwards. Then the ^Ai spores are developed around the columella, and the round of life of the plant is com- pleted. As in the Ferns, we have here also exhibited an alternation of generations, the one generation being that arising from the ^ Fig. 243. development of the spore and resulting in the production of the autheridia and the archegonia; the other being that arising from the fertilization of the Fig. 242.—Enlarged view of apex of the fertile stem of a Moss; a, archegonia; b, leaves. Fig. 243.—Very highly magtiifled view of an archegonium; b, the base; h, the nec-k ; m, the mouth ; the germ-cell ia seen at the bottom of the flask- shaped cavity. (Sachs.) ,. 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 Spotton, H. B. (Henry Byron), 1844-1933. Toronto : W. J. Gage
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Keywords: ., book, bookcentury1800, booksubjectbotany, booksubjectplantanatomy
