Text-book of botany, morphological and physiological . Fig. 257.—.-/« Capillus-Vencris ; vertical longitudinalsection through the prothallium // and the young Fern £:k root-hairs, a archegonia of the prothallium, * the first leaf,w the first root of the young plant (X about 10). FIG. ?2-^9,.—Adiantuiii CapUlus-Veneris; the // seen from below with the young Fernattached to it ; b its first leaf; w iv its first andsecond roots; /z root-hairs of the prothallium (X about30). If we neglect for the moment the points which are still doubtful in the signi-ficance of each of the first four
Text-book of botany, morphological and physiological . Fig. 257.—.-/« Capillus-Vencris ; vertical longitudinalsection through the prothallium // and the young Fern £:k root-hairs, a archegonia of the prothallium, * the first leaf,w the first root of the young plant (X about 10). FIG. ?2-^9,.—Adiantuiii CapUlus-Veneris; the // seen from below with the young Fernattached to it ; b its first leaf; w iv its first andsecond roots; /z root-hairs of the prothallium (X about30). If we neglect for the moment the points which are still doubtful in the signi-ficance of each of the first four cells of the embryo, it is certain that one of themwhich is inferior^ and posterior becomes the mother-cell of the first root, and thatthe apical cell of the stem lies immediately in front of and above the base of the leaf. * The terms posterior, anterior, superior, inferior, refer also to the prothallium, the apex ofwhich is turned in front, and its archegonia-bearing surface downwards. ;4-> VASCULAR CRYPTOGAMS. and that
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1875
