Text-book of botany, morphological and physiological . Fig. 130.—Dichotomy of the root of Isoetes laciistris (afterHofineister) (X400); //the apical cells of the branches; ?whthe old root-cap formed before the bifurcation ; ivhl the tworoot-caps of the branches, still covered by the former one; eepidermis ;/parenchyma ; ryfibro-vascular bundles of the FIG. 131.—Part of a male flower of Ricinus cotnmumscut through lengthways ; // the basal portions of thecompouiidly branched stamens; a their anthers. (c) Leaves. Repeated bifurcations proceeding apparently from true dichotomyoccur in the
Text-book of botany, morphological and physiological . Fig. 130.—Dichotomy of the root of Isoetes laciistris (afterHofineister) (X400); //the apical cells of the branches; ?whthe old root-cap formed before the bifurcation ; ivhl the tworoot-caps of the branches, still covered by the former one; eepidermis ;/parenchyma ; ryfibro-vascular bundles of the FIG. 131.—Part of a male flower of Ricinus cotnmumscut through lengthways ; // the basal portions of thecompouiidly branched stamens; a their anthers. (c) Leaves. Repeated bifurcations proceeding apparently from true dichotomyoccur in the leaves of the Fern Platyceriiim alckorne -; and, according to an older state-ment of Hofmcister, it appears that the branching of Fern-leaves generally com-mences dichotomously, although mature leaves mostly resemble a monopodium. On amid-rib forming a continuation of the rachis are placed numerous alternating lobes, orsecondary mid-ribs with secondary lacinicP. Since these branches are apparently alwaysalternate and not opposite, and the terminal lobes of the leaves are frequently developedas equally strong bifurcations, leaves of this kind may be considered, according to Hof-meisters hypothesis, as dichotomies developed in a sympodial (and indeed a scorpioid)manner, the mid-rib representing the sympodium and the apparent lateral branchlets thewea
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1875
