Organography of plants, especially of the archegoniatae and spermaphyta . dder Anlageder Gefiissbiindel, in Flora, Ixxxv (1898). VENATION OF DICOTYLEDONES 343 Caltha palustris. We may compare with the case of Acer platanoidesthat of the unsegmented leaf of Caltha palustris. The chief veins radiateoutwards here also from the base of the lamina (Fig. 222), and on themargin of the lamina there are insignificant projections. These arise rela-tively much later than the lobes in the leaves of Acer. The course of theveins depends upon the fact that the lamina which comes off from the thickleaf-stalk
Organography of plants, especially of the archegoniatae and spermaphyta . dder Anlageder Gefiissbiindel, in Flora, Ixxxv (1898). VENATION OF DICOTYLEDONES 343 Caltha palustris. We may compare with the case of Acer platanoidesthat of the unsegmented leaf of Caltha palustris. The chief veins radiateoutwards here also from the base of the lamina (Fig. 222), and on themargin of the lamina there are insignificant projections. These arise rela-tively much later than the lobes in the leaves of Acer. The course of theveins depends upon the fact that the lamina which comes off from the thickleaf-stalk at a very early period develops, uniformly and without preferencefor any definite direction of growth, into a surface with its margins Fig. 246 the leaf is still entirely embryonal, only at the position whichcorresponds to the base of the lamina intercellular spaces appear. Its con-figuration, however, has in essentialsbeen reached. The veins appearrelatively late and radiate from theleaf-base in correspondence with thenearly uniform growth of the surface \.
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