Organography of plants, especially of the archegoniatae and spermaphyta . stega (Part I, Fig. 26) its capacity segment, nor is the whole surface of the segment, as in the Musci, devoted to the formation of theprimordium of the leaf. In the eusporangiate Filicineae pluricellular origin of the leaf-primordiummust take place. See p. 131. * We must remember that the leaves of all Musci primarily consist of one cell-layer, and thatwhere many layers are present, as is the case when nerves and the like are laid down, these aresubsequent formations. APICAL AND INTERCALARY GROWTH 307 disappears early,
Organography of plants, especially of the archegoniatae and spermaphyta . stega (Part I, Fig. 26) its capacity segment, nor is the whole surface of the segment, as in the Musci, devoted to the formation of theprimordium of the leaf. In the eusporangiate Filicineae pluricellular origin of the leaf-primordiummust take place. See p. 131. * We must remember that the leaves of all Musci primarily consist of one cell-layer, and thatwhere many layers are present, as is the case when nerves and the like are laid down, these aresubsequent formations. APICAL AND INTERCALARY GROWTH 307 disappears early, but the cell itself retains its form for some time. We see inFig. 26 of Part I, on the right, that already the apical cell of the leaf-primor-dium, which consists of thirteen cells, has grown out to some extent—anindication that it has expended its capacity for division, and that its phaseof elongation has now set in ;but in the basal portion of theprimordium, which is stillsmall, as we may see by a com-parison with the figure stand-ing on the left, the cell-division.
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