A morphological study of some members of the genus Pallavicinia . Fig. i. A. Male plant of Pallavicima (Mittenia) Zollingeri. x 2. B. Sterile plant of P. radiculosa, natural size; r, ventral branch. One of these secondary apical cells begins active growth and givesrise to the shoot which continues the sympodium. It grows horizontallyfor a time, but finally turns upward and develops into the next uprightgreen frond. Several segments are cut off from the apical cell beforea differentiation of the different tissues of the shoot is apparent. Finallythe midrib and lateral wings can be distinguished
A morphological study of some members of the genus Pallavicinia . Fig. i. A. Male plant of Pallavicima (Mittenia) Zollingeri. x 2. B. Sterile plant of P. radiculosa, natural size; r, ventral branch. One of these secondary apical cells begins active growth and givesrise to the shoot which continues the sympodium. It grows horizontallyfor a time, but finally turns upward and develops into the next uprightgreen frond. Several segments are cut off from the apical cell beforea differentiation of the different tissues of the shoot is apparent. Finallythe midrib and lateral wings can be distinguished, and in the former thecentral strand of elongated cells appears. Thus, at the base of the shoot, 8 GENUS PALLAVICINIA the conducting tissue is absent, and there is no connection between it andthat of the older shoot from which the branch has arisen (Fig. 2, B).
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Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910
