A morphological study of some members of the genus Pallavicinia . Fig. 21. A. Upper part of the capsule of Pallavicinia radiculosa, showing first stages of division in the spore Stages in the mitosis of the spore mother-cells in P. radiculosa, x 640. F. Spore mother-cell of P. Zollingeri, x 640. G. Spore mother-cell of P. Levieri, x 640. H-J. Ripe spores and part of an elater of P. radiculosa. 36 GENUS PALLAVICINIA the capsule, which is elongated oval in outline, being about 4 mm. inlength by mm. in breadth. The ripe capsule opens by four longitudinalslits, but the apical
A morphological study of some members of the genus Pallavicinia . Fig. 21. A. Upper part of the capsule of Pallavicinia radiculosa, showing first stages of division in the spore Stages in the mitosis of the spore mother-cells in P. radiculosa, x 640. F. Spore mother-cell of P. Zollingeri, x 640. G. Spore mother-cell of P. Levieri, x 640. H-J. Ripe spores and part of an elater of P. radiculosa. 36 GENUS PALLAVICINIA the capsule, which is elongated oval in outline, being about 4 mm. inlength by mm. in breadth. The ripe capsule opens by four longitudinalslits, but the apical cap remains entire, so that the four valves betweenthe slits remain together at the apex (Fig. 20, B). The ripe spores(Fig. 20, C) measure about 140. in diameter, and the outer surface iscovered with closely set blunt papillae, with somewhat expanded outer. Fig. 22. Pallavicinia Levieri. A-C. Young sporophytes. A and B still included within the calyptra; C, after breaking Section of upper part of the capsule, highly magnified. METHODS 37 ends. The elaters have two spiral bands. The one figured, whichmeasured 150^1 in length, was somewhat shorter than the majority ofthem. The mature sporophyte of P. radiculosa differs from that of in its shorter seta, which, according to Schiffner [1], is only15-20 mm. in length. The capsule, however, is much longer than in , but almost perfectly cylindrical in form, scarcely exceedingin width the seta (Fig. 23, D). As already stated, also, the apex isconspicuously pointed. It opens in the same way, by four narrow valves,united at the apex. Except at the pointed apex, the wall of the capsuleis composed of three layers of cells, of which the outer one has the cell-walls uniformly thickened, and dark colored. The markings on the ripespores form a network of delicate ridge
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Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910
