. Devonian floras; a study of the origin of Cormophyta. Paleobotany -- Devonian. 32 THE PSILOPHYTON FLORA [CH. Ptilophyton. (Figs. 12-14.) Ptilophyton, Dawson^, 1878. Main axis (Fig. 12, p. 31) very stout, striated, (the Caulopteris ? Peachii of Salter 2; cf. also the genus Barrandeina) giving off stout lateral decurrent shoots almost at right angles. Branches covered with scale-like emergences. At the apex the axis is freely and closely alternate- ly branched, producing a tuft of shoots ^, the ends of which are circinately coiled (Fig. 18). The ramifications of this tuft bear, apparently on o
. Devonian floras; a study of the origin of Cormophyta. Paleobotany -- Devonian. 32 THE PSILOPHYTON FLORA [CH. Ptilophyton. (Figs. 12-14.) Ptilophyton, Dawson^, 1878. Main axis (Fig. 12, p. 31) very stout, striated, (the Caulopteris ? Peachii of Salter 2; cf. also the genus Barrandeina) giving off stout lateral decurrent shoots almost at right angles. Branches covered with scale-like emergences. At the apex the axis is freely and closely alternate- ly branched, producing a tuft of shoots ^, the ends of which are circinately coiled (Fig. 18). The ramifications of this tuft bear, apparently on one side, a row of long thin (? filamentous)obscure organs, the nature of which is unknown. They have been described as " tufts of linear bodies^." Distribution. Middle De- vonian, ? Bohemia; Upper Old Red, Scotland. This genus, markedly different from Psilophyton in habit, is still entirely ob- scure. We may note how- ever that what is probably 1 Dawson (1878). 2 Salter (1859), p. 407, Fig. 14 on p. 408; Kidston (1902) de- finitely states that Caulopteris Peachii, Salter, is the stem of Ptilophyton Thomsoni, Dawson. 3 Carruthers (1878), PI. Fig. 13. Ptilophyton Thomsoni, Dawson. The terminal portions of axes possessing emergences. Type specimen from the Upper Old Red of Scotland. (Reduced about |.) After Carruthers (1873).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Arber, E. A. Newell (Edward Alexander Newell), 1870-1918; Arber, Agnes Robertson, 1879-1960. Cambridge, The University Press
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