. Devonian floras; a study of the origin of Cormophyta. Paleobotany -- Devonian. Ill] PSILOPHYTON 25 sions of P. princeps^ (the nearly smooth type) from the Middle Old Red of Cromarty in Scotland, collected by the present author some years ago, appear to show indistinct indications of the emergences comparable to those of Rhynia and Halle's Fiff. 7. The proof of the identity of Psilophyton and Rhynia. («) Enlarged surface view of a petrified axis of Rliyiiia Givynne-Vaughani showing surface sculpture and several emergences ("the small projections or bulges" of Kidston and
. Devonian floras; a study of the origin of Cormophyta. Paleobotany -- Devonian. Ill] PSILOPHYTON 25 sions of P. princeps^ (the nearly smooth type) from the Middle Old Red of Cromarty in Scotland, collected by the present author some years ago, appear to show indistinct indications of the emergences comparable to those of Rhynia and Halle's Fiff. 7. The proof of the identity of Psilophyton and Rhynia. («) Enlarged surface view of a petrified axis of Rliyiiia Givynne-Vaughani showing surface sculpture and several emergences ("the small projections or bulges" of Kidston and Lang) ( x 14). After Kidston and Lang (1917). {b) Enlarged surface view of an impression of Psilophyton princeps showing surface sculpture and two emergences (the "spines" of Halle) ( x 16). After Halle (1916). It is thus we think clear that all known examples of P. princeps bore scales or spines, and the anatomy of these structures shows clearly that they are morphologically emergences and neither leaves nor branches. In many cases, however, especially near the apex of the shoots, these emergences are so small and ^ No. 25 Devonian Plant Coll., Sedgwick Museum, 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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