. Fossil plants : for students of botany and geology . Paleobotany. IX] PHYLLOTHECA. 285 pith, as in Catamites. In the Calamitean casts the ridges and grooves of each internode usually alternate in position with those of the next, as in Equisetum (fig. 54, A), but in Phyl- lotheca, Schizoneura and Archaeocalamites there is no such regular alternation at the nodes of the internodal vascular Fig. 67. Phyllotheca ? J nat. size. From a South African specimen of Permo-Carboniferous age in the British Museum. In Phyllotheca and Schizoneura there are no casts of' infra- nodal canals' below
. Fossil plants : for students of botany and geology . Paleobotany. IX] PHYLLOTHECA. 285 pith, as in Catamites. In the Calamitean casts the ridges and grooves of each internode usually alternate in position with those of the next, as in Equisetum (fig. 54, A), but in Phyl- lotheca, Schizoneura and Archaeocalamites there is no such regular alternation at the nodes of the internodal vascular Fig. 67. Phyllotheca ? J nat. size. From a South African specimen of Permo-Carboniferous age in the British Museum. In Phyllotheca and Schizoneura there are no casts of' infra- nodal canals' below each nodal line, but these are by no means always found in true Calamites. It is therefore practically impossible to determine the generic position of such fossils as that shown in fig. 67 without further evidence than is afforded by leafless casts. A few examples of Phyllotheca deliquescens have been. 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 Seward, A. C. (Albert Charles), 1863-1941. Cambridge : University Press
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