. Studies in fossil botany . Paleobotany. 38 STUDIES IN FOSSIL BOTANY classes of Pteridophyta will be emphasised in later chapters. 5- The Leaves.—The leaves of the Calamarieae were in all cases arranged in whorls, and were usually of a simple acicular or lanceolate form, though in the genus Archaeocalamites they were forked (Figs. 30, 31). It is often stated that the leaves of the Palaeozoic Equisetales differed from those of their later successors in being. Fig. 12.—Catamites, sp. Transverse fracture through a node, showing leaf-sheath and free tips of leaves, each with its vein. Commissural
. Studies in fossil botany . Paleobotany. 38 STUDIES IN FOSSIL BOTANY classes of Pteridophyta will be emphasised in later chapters. 5- The Leaves.—The leaves of the Calamarieae were in all cases arranged in whorls, and were usually of a simple acicular or lanceolate form, though in the genus Archaeocalamites they were forked (Figs. 30, 31). It is often stated that the leaves of the Palaeozoic Equisetales differed from those of their later successors in being. Fig. 12.—Catamites, sp. Transverse fracture through a node, showing leaf-sheath and free tips of leaves, each with its vein. Commissural bundles also shown, x about 2. From a specimen in the possession of Mr. Parker of Rochdale. (G. T. G.) free, and not united to form a sheath. It is no doubt true that the free laminae were much more developed in the Calamarieae than in recent Horsetails, but in several cases there is good evidence for the presence of a coherent sheath at the base. This is clearly shown in Fig. 12, which represents the node of a Calamite, exposed in transverse fracture on the surface of the matrix. The greater part of the whorl of leaves is shown, and they are evidently united into a continuous. 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 Scott, Dukinfield Henry, 1854-1934. London, A. and C. Black
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