. Studies in fossil botany . Paleobotany. CORDAITEAE 527 The secondary wood has essentially the structure of that of Araucaria, and was hence named Araucarioxylon by Kraus,1 a name which is now superfluous in cases where the connection with Cordaites has been estab- lished. The bordered pits, which are limited to the radial walls, are usually in two or more rows, and are. -Srf2d If â fc8?C*A m Fig. 189. â Cordaites, sp. Part of transverse section of a stem, from the English Coal- measures, p, pith ; x, zone of wood ; ph, phloem ; //, double leaf-trace, each bundle subdividing ; c, cortex, cont
. Studies in fossil botany . Paleobotany. CORDAITEAE 527 The secondary wood has essentially the structure of that of Araucaria, and was hence named Araucarioxylon by Kraus,1 a name which is now superfluous in cases where the connection with Cordaites has been estab- lished. The bordered pits, which are limited to the radial walls, are usually in two or more rows, and are. -Srf2d If â fc8?C*A m Fig. 189. â Cordaites, sp. Part of transverse section of a stem, from the English Coal- measures, p, pith ; x, zone of wood ; ph, phloem ; //, double leaf-trace, each bundle subdividing ; c, cortex, containing sclerenchymatous strands. X about 6. S. Coll. 306. (G. T. G.) densely crowded in alternating series, the borders thus having a hexagonal outline (Fig. 190, B, bt). In good material, the pore of the pit can be recognised clearly, and has the form of an inclined elliptical slit. Certain variations in the diameter of the tracheides of successive zones were regarded by Renault as indicating periods 1 The names Dadoxylon, of Endlicher, and Araucarites, of Goppert, are often used in the same sense as Araucarioxylon. Dadoxylon is prefer- able in so far as it does not suggest any affinity with the 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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