. Studies in fossil botany . Paleobotany. CHEIROSTROBEAE 119 of the wood was evidently centripetal,1 as in Spheno- phyllum or in the Lycopodiaceae. The rest of the tracheae bear multise,riate bordered pits, as is com- monly the case in Sphenophyllum. There was no. Fig. 51.—Cheirostrobus pettycurcnsis. Transverse section of axis of cone, x, xylem with twelve prominent angles; It, leaf-traces, one undivided, the other divided into three ; l&, leaf-trace, already divided into four bundles, and the inner one subdividing ; sp, bases of sporophylls; sm, sporangia. X about 8. Phil. Trans., S. Kid
. Studies in fossil botany . Paleobotany. CHEIROSTROBEAE 119 of the wood was evidently centripetal,1 as in Spheno- phyllum or in the Lycopodiaceae. The rest of the tracheae bear multise,riate bordered pits, as is com- monly the case in Sphenophyllum. There was no. Fig. 51.—Cheirostrobus pettycurcnsis. Transverse section of axis of cone, x, xylem with twelve prominent angles; It, leaf-traces, one undivided, the other divided into three ; l&, leaf-trace, already divided into four bundles, and the inner one subdividing ; sp, bases of sporophylls; sm, sporangia. X about 8. Phil. Trans., S. Kidston Coll. 84 A. pith, the wood extending to the centre of the stele, though intermixed with conjunctive parenchyma. The cortex presents no points worth special notice, except that it contained long sacs, perhaps of a secretory nature. The course of the leaf-trace bundles, however, is highly characteristic. They start from the angles 1 There is some evidence that a minute amount of primary xylem was developed centrifugally-. 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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