. Studies in fossil botany . Paleobotany. CORDAITEAE 533 a strong sheath, which abuts, above and below, on a hypodermal strand of fibres. Smaller hypodermal ribs. Fir,. 192.—CordetUes, Leaves in transverse section. A. C. anguldsostriatus ('?), //, /, hypodermal ribs of sclerenchyma; j>, mesophyll ; </, bundle-sheath; a, centripetal \ylem ; /, protoxylem ; &. centrifugal xyletn ; c, phloem ;_/J tissue connecting the bundles. x 60. B. C. rhombinervis. Here the ribs of sclerenchyma only occur in connection with the bundles ; palisade-tissue and spongy parenchyma are differen- tiated. X
. Studies in fossil botany . Paleobotany. CORDAITEAE 533 a strong sheath, which abuts, above and below, on a hypodermal strand of fibres. Smaller hypodermal ribs. Fir,. 192.—CordetUes, Leaves in transverse section. A. C. anguldsostriatus ('?), //, /, hypodermal ribs of sclerenchyma; j>, mesophyll ; </, bundle-sheath; a, centripetal \ylem ; /, protoxylem ; &. centrifugal xyletn ; c, phloem ;_/J tissue connecting the bundles. x 60. B. C. rhombinervis. Here the ribs of sclerenchyma only occur in connection with the bundles ; palisade-tissue and spongy parenchyma are differen- tiated. X 50. C. C, lingulatus. Ribs as in E; palisade-tissue well marked. X 50. All after Renault. are interposed between the vascular bundles. The bundle-sheaths are connected together laterally by transverse bridles of thickened cells, which may perhaps. 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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