. Fossil plants : for students of botany and geology . Paleobotany. XXXIl] PEOTOPITYS 211 form of the bordered pits on the radial walls of the tracheids (fig. 462, D). The centre of the stem is occupied by a parenchy- matous pith, elliptical in transverse section, enclosed by a band s* ->-^^ era CD CDC OCX. CD ^ p8o â Pig. 462. Protopitys Buchiana. A, B. Central region of the stem showing the pith, the primary xylem (black in fig. A) and (A) the inner part of the secondary xylem; a, shoulders of xylem at the leaf-gaps; It leaf-trace; px protoxylem. C. Secondary, x', and primary xylem
. Fossil plants : for students of botany and geology . Paleobotany. XXXIl] PEOTOPITYS 211 form of the bordered pits on the radial walls of the tracheids (fig. 462, D). The centre of the stem is occupied by a parenchy- matous pith, elliptical in transverse section, enclosed by a band s* ->-^^ era CD CDC OCX. CD ^ p8o â Pig. 462. Protopitys Buchiana. A, B. Central region of the stem showing the pith, the primary xylem (black in fig. A) and (A) the inner part of the secondary xylem; a, shoulders of xylem at the leaf-gaps; It leaf-trace; px protoxylem. C. Secondary, x', and primary xylem, x^. D. Radial longitudinal section of the secondary xylem. E. Soalariform tracheid of the primary xylem. F. Pits on the meduUary-ray cells. (After Solms-Laubach.) of primary xylem composed of large polygonal tracheids (fig. 462, C, x^) characterised by a dehcate scalariform pitting on all their walls (fig. 462, E). The primary xylem forms a narrow layer on the sides of the elHpse, 1â3 elements broad (fig. 462, A, B), but 14â2. 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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Keywords: ., bookcentury1800, bookdecade1890, bookpublishercambr, bookyear1898
