. Fossil plants : for students of botany and geology . Paleobotany. xxi] OSMUNDACEAE 327 occur just within the edge, (ii) an inner zone of broader and shorter tracheae (fig. 248, x i). The protoxylem elements {px, fig. 248) are characterised by a single series of scalariform pits, while the metaxylem elements have multiseriate pits like ^x. Fig. 248. Zalesskya gracilis (Eich.). Transverse section of part of the stele: ph, phloem; xi, xii, xylem ; px, protoxylem. (After Kidston and Gwynne-Vaughan. x20.) those on the water-conducting elements of recent Osmundaceae. The tracheae show an interesti


. Fossil plants : for students of botany and geology . Paleobotany. xxi] OSMUNDACEAE 327 occur just within the edge, (ii) an inner zone of broader and shorter tracheae (fig. 248, x i). The protoxylem elements {px, fig. 248) are characterised by a single series of scalariform pits, while the metaxylem elements have multiseriate pits like ^x. Fig. 248. Zalesskya gracilis (Eich.). Transverse section of part of the stele: ph, phloem; xi, xii, xylem ; px, protoxylem. (After Kidston and Gwynne-Vaughan. x20.) those on the water-conducting elements of recent Osmundaceae. The tracheae show an interesting histological character in the absence of the middle substance of their walls, a feature recog- nised by Gwynne-Vaughan' in many recent ferns. External to ' Gwynne-Vaughan (08).. 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