. Carnegie Institution of Washington publication. 50 THE WATERLILIES. species has an additional interest as representing probably the most primitive member of the syncarpous series. In a transverse section of the caudex of N. flava (Fig. 21), one finds a pretty well marked cortex, a broad vascular ring with one to three leaf- gaps, and a well defined pith which is continuous with the cortex through the leaf-gaps. The vascular ring, however, presents a most peculiar. FJO. 21.—Transverse section of caudex of N. flava. h, base of leaf with bundles and air-canals; e, exocortejc; g, leaf gap; (, po
. Carnegie Institution of Washington publication. 50 THE WATERLILIES. species has an additional interest as representing probably the most primitive member of the syncarpous series. In a transverse section of the caudex of N. flava (Fig. 21), one finds a pretty well marked cortex, a broad vascular ring with one to three leaf- gaps, and a well defined pith which is continuous with the cortex through the leaf-gaps. The vascular ring, however, presents a most peculiar. FJO. 21.—Transverse section of caudex of N. flava. h, base of leaf with bundles and air-canals; e, exocortejc; g, leaf gap; (, point of branching of leaf trace; cortex ; n, endocortex ; p, pith (medulla); r, root trace ; t, central leaf trace. structure. Projecting slightly into the pith from the inside of the ring are seen seven or eight vascular bundles, /, of varying size, cut transversely, each with its phloem against the pith, and its xylem (of equal or greater amount) next to the vascular ring; these are the central leaf-traces. The greater part of the "ring" consists of horizontal or oblique elongated elements, mostly of phloem, but with some spiral tracheae ; these are derived from root-traces and lateral leaf-traces. In this ring and sometimes on the outer side of it, next the cortex, are additional bundles. 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
Size: 1606px × 1557px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1900, bookyear1905
