. Contributions from the Hull Botanical Laboratory. Plants. iQiSl PETRY—i >l'Il IOC LOSS. ICE. 11- 353 destruction of the greater portion of the original xylem of the stem; the attendant periderm formation has produced a considerable distortion of the stele. As the leaf trace separates from the stele (fig. 6, C) it is surrounded by a ring of xylem composed on the outer side of accessory secondary wood and on the inner side of centripetal secondary wood. This ring splits into two masses (fig. 6, D), and the leaf trace is cut off and carried out by periderm. 0.—Transverse sections of a
. Contributions from the Hull Botanical Laboratory. Plants. iQiSl PETRY—i >l'Il IOC LOSS. ICE. 11- 353 destruction of the greater portion of the original xylem of the stem; the attendant periderm formation has produced a considerable distortion of the stele. As the leaf trace separates from the stele (fig. 6, C) it is surrounded by a ring of xylem composed on the outer side of accessory secondary wood and on the inner side of centripetal secondary wood. This ring splits into two masses (fig. 6, D), and the leaf trace is cut off and carried out by periderm. 0.—Transverse sections of a branching rhizome of Bolrychium obliquum: I, injured region; X3-5- formation. At a somewhat higher level, the accessory secondary xylem closes across the gap (fig. 6, F). At a lower level (fig. 6, £), masses of xylem arise in the pericycle of one of the strands which formed part of the ring surrounding the leaf trace. Similar masses of pericyclic xylem occur outside the accessory secondary wood which closed the leaf gap dig. 6, F). The development at this point results in the formation of a closed ring of xvlem with cambium and phloem on the inside (fig. 6, (-'); at a slightly higher level, this becomes a tangled mass of tracheids. 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 Hull Botanical Laboratory. [Chicago : University of Chicago Press
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectplants, bookyear1895
