The induction, development, and heritability of fasciations . lant studied is growing-near the southeast comer of the cemetery at Tucson. It is about and extends horizontally, so that the diameter of the shrub may perha]xsbe 3 m. The shrub has in consequence a squat appearance. In structure Kccberlinia shows several striking- characters. A cross-section of a branch mm. in diameter and 5 cm. from the tip has in thecortex four well-marked regions. It is bounded by an epidermis with avery heavy cuticle, from 80 to 96 m thick, which is pierced by stomal canals,immediately beneath th
The induction, development, and heritability of fasciations . lant studied is growing-near the southeast comer of the cemetery at Tucson. It is about and extends horizontally, so that the diameter of the shrub may perha]xsbe 3 m. The shrub has in consequence a squat appearance. In structure Kccberlinia shows several striking- characters. A cross-section of a branch mm. in diameter and 5 cm. from the tip has in thecortex four well-marked regions. It is bounded by an epidermis with avery heavy cuticle, from 80 to 96 m thick, which is pierced by stomal canals,immediately beneath the epidermis and reaching to it is a band of chlorophyllnearly mm. in breadth. This band is btninded on its inner surface by KCEBERLINIA SPINOSA. 19 a ring- of mechanical tissue composed of hard bast connected by grit-cells,and within this ring- is the thin-walled parenchyma, which separates thehard-bast ring- from the cambium. Medullary rays reach to the ring- ofmechanical tissue. The wood and the pith exhibit no features of interest inthis study. Fig. 8.—Kivberlinia spinosa: Segment from cross-sectionof stem mm. in diameter, to show distribution ofchlorophyll. The chlorophyll is practically wholly limited to the cortex. If it is foundin the wood at all it is in the outermost medullary rays. The most impor-tant chlorophyll-bearing- tissue is the subepidermal band which occupiesthe area between the epidermis and the hard-bast ring-. The outer cellsare palisade in form; the inmost three layers are spong-y chlorenchyma orthey may be elongated in a tang-ential direction. The parenchyma, whichoccurs opposite the g-rit-cells, and therefore between the hard-bast groups,although forming- a part of the chlorophyll band, are morphologfically theouter ends of the cortical mediillary rays. The cells referred to are exteriorto the grit-cells and have become detached from the medullary rays by theassumption of heavy walls by that part of them which lies between thehard-bast
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