. Carnegie Institution of Washington publication. •••InW" ' ' v. '.''• ': "'.V* *'.-••.:'. •'\. chlorencliyma of the leaf was observed also in I\raiucria cancscens, where the cortical chlorophyll band is likewise palisade. CELTIS PALLIDA. (Plate 2, B, and figs. 2 and 3.) The specimen of Ccltis which was chosen for study is growing in the arroyo below and to the east of the Laboratory building". A branch about 2 in. in length was selected and sections made at the following distances from the tip: 6, 21, 34, 49, 64, 79, 144, and 178 cm. The parts of the- branch where the sec- tion
. Carnegie Institution of Washington publication. •••InW" ' ' v. '.''• ': "'.V* *'.-••.:'. •'\. chlorencliyma of the leaf was observed also in I\raiucria cancscens, where the cortical chlorophyll band is likewise palisade. CELTIS PALLIDA. (Plate 2, B, and figs. 2 and 3.) The specimen of Ccltis which was chosen for study is growing in the arroyo below and to the east of the Laboratory building". A branch about 2 in. in length was selected and sections made at the following distances from the tip: 6, 21, 34, 49, 64, 79, 144, and 178 cm. The parts of the- branch where the sec- tions were made had the following diame- ters: 2, ,4, , 6, 8, mm. and 1 and cm., respectively. A section of a branch 2 mm. in diameter and 6 cm. from the tip shows the following general structural re- lations : Cortex: There are several well - defined cortical divisions. An epidermis with a thin outer wall and a sub- epidermal tissue about three cells in thick- ness bound the stem. Within this lies a c h 1 o r o p h y 11 band FIG. 2.— Celtispallida: A, section of branch 2 mm. in diam- \yhich is also about eter; B, section of branch mm. in diameter. three cells in thick- ness. A discontinuous ring of hard bast is situated within the chlorophyll band. Between the hard bast and the cambium is the region of the inner cortical parenchyma. Woody cylinder: The wood is composed very largely of wood fibers with a noticeably small amount of wood parenchyma. The pith is well marked but does not need further mention in this connection. Chlorophyll occurs in the outer cortical parenchyma, in much of the par- enchyma which lies between the hard bast and the wood, in the medullary rays, both of wood and of cortex, and in the outer cells of the \ • \ .._=:.. J i '• 'fo-. /, £_, _-—""* * " -—*..»:• * •"•"" " B * The term chlorophyll band as used in this paper refers to that portion of the cortica
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