. Carnegie Institution of Washington publication. 10 TOPOGRAPHY OF CHLOROPHYLL APPARATUS IN DESERT PLANTS. slant relation was not learned. In a branch cm. in diameter, as well as one 1 cm. in diameter, the chlorophyll was confined to the cortex. The following: measurements were made: Distance of section from tip. 1 liutiietei1 of stem. Width of cortex. Depth of phelloderm. Width of phelloderm. Depth of chlorophyll band. Width of chlorophyll band. cm. miii. M M M M /* 6 78 -t r 96 2=;. 6 34 J- D 4 300 54-4 39-2 49 4-5 415 80 22 .4 102 .4 64 6 547-8 80 32 102 3- 79 8 547
. Carnegie Institution of Washington publication. 10 TOPOGRAPHY OF CHLOROPHYLL APPARATUS IN DESERT PLANTS. slant relation was not learned. In a branch cm. in diameter, as well as one 1 cm. in diameter, the chlorophyll was confined to the cortex. The following: measurements were made: Distance of section from tip. 1 liutiietei1 of stem. Width of cortex. Depth of phelloderm. Width of phelloderm. Depth of chlorophyll band. Width of chlorophyll band. cm. miii. M M M M /* 6 78 -t r 96 2=;. 6 34 J- D 4 300 54-4 39-2 49 4-5 415 80 22 .4 102 .4 64 6 547-8 80 32 102 3- 79 8 547 -s 96 35-2 144 IO 581 80 28 178 16 1079 r- CONDALIA SPATHULACA. (Plate 2, A, and fig. 4.) The plant from which the branch studied was taken is growing- by the Hospital Road near the northeast corner of the Laboratory domain. The shrub is about m. hig-h and is a very vigorous one. Sections were made at the fol- lowing" distances from the tip: 2, 5, 20, 35, 65, 95 cm. These were , 2, 4, and , cm. in diameter, respec- tively. A cross-section of a young- branch mm. in diameter and 2 cm. from the tip shows the following' leading" structural characters: An epidermis with a thin cuticle bounds the stem. Within this is a hypodermal por- tion three cells thick, and within this, ag'ain, is acollenchyma-like tissue about as thick. The chlorophyll band, about three cells wide, lies immediately within the last-mentioned tissue and occupies tlu- central portion of the cortex. A relatively narrow inner cortical portion separates the chlorophyll band from the cambium. This inner part consists of a discontinuous hard-bast ring- and thin-walled parenchyma. The former abuts on the chloivnchyma. The wood and the pith present no character- istics of interest in the present connection. In addition to the chlorophyll baud, chlorophyll occurs also in most of the inner cortical parenchyma, in the medullary rays of the wood, and in
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