. The topography of the chlorophyll apparatus in desert plants. Chlorophyll; Desert plants; Plants. 10 TOPOGRAPHY OF CHLOROPHYLL APPARATUS IN DESERT PLANTS. stant 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. Diameter of stem. Width of cortex. Depth of phelioderm. Width of phelioderm. Depth of chlorophyll band. Width of chlorophyll band. cm. 6 21 34 49 64 79 144 178 mm. 2 3-5 4 V 8 10 16 1^ 320 300 4'5 „ 581 1079 54-4 80 80 7
. The topography of the chlorophyll apparatus in desert plants. Chlorophyll; Desert plants; Plants. 10 TOPOGRAPHY OF CHLOROPHYLL APPARATUS IN DESERT PLANTS. stant 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. Diameter of stem. Width of cortex. Depth of phelioderm. Width of phelioderm. Depth of chlorophyll band. Width of chlorophyll band. cm. 6 21 34 49 64 79 144 178 mm. 2 3-5 4 V 8 10 16 1^ 320 300 4'5 „ 581 1079 54-4 80 80 80 39-2 32 M 78 96 102 96 147.;: 32 35-2 32 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. high 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, mm. 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, again, is a collenchyma-like tissue about as thick. The chlorophyll band, about three cells wide, lies immediately within the last-mentiofted tissue and occupies the 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 chlorenchyma. The wood and the pith present no character- istics of interest in the present connection. In addition to the chlorophyll band, chlorophyll occurs also in most of the inner cortical parenchyma, in the medullary rays of the w
Size: 1904px × 1313px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectplants, bookyear1908
