The induction, development, and heritability of fasciations . Fig. I.—Baccharis emoryi: A., segment from transverse section of youngstem to show the character of cortical chlorophyll band {ch. b.); i>, sec-tion of leaf, magnified as in A.^ Chlorophyll of the stem is confined to the cortex in both species and inboth the chlorenchyma is palisade. The palisade in the stems of each alsoclosely resembles that in the rudimentary leaves of the same species. Thissimilarity in the structure of the chlorophyll band* in the stem and of the *In all figures chlorophyll is indicated by stippling. TOPOGRA
The induction, development, and heritability of fasciations . Fig. I.—Baccharis emoryi: A., segment from transverse section of youngstem to show the character of cortical chlorophyll band {ch. b.); i>, sec-tion of leaf, magnified as in A.^ Chlorophyll of the stem is confined to the cortex in both species and inboth the chlorenchyma is palisade. The palisade in the stems of each alsoclosely resembles that in the rudimentary leaves of the same species. Thissimilarity in the structure of the chlorophyll band* in the stem and of the *In all figures chlorophyll is indicated by stippling. TOPOGRAPHY OF CHLOROPHYLL APPARATUS IN DESERT chlorenchyma of the leaf was observed also in Kramcria cancsccns, wherethe cortical chlorophyll band is likewise palisade. Celtis pallida. (Plate 2, u, and figs. 2 and 3.) The si:)ccimen of Celtis which was chosen for study is . in the arroyo below and to the east of the Laboratory A branch about 2 m. in lenofth was selected and sections made at the followinq- 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 hadthe following- diame-ters: 2, ,4, , 6,8, mm. and 1 cm., section of a branch2 mm. in diameter and6 cm. from the tipshows the following-ijeneral structiiral re-lations : Cortex: There areseveral well - definedcortical divisions. Anepidermis with a thinouter wall and a sub-epidermal tissue aboutthree cells in thick-ness bound the this lies ac h 1 o r o p h }• 11 bandwhich is also aboutthree cells in thick-ness. A discontinuous ring of hard bast is
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