The induction, development, and heritability of fasciations . A^ „ W^lh- ;^-:<:. A.—CONDALIA SPATHULACA. Branch from a plant, which is an evergreen, grow-ing on the rocks below and to the north of the laboratory building. April 25, 1 907 . B.—CELTIS PALLIDA. Portion of a branch from a plant which is growing near theCondalia of A, showing the character of the leaf-covering. This also is an ever-green. CELTIS PALLIDA. With an increase in diameter of the stem characteristic changes take place,more particularly in the cortex, which greatly affect the topography of thechlorophyll apparatus. As t
The induction, development, and heritability of fasciations . A^ „ W^lh- ;^-:<:. A.—CONDALIA SPATHULACA. Branch from a plant, which is an evergreen, grow-ing on the rocks below and to the north of the laboratory building. April 25, 1 907 . B.—CELTIS PALLIDA. Portion of a branch from a plant which is growing near theCondalia of A, showing the character of the leaf-covering. This also is an ever-green. CELTIS PALLIDA. With an increase in diameter of the stem characteristic changes take place,more particularly in the cortex, which greatly affect the topography of thechlorophyll apparatus. As the cortex becomes wider, rings of secondaryhard bast are formed within the i^rimary ring-; parenchyma, which for themost part contains chlorophyll, extends between these ring-s. The groupsof bast are connected in part or always by medullary rays. As the stemincreases in diameter these groups are pushed farther and farther apartand the intervening- portion becomes filled with parenchyma which containschlorophyll. In this respect Celtis striking-ly resembles Prosopis. The sec-
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