. Contributions from the Hull Botanical Laboratory. Plants. 124 BOTANICAL GAZETTE [august dense cell contents. Late in the history of the plant the pericycle becomes lignified. There is no differentiated endodermis in either old or young stems. In the cortex of the young stem is a continuous band of tissue 7-8 cells wide, which responds to the test for suberin (Tun- mann 16). This is in patches in the older stems. The intercel- lular spaces of the pith are very Figs. 13-15.—Fig. 13, young stem of P. methysticum after differentiation has been completed, X80; fig. 14, petiole, X101; fig.
. Contributions from the Hull Botanical Laboratory. Plants. 124 BOTANICAL GAZETTE [august dense cell contents. Late in the history of the plant the pericycle becomes lignified. There is no differentiated endodermis in either old or young stems. In the cortex of the young stem is a continuous band of tissue 7-8 cells wide, which responds to the test for suberin (Tun- mann 16). This is in patches in the older stems. The intercel- lular spaces of the pith are very Figs. 13-15.—Fig. 13, young stem of P. methysticum after differentiation has been completed, X80; fig. 14, petiole, X101; fig. 15, sector of stem after interfascicular cambium has been developed, X101. Secondary activity in the stem There are two methods by which the stem of Piper methysticum enlarges: (1) by active division of pith cells; (2) by cambail activity. 1. In the center of and at irregular intervals throughout the pith, groups of cells will divide actively throughout the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hull Botanical Laboratory. [Chicago : University of Chicago Press
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectplants, bookyear1895
