. Carnegie Institution of Washington publication. THE WATERLILIES. beginning in the meristem immediately back of the initial layer of cells Fig. 6 a}. They appear to be without communication of any kind with one another, i. e., the cells bounding them fit together without transverse inter- cellular spaces. A single perforation mm. in diameter has been observed in the side wall of a canal in a root of N. tuberosa, but this must for the present be considered exceptional. At more or less frequent intervals ( mm. to mm. for N. tubcrosa, mm. to 5 mm. for N. elegans X zcuizibaric
. Carnegie Institution of Washington publication. THE WATERLILIES. beginning in the meristem immediately back of the initial layer of cells Fig. 6 a}. They appear to be without communication of any kind with one another, i. e., the cells bounding them fit together without transverse inter- cellular spaces. A single perforation mm. in diameter has been observed in the side wall of a canal in a root of N. tuberosa, but this must for the present be considered exceptional. At more or less frequent intervals ( mm. to mm. for N. tubcrosa, mm. to 5 mm. for N. elegans X zcuizibaricnsis) diaphragms lie directly or obliquely across the canals. A diaphragm is a very thin plate of epithelioid cells ( mm. to mm. thick for N. tuberosa] with sinuous margins ; the pro- tuberances of the margins of the cells meet one another, leaving spaces be- tween the sinuses (Fig. 12 /). In N. loins the cells are more even in out- line, with large, round, in- tercellular spaces. Thus the passage of gases is left practically unimpeded. The walls of the canals are a single cell-layer thick, and FIG. 8.—Hoot of Zv. ooorata, transverse section. From photomicro- graph ;<, ol ;k'rrais; h, false epidermis, bear Stellate Cells (idio- blasts) here and there. In N. tuberosa these occur about cm. apart on the average along each canal ; in N. elegans X zanzibaricnsis they are. 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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