. Botany for high schools and colleges. Botany. i TEE PRINCIPAL TISSUES. 83 posite in those formed later; while in interrnpted spirals both directions occur in the same yessel. Rinyed and reticu- lated yessels are opposite modifications of the spiral form; A JB. Pig. 73.—Scalariform vessels of the rhizoma of Pteris aquilina. A, longitudinal sec- tion of an end (about one third of the whole) of a short vessel; /, the fusiform ex- tremity, with long pits placed transversely; B, a small portion 6i A, taken from tc, and much more highly magnified ; C, a longitudinal section of a portion of the sid
. Botany for high schools and colleges. Botany. i TEE PRINCIPAL TISSUES. 83 posite in those formed later; while in interrnpted spirals both directions occur in the same yessel. Rinyed and reticu- lated yessels are opposite modifications of the spiral form; A JB. Pig. 73.—Scalariform vessels of the rhizoma of Pteris aquilina. A, longitudinal sec- tion of an end (about one third of the whole) of a short vessel; /, the fusiform ex- tremity, with long pits placed transversely; B, a small portion 6i A, taken from tc, and much more highly magnified ; C, a longitudinal section of a portion of the side wall between two vessels ; D, a similar section through the inclined end wall {A,f); in the upper part of D, at/the wall between the thickening ridges is broken through. A, X 142 ; the others x 375.—After De Bary. the first are due to an under-development of the thickening forces in the young vessels, resulting in the production here and there of isolated rings (Fig. 72, v) •, reticulated vessels are due, on the contrary, to an ov^r-development, which. 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 Bessey, Charles Edwin, 1845- [from old catalog]. New York, H. Holt and company
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