. A textbook of botany for colleges and universities ... Botany. 68o ECOLOGY the bundle termini of angiosperm leaves, tracheids usually remain as such, that is, the end walls are not resorbed (fig. 1003). Tracheids are much shorter than tracheae, rarely exceeding a millimeter in length, though sometimes attaining a length of twelve centimeters (as in Nelumbo) or even a meter (as in some conifers). Tracheae rarely are longer than ten centimeters, though they may attain a length of one or two meters in Quercus and three to six meters in lianas (as Wistaria) and in Eucalyptus. While isolated trac
. A textbook of botany for colleges and universities ... Botany. 68o ECOLOGY the bundle termini of angiosperm leaves, tracheids usually remain as such, that is, the end walls are not resorbed (fig. 1003). Tracheids are much shorter than tracheae, rarely exceeding a millimeter in length, though sometimes attaining a length of twelve centimeters (as in Nelumbo) or even a meter (as in some conifers). Tracheae rarely are longer than ten centimeters, though they may attain a length of one or two meters in Quercus and three to six meters in lianas (as Wistaria) and in Eucalyptus. While isolated tracheids and tracheae sometimes occur, they usually are grouped in continuous strands traversing the entire plant body. Individual tracheids or tracheae, even within a single conductive strand, vary widely in wall sculpturing, owing to differential lignification. When the thickenings. m Fig. 1002. — A diagrammatic longitudinal section of a young xylem strand; c, cambium; y, a young undifferentiated trachea with cross walls as yet un- resorbed; p, a trachea with transversely elongated pits; s, spiral tracheae; a, an annular trachea; m, pith; highly magnified. — From Barnes (Part II).. 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 Coulter, John Merle, 1851-1928; Barnes, Charles Reid, 1858-1910, joint author; Cowles, Henry Chandler, 1869- joint author. New York, Cincinnati [etc] American book company
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