Handbook of practical botany for the botanical laboratory and private student (1908)
Strasburger, Eduard, 1844-1912, Hillhouse, William, 1850-1910 · London, S. Sonnenschein; New York, Macmillan · leaf 201
d not fully developed. Adjoining the one or more centralvessels are almost always six narrower scalariform vessels (sc*);to each of the last succeed a group of quite narrow spiral andannular vessels, or vascular tracheides; which constitute theprotoxylem {sp, sp + a). The size of these elements,… … Fig. 65.—Cross-section of the base of a strong adventitious root of Allium Cepa.c, cortex ; e, endodermis ; 2^, pericycle; a, annular vessels ; sp, sp*, spiral vessels ;sc and sc*, scalarilbrm vessels ; v, bast (x 240). xylem bundle through 180 degrees. The xylem strings are inthis case united into…
Botany · Plant physiology · Microscopy
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