740 PHARMACEUTICAL BOTANY 
Vas'cuLum.—A collecting case used by botanists. 
VeGc’ETABLE.—A plant. 
Vern.—A strand of fibrovascular tissue in a leaf. 
VELA’MEN.—An absorptive tissue composed of several layers of dead cells cover~- 
ing the roots of some tropical epiphytic orchids and aroids. 
VENA’TION.—The arrangement of veins in a leaf. 
VEN’TER.—The enlarged basal portion of an archegonium. 
VEN’TRAL CANAL’ CeLL.—A cell beneath the entrance of the neck portion of an 
archegonium. 
VeERMIC’ULAR.—Worm-shaped. 
VERNA’TION.—The manner in which leaves are disposed in the bud. 
VeER’RUCOSE.—Wart-like. 
VERTICILLAS'TER.—A pair of dense cymes in the axils of opposite leaves. 
VERTIC'ILLATE.—Whorled. 
Ves’sEL.—See trachea. 
Viiiosr’,—Covered with soft, thin, rather straight hairs. 
Viriwes’cent.—Greenish. 
Vis’ciw.—Sticky. 
Vrrra.—An oil tube in the fruit of an Umbelliferous plant. 
Votatite Or..—An odorous, liquid hydrocarbon not leaving a greasy stain on 
filter paper. 
Vor'vA.—The covering extending from the margin of the cap to the base of the stipe 
in some toadstools, which is ruptured during growth and adheres around the 
bulbous base. 
WATER Pores.—See Hydathodes. 
_Waxes.—Esters of the fatty acids, other than glyceryl esters, usually found in plants 
as a layer over the cuticle of various stems, leaves and fruits. 
Woop.—All that portion of a woody exogenous plant axis lying inside of the 
cambium line; also applied to the xylem region of conducting bundles. 
Woop CircLe.—In exogenous stems and roots of secondary structure, all the region 
within the cambium line except the pith and internal RL if present, and 
consisting of the xylem and the xylem portion of medullary ra 
Woop Fisers.—Fibers found in the xylem. 
Woop Ray (Xylem Ray).—All that portion of a medullary ray between two wood 
wedges. 
Woop Wepces (Xylem Wedges).—That portion of the oes region between two 
wood medullary rays. 
Xyv’Ltem.—That portion of a vascular bundle which contains trachez or tracheids 
or both and often wood parenchyma and fibers. 
Zoéc.oer’A.—A gelatinous mass of bacteria. 
Zo’6sProrE.—A ciliated spore having the power of movement. 
ZyGomor’pHic.—Applied to irregular flowers like those of the Broom and Pea 
which can only be divided into similar halves in one direction. cf. 
Actinomorphic. 
Zyc’osporE.—A spore resulting from the union of two like gametes. 
Zy'cote.—A cell resulting from the union of two sexual cells or their nuclei. 
Zy’mocEN.—A microorganism capable of producing fermentation. 
