Xanthophyll 



yearly 



etiolated plant (Van Tieghem) ; 

 Xan'thophyll (<f>t\\oi>, a leaf), a 

 constituent of chlorophyll, a yellow 

 colouring matter insoluble in water ; 

 Xanthophyl'lidrine, a yellow crys- 

 tallizable pigment, like the last, but 

 soluble in water ; Xanthopi'crine 

 (irtKpos, bitter), a yellow bitter 

 principle from the bark of Zan- 

 thoxylon caribbaeum, Lam. ; Xan- 

 thorham'nin, the yellow colouring 

 matter of the ripe fruits of Rham- 

 nus ; Xanthotra'metin ( + TBAMA), 

 a colour resin in Fungi, as Poly- 

 porus cinnabarinus, Fr. 



Xen'ia (ej/ios, belonging to a guest), 

 Focke's term for the direct influ- 

 ence of foreign pollen on the parts 

 of the mother-plant (Stift). 



Xenocar'py (t-tvos, a stranger, Kapiros, 

 fruit), producing fruit as the result 

 of xenogamy ; Xenochro'ma (xpw^a, 

 colour), Focke's term for the effect 

 of foreign pollen producing a change 

 in the colour of the fruit ; Xenog'- 

 amy (TCI^CS, marriage), cross-fer- 

 tilization between sexual elements 

 borne by different individuals 

 (Loew) ; cf. GEITONOGAMY ; Xeno- 

 plas'ma (7rXao>ia, moulded), em- 

 ployed by Focke to denote change 

 in shape of fruit produced by the 

 action of foreign pollen. 



xerampel'inus (Lat. ), the dull red or 

 purple of dead vine leaves. 



xeroclias'tic (^pos, dry, x ao >"* w > I 

 gape), applied by Ascherson to 

 plants whose fruits burst by 

 desiccation and their seeds or 

 spores are scattered ; Xe'rophile 

 (iuXew, I love), a plant which 

 grows in a dry situation ; xero- 

 ph'ilous, growing in arid places ; 

 Xe'rophyte ((pvrov, a plant), a plant 

 which can subsist with a small 

 amount of moisture, as a desert 

 plant ; adj. xerophyt'ie ; Xerot'- 

 ropism (rpoiTT], a turning), the 

 tendency of plants or parts thereof 

 to alter their position to protect 

 them selves from desiccation ( Borzi) ; 

 adj. xerotrop'ic. 



xiph'ioid (#0oj, a sword, elSos, re- 



semblance), sword-like, ensiform ; 

 xiphophyl'lous, -lus ((f>v\\ov, a leaf), 

 with ensiform leaves, as Iris. 

 Xylan (|u\ov, wood), the chief con- 

 stituent of WOOD-GUM ; Xy'lem, 

 the wood-elements of a vascular 

 bundle, possessing tracheal tis- 

 sue ; ^ Bridges, connections 

 surrounding phloem - islands ; ^ 

 I'slands, detached strands of xylem 

 in certain species of Thunbergia 

 (Roulet) ; ~ Pareneh'yma, oblong 

 cells which retain their proto- 

 plasm, with thick and lignified 

 walls, occurring in longitudinal 

 bands ; ~ Plate, ~ Ray, a radial 

 plate of xylem between two medul- 

 lary rays ; cf. PHLOEM RAY ; xyl'i- 

 nus, woody, pertaining to wood ; 

 xylocar'pous, -pus (/ca/37roj, fruit), 

 the fruit becoming hard and 

 woody ; Xyl'ocnrome (x/jw/ta, 

 colour), (1) wood - dyes, chiefly 

 tannins ; (2) the dark coloured 

 contents of the vessels of the 

 duramen (Hartig) ; Xylo'dia, Xylo'- 

 dium (eTSos, like), (1) the woody 

 fruit of Anacardium ; cf. XYLO- 

 PODIUM ; (2) an old name for 

 ACHENE ; Xyl'ogen (yews, off- 

 spring), used by Sachs for wood- 

 substance ; Xylo'ma, a sclerotioid 

 body which does not produce 

 branched sporophores, but sporo- 

 genous structures within itself ; 

 Xylomy'ces (^77?, a mushroom), 

 a Fungus which grows on wood 

 or bark ; Xylonite, cellulose manu- 

 factured in plastic masses ; xylo- 

 ph'ilous (0/Xew, I love), applied to 

 Fungi which attack woody tissue ; 

 Xylopod'ium (TTOVS, irodos, a foot), a 

 fruit like a nucule, but wanting a 

 cupule, and borne upon a fleshy 

 support, as in Anacardium ; Xy'- 

 lose, a pentose occurring in wood ; 

 Xylostro'ma, the leathery felted 

 mycelium of certain Fungi which 

 destroy timber ; Xylot'omy (TO/ACS, 

 a cut), the anatomy of wood, and 

 woody tissues; adj. xylotom'ic. 



yearly, annual, of a year's growth. 



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