ZaropUlj 



Teait 



Xeropli^ily, the state ; xeroph'obous 

 {<p6Bos, fear), shunning drought; 

 Xerophorbi'um {<pop$ii, pasture) 

 »■ G ABIDE (Diels) ; Xe'rophyte 

 {(pvrhv, a plant), a plant 

 which can subsist with a small 

 amount of moisture, as a desert 

 plant; adj. xerophyt'ie; Xerophy- 

 ti'a, dry forest formations (Clem- 

 ents); Xeropo'ad (irci, grass, Hf- ad), 

 a heath plant ; Xeropoi'um, a heath 

 formation; Diels 's term for Steppr 

 formation ; zeropooph'ilas (^lAcw, I 

 love), heath-loving ; Xeropoophy'ta 

 {ipvrhy, a plant), heath plants 

 (Clements) ; Xe'ro-pteride'tum (ttc- 

 pis, a fern), an association of bracken 

 with heath plants ; Xe'rosere, cf. 

 Additions ; Xero8i''u2n, or Xerosi'on, 

 a plant succession on drained and 

 dried up soil (Clements) ; zerostat'ic 

 {trrariKhs, causing to stand), used 

 of successions completed under 

 xerophytic conditions (Clements) ; 

 Xerothamni'um {ednvos, a copse), 

 spiny shiub formation (Diels) ; 

 Xe'rotherm {Bspfios, heat), cap- 

 able of withstanding drought and 

 heat ; adj. zerotherm^io ; '^ Period, 

 Briquet's term for the post-glacial 

 period ; zeroth'erous {d«pos, sum- 

 mer), adapted to a dry summer, a 

 rainless period ; XerotVopiim {rpoirii^ 

 a turning), the tendency of plants 

 or parts thereof to alter theii- posi- 

 tion to protect themselves from 

 desiccation ( Borzi) ; adj. zero'tropio. 



ziph'ioid {il<pos, a sword; elSos, re- 

 semblance), sword-like, ensifomi ; 

 ziphophyrious, -lus {(pvKkov, a leaf), 

 with ensiform leaves, as Iris. 



Xylan ({uAov, wood), the chief con- 

 stituent of Wood-Gum) ; Xy'lem, 

 the wood elements of a vascular 

 bundle, possessing tracheal tissue ; 

 ~ Bridg'es, connections surrounding 

 phloem-islands; <^ I'slands, de- 

 tached strands of xylem in certain 

 species of Tkunhergia (Roulet) ; -^ 

 Faren<;h'yma, oblong cells which 

 retain their protoplasm, with thick 

 and lignified walls, occurring in 

 longitudinal bands ; ~ Plate, ~ 



Ray, a radial plate of xylem be- 

 tween two medullary rays; cf. 

 Phloem Ray ; zyrinui, woody, 

 pertaining to wood ; Xyli'um, a 

 wood fonnation ; zylooar'pous, -pus 

 {Kapnhs, fruit), the fruit becoming 

 hard and woody ; Xyrochrome 

 (xp«Mo, colour), (1) wood-dves, 

 chiefly tannins; (2) the dark 

 coloured contents of the vessels of 

 the duramen (Hartig); Xylo'dia, 

 Xylo'dium (elSos, like), (1 ) the woody 

 fruit of Anacardium; cf. Xylo- 

 podium ; (2) an old name for 

 Achene; Xyrogen (yeVoj, off- 

 spring), used by Sachs for wood- 

 substance ; Xylo'ma, a solerotioid 

 body which does not produce 

 branched sporophores, but sporo- 

 genous structures within itself ; 

 Xylomy'oei {/jiiKrjs, a muahroom), 

 a Fungus which grows on wood 

 or bark ; Xylonite, cellulose manu- 

 factured in plastic masses; zylo- 

 phlloas, -hc8 (0«\e«, I love), wood- 

 loving; applied to Fungi which 

 attack woody tissue; Xylopliy'ta 

 {iftvrhy, a plant), wood-plants (Clem- 

 ents); Xylopodlnm {wovs, woShs, a 

 foot), a fruit like a nucule, but 

 wanting a cupule, and borne upon 

 a fleshy support, as in Anacardium; 

 Xylose, a pentose occurring in 

 wood; Xylostro'ma, the leathery 

 felted mycelium of certain Fungi 

 which destroy timber; Xylot'omy 

 {ro/xhs, a out), the anatomy of 

 wood, and woody tissues; adj. 

 zylotomlo. 



yearly, annual, of a year's growth. 



Yeast (pr. . yeest), the minute uni- 

 cellular organisms which effect alco- 

 holic fermentation in sugary liquids ; 

 — Bud'ding, giving rise to similar 

 yeast-gonidia ; -- Fnn'ras, Saccha- 

 romyces Cerevisiae, J. Meyer ; some- 

 times termed Sprouting Fungus : — 

 Bot'tom -, Low '-', that which 

 forms at the bottom of the vats, 

 "Unterhefe" of the Germans; Up'per 

 ^ , or Barm, that which floats on the 

 surface, the German "Oberhefe" 



411 



