Ezosmose 



external 



Exosmo'sis {uxr/jLhs, a thrusting), the 

 passage through a membrane out- 

 wards from a thin to a dense fluid ; 

 ^n'oBT^ore, Exospor'iuyn {(rnopa, seed), 



(1) the outer covering of the spore ; 



(2) a thick coat developed from the 

 periplasm round the oospore in 

 Peronosporeae ; (3) the three outer 

 layers of the spores of Isoetes (Fitt- 

 ing) ; Exosporin'ium, the outer in- 

 tegument of a pollen-grain, or micro- 

 spore of flower. ng plants (Fitting) ; 

 exos'porous, having scattered spores, 

 as Fungi ; Ex'ostome, Exod'oma 

 {(Tr6iJ.a, a mouth), the foramen of the 

 outer coat of the ovule ; Exosto'sis 

 (oo-reW, bone), (1) the nodules on 

 roots of Leguminosae ; (2) the hard 

 turgescence of sound wood, showing 

 as }>rominent knots ; Exosty'lus J 

 (+ Stylts), Mirbel's word for fruit 

 as in Labiatae, four seemingly naked 

 nutlets ; ezoter'ic {i^urepiKhs, ex- 

 ternal), arising from outside the 

 organism, the opposite of esoteric ; 

 Exotest'a (-f Testa), the hard outer 

 layer of a seed-coat (F. W. Oliver) ; 

 Exothe'cium (flrj/fi?, a case), (1) the 

 outer case of the anther (Henslow, 

 Lindley) ; (2) Purkinje's term for 

 tlie extine or outer layer of pollen- 

 grains ; exotherm'ic {depfihs, hot), 

 heat derived from outside, and not 

 as the result of vital action. 



exot'ic {e^wriKhs, foreign), not native, 

 introduced from aliroad ; Exot'ics 

 are those plants which are not in- 

 digenous ; Exot'ism, a shortened 

 form of Exot'icism, the condition 

 of non-nativity, introduced from 

 abroad. 



exotroph'ic (e|w, out of ; rpo<pt), 

 nourishment), employed by Wiesner 

 where an organ or lateral shoot, 

 as opposed to the mother-shoot, 

 is most sti'ongly developed ; Ex- 

 ot'rophy, development of lateral 

 shoots instead of the main axis ; 

 exotrop'ic (t/jottt;, a turning), ferti- 

 lized from antliers of the same }»lant 

 (K. Pearson) ; Exot'ropism, the 

 tendency of lateral roots to grow 

 away from a main root (Willis) ; Ex- 



ot'ropy, roots arising from the small 

 extremities of a flattened secondary 

 root (Lopriore). 



expand'ed, exvan'sus (L,at. spread 

 out), diffuse ; Expan'sion, the con- 

 dition of a flower in full perfection ; 

 ^ of protoplasm., the normal con- 

 dition when it is impermeable 

 to cell-sap, the opposite of con- 

 traction, when it is flaccid and 

 permeable. 



ex'planate, exnlana'tus (Lat., flattened 

 out), spread out flat. 



Explodiflo'rae {expludo, I drive off; 

 Jios, jloris, a flower), Delpino's term 

 for wind-fertilized iioweis which ex- 

 pel their pollen by explosive action. 



expursive {expulsus, driven out) 

 Fruits, fruits which forcibly expel 

 their seeds. 



exquisi'tus + (Lat., choice), used of 

 parts larger or more highly coloured 

 than usual, as Bracteae exquisitae ; 

 cf. Coma. 



exraphid'ian {ex = without ; + 

 Rapiiis), destitute of raphides 

 (Gulliver). 



exscul'ptus (Lat., carved out), show- 

 ing small depressions as though dug 

 -out, as the seeds of Anchiisa. 



exsert', exsert'ed, exscrt'us (Lat., pro- 

 truded), protruded beyond, as 

 stamens beyond the tube of the 

 corolla. 



Exsicca'ta {cxsiccatus, dry), dried 

 plants, usually in sets for sale or for 

 subscribers, frequently with printed 

 tickets (Note. — Fhyra exsiccata is 

 the full expression). 



exstip'ulate, exftijjula'tiis {ex, priv. f 

 -f- Stipula), wanting stipules. 



exsuc'couB, exsuc'cus (l.at.), juiceless. 



Extensib'ility {extensus, spread out), 

 having the property of stretching. 



exten'sus (Lat), spread out. 



extenua'tus (Lat., thinned), a synonym 

 of viRiiA'ius (Henslow). 



exte'rior (Lat., outer), outer, in the 

 flower sometimes = antekior. 



extern'al, extern' us (Lat.), outward; 

 ~ Sheath, a modilication of the 

 Imndle-shcath, stated to occur in 

 Ferns (Kussow). 



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