Hybrid 



Hydrome 



twin '^, hybrids identical but from 

 reciprocal sources ; unisez'ual '~ , 

 when a certain character found in 

 one parent does not occur in the 

 other (Clements) ; Hybrid'ity, Jly- 

 brid'itas, crossed in parentage ; 

 Hybridiza'tion, (1) the art of obtain- 

 ing hybrids by artificial crossing; 

 (2) also used for tlie same operation 

 occurring naturally ; Hyb'ridiform 

 (+ Form), a hybrid between Fini- 

 FoRMs (Kuntze) ; Hybridopro'liform 

 {prolef\, offspring), a fertile hybrid 

 of Hybridofokms (Kuntze) ; Hy- 

 bridog'amy {ydfjLos, marriage), hybrids 

 between different species ; Hybrid- 

 ol'Dgy {K6yos, discourse), the science 

 of hybridizing. 



Hy'dathode {v^wp, water ; bZhs, a way), 

 Haberlandt's term for water-pore 

 or Avatei-gland, an organ which 

 extrudes water or other liquid ; it 

 resembles a stoma with functionless 

 guard-cells; sub'stitute ~ ; cf. 

 Edemata ; Hydatophyti'a, pi. 

 [<pjThv, a plant), submerged forma- 

 tions (Diets) ; Hydracel'lulose ( + 

 Cellulose), see Cellulose ; Hy'drad 

 (4- ad), a hydrophyte (Clements); 

 Hydral'gae (+ Algae) = Hydro- 

 THYTEs; hy'drarcb (o^x^i begin- 

 niug), ap})lied to successions from 

 ponds or lakes by growth of plants ; 

 Hy'dras, the "wet form" of a 

 species (Clements). 



Hy'drastin, an alkaloid found in 

 Hydrastis canadensis, Linn. 



Hy'drate (u5a>/j, water), a compound 

 containing a definite proportion of 

 water in chemical combination ; 

 Hydra'tion, the act of becoming 

 chemically c >mbined with water ; 

 hy'dric, pertaining to water ; hydro- 

 car'pic {Kapirhs, fruit), used of 

 aquatic plants whicli are fertilized 

 above th^ water, but withdraw the 

 fertilized flowera below the surface 

 for development, as in Vallisneria ; 

 HydroCar'py, the condition de- 

 scribed ; Hydroceirulose, see Cel- 

 LiLosE ; Hydrocb'arid Formntion, 

 macrophytes such as Hydrocharis 

 floating on or in the water ; Macro- 



plankton ; Pleuston ; Hydro- 

 obi'moas {x^ijxwv), winter, used for 

 plants adapted to a rainy ^vinter 

 (Drude) ; Hy'drochore (x^P^^, asun- 

 der), a plant distribiited by water 

 (Clements); hydrocho'ric, dispersed 

 by water, rivers or floods ; Hydro- 

 cleistog'amy(+CLEiSTOu amy), when 

 flowers do not open in consequence 

 of submersion (Knuth); Hy'dro- 

 chrome (xp^m^j colour), used by 

 Nadson for the pigments of jRiissula 

 and Amanita Mitscaria, Fr. ; 

 bydrodynam''ic {hvvams, powef), 

 used for the action of tides and 

 waves in distribution ; Hy'droganu, 

 {ydfxos, marriage) = CRYProGAMS ; 

 Hydrobai'mose {apuS^M, I join to- 

 gether), response to water stimuli 

 (Clements) ; Hy'droid {eUos, like), 

 Potonie's term for a water-conducting 

 strand in aerial stems; a tracheid, 

 cf. Hydrome; hy'droger {gero, I 

 bear), water-bearing, as hydwg'era 

 Fa'sa, threads in a spiral vessel 

 which were formerly supposed to 

 convey fluid; hy'drolated, combined 

 with the elements of water, by 

 Hydrola'tion ; Hydroleu'cite ( -f 

 Leucite), Van Tieghem's term for 

 vacuoles in cell-sap, which he further 

 subdivides into tanniferous '-', oxal- 

 iferous -- , coloured ~ , albuminiferous 

 ■^ , in accordance with their produc- 

 tion of tannin, oxalates, coloui'ing 

 matter, or aleurone ; Hy'drolist, cf. 

 Cytohydrolist, Proteohvdrol- 

 LST ; hy'drolysed, {Kv<ns, a loosing), 

 chemically decomposed by taking up 

 the elements of water ; Hydrol'ysis, 

 the act of being hydrolysed ; Hy'dro- 

 lyst = Hydrolist ; Hy'drolyte, the 

 substance which undergoes fermen- 

 tation (Al'iiistrong) ; hydrolyt'ie, 

 causing hydrolysis ; Hy'drome, the 

 hydral or water-system of a vascular 

 bundle, cf. Hadromr ; water-con- 

 ducting tissue in stems, particu- 

 larized into, ~ -cyrinder, conducting 

 vasculir tissue supplying wate^; '- 

 -man'tle, composed of elements 

 identical with the hydroids of the 

 leaf- traces; — sheath, a separation - 



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