descending 



Dextrin 



organs of a lower grade, as stamens 

 for pistils, petals for stamens, etc. ; 

 '~' Sap, formerly applied to the 

 Cambium ; Descen'sus J = Root. 



Des'ert, Deser'tum (Lat.), a tract 

 where rain is continuously wanting, 

 and vegetation is most scanty, as 

 the Etjypto- Arabian desert; it may 

 be either climatic or edaphic. 



Deser'tion of Host = Ltpoxeny. 



de'sinens (Lat. ceasing), Desintn'tia, 

 ending in, the manner in which a 

 lobe terminates. 



desmid'ian, allied to the Desmideae; 

 Des'midocarp {Kap-nhs, fruit), the 

 special cystocarp of Balbianin ; the 

 fertilized trichogynial cell divides 

 transversely, each daughter-cell 

 in turn branching with terminal 

 oospores. 



Desmobry'a (Seo-yubs, a bond ; fipvov, a 

 moss), a division of Ferns, where 

 the fronds are adherent to the 

 caudex; cf. Eremobrya; Degmo- 

 chon'dria, pi. (x<^»'5pos, grain) = 

 ^Microsomes; Des'mogen (veWaw, I 

 brin§ forth), distinguished as pri'- 

 mary '-, the procambium, or em- 

 bryonic tissue from which the vas- 

 cular tissue is afterwards formed ; or 

 sec'ondary '-, formed fi'om the 

 cambium, afterwards transferred 

 into permanent vascular strands ; 

 Desmoplank'ton ( + Plankton), 

 plankton united into bands or 

 ribbons (Forel). 



destarch'ed, deprived of starch, as by 

 translocation. 



destructive Metab'olism, those changes 

 which take place during the waste 

 of tissues; '- Par'asite, one which 

 seriously injures or destroys the host. 



Desulphofica'tion {de, from, suljitr^ 

 brimstone, facio, I make), the re- 

 duction of sulphates and sulphites 

 by Desulphobacte'ria (Lipman). 



detect'us (Lat. laid bare) = naked. 



detenliive {detento, I hold back), used 

 of those parts of a Pitcher plant 

 Avhich detain insects (Macfarlane). 



Deter'minants, pi. {detervdno, I limit), 

 separate material particles in the 

 germ-cells; -^ of Hered'ity, those 



carried by zygotes (Weismann); 

 deter 'minate, determina'tus (Lat. 

 bounded), definite ; ~ Growth, 

 when the season's growth ends with 

 a bud; — Inflores'cence, when it 

 ends with a bud, as in cymes; De- 

 termina'tion, -atio, the ascel-taining 

 the names and systematic position 

 of plants, identification. 



deus'tate, deus'tons {denstus, burned 

 up), as if scorched (Heinig). 



Deu'ter (Ger., an interpreter) Cells, 

 a row of large parenchymatous 

 cells, empty or containing starch, 

 which occur in the middle nerve of 

 Mosses (Limpricht) ; cf. Pointer- 

 cells. 



Deuterog'amy {Sivrtpos, the second; 

 ydixos, marriage), peculiar nuclear 

 fusions in certain Cryptogams, 

 superposed upon and subsequent to 

 the sexual act (P. Groom). 



deutogen'otypic ( -f genotypic) = 



ISOGENOTYPIC. 



Deuterogonid'ium ( -f Gonidium), a 

 gonidium in the second generation 

 of a transitorial series (A. Braun 

 Denteroplas'ma {rrAdafia, moulded) 

 = Paraplasm ; sometimes con 

 tracted into Dent'oplasm; Deutero 

 stroph'ies {erpotp^, a twist or turn) 

 spiials of a third degree in the 

 development of leaves ; Oentozylem 

 ( + Xylem), a synonym of Meta- 

 xylkm). 



Devel'opment, the gradual extension 

 of the parts by which any organ or 

 plant passes from its beginning to 

 its maturity. 



Devia'tion, probable, Galton's term 



for probable variation. 

 Dew-leaves, leaves which slope up- 

 wards, so that dew is collected; 

 '^ -rust, "blotchy discoloration of 

 leaves caused by dew " (Heinig). 



dez'trad {deztra, the right hand) ; 

 an unusual modification of dez'tral, 

 towards or on the right side, as 

 a climbing plant, cf. dexthorse; 

 Dez'trin, a substance produced dur- 

 ing the transformation of starch into 

 sugar, said to be of two forms : — AcH- 

 roodextrin and Amylodextrin ; 



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