detersile 



disterigmatic 



branches which readily falls or is 

 cleaned off (I. B. Balfour), 

 deutoplas'mic {TrXdaixa, that formed), 

 metaplasmic granules of reserve 

 food material stored in protoplasmic 

 substance (Minchin). 

 dexiotrop'ic (Sexto's-, right-hand; 

 TpoTTT), turning), (1) the movement 

 of Yolvox in normal rotation; (2) 

 the direction of spiral cleavages ; 

 dez'tral, used of respective daughter- 

 cells resulting from spiral cleavage 

 (Treadwell). 



diagelc, add, (2) used for plants 

 whose shoots protrude through 

 the soil ; c/. epigeic (M. Vahl). 



Diagno'sis ( SiayvajCTi?, discrimina- 

 tion), shortly-drawn characters to 

 define a species, genus or family 

 (Bischofif, supplementing A. Gray's 

 definition). 



di'allel {hidXX-qXog, crossing), of lines 

 which cross (Schmidt). 



diarthrodact'ylous (-|- arthrodactyl- 

 ous), in Characeae each dactyl con- 

 sisting of two cells ; Diate'siae, 

 pi. {irrjOLos, annual), above- 

 ground shoots lasting the entire 

 year (Krause) ; Dicar'yon {Kapvov, 

 a nut), a binucleate cell of secondary 

 hyphae in Coprinus fimetarius (Ben- 

 sande) ; DicU'nery (Church) = Di- 

 CLiNisM ; Dicotyle'dony, the con- 

 dition of being dicotyledonous 

 (Jeffrey). 



dickso'nioid (eiSo?, resemblance) like 

 the fern Dicksonia L'H6rit. 



Dictyoste'ly, having a Dictyostele. 



Diecodichog'amy (+ Dichogamy), 

 some flowers having male flowers 

 in advance of the female, and in 

 others the reverse (Delpino) ; Di- 

 Hy'brid (+ Hybrid), c/. Dihy- 

 B RID ISM ; ~ Ra'tio, the Mendehan 

 proportions of 9:3:3:1; di- 

 m'erous [p.ipo's, part), seedlings 

 which have two cotyledons and 

 two primordial leaves ; Dim'ery, the 

 condition just described (Church). 



dineur'oid, used of pinna-traces in 

 Zygopteridae, fossil ferns, when in 

 four rows as in Dineuron Scott 

 (Scott) ; dioe'eious, ~ macran'drous 



in Oedogonium, where the antheridia 

 are little less in size than the female 

 filaments, and ~ nannan'drous, 

 male plants very small (West) ; 

 dipho'tic {(f>a}9, light), leaves set on 

 stem at an angle to get more light 

 on the upper surface than on the 

 lower (Clements). 



Dinoflagella'ta (3iVo?, rotation, + 

 Flagellata), infusoria possessing 

 more than two flagella for their 

 propulsion. 



Dip'lasy (StTrAaato?, double), the 

 division of an axial organ into two 

 parts. 



Diplobi'ont (SittAoo?, twofold; jSi'oj, 

 life), a plant flowering or fruiting 

 twice in each season; adj. diplobi- 

 on'tic; diploid, add, (2) the result 

 of two gametes (Lotsy) ; diplo- 

 steph'anous, {aT€<f>avos, a crown), 

 a double circle of stipulodes at 

 the base of each whorl of branchlets 

 in Characeae. 



dip'terid, resembling the genus Dip- 

 teris Reinw. 



Dirup'tion {dirumpo, I break), division. 



disbud'ded, the nascent buds removed ; 

 ~mu'tant, cf. Mutant. 



Disc'olith {Mdos, stone), a coccolith 

 shaped like a disc (Lohmann). 



dis'color, add, (2) " also any green 

 colour altered by a mixture of 

 purple " (Lindley). 



discontig'uGUS {dis = not; contigaiLs, 

 touching), used by I. B. Balfour for 

 rhododendron leaves having gaps 

 between them. 



Discs or Disks, pi. {discus, a quoit) ; 

 ~-flraments, tubular prolongation 

 of thallus-cells in Ulva Linn. 

 (West); cf. Separation-discs. 



Disjunc'tion {dis = not; jimcfio, 

 joining), (1) separation of a bivalent 

 spireme into two univalent spi- 

 remes ; (2) separation of a bivalent 

 or heterotype chromosome into 

 two entire chromosomes (Digby). 



di'some or dis'some, diploid. 



Dissociation, add, (2) fission (Digby). 



disterigmat'ic, having two spores 

 ab jointed from each of the basidia 

 of certain fungi (Buller). 



433 



