disjunctive 



(SUPPLEMENT) 



dyssophytes 



disjunctive (disjunctions, disjoined) 

 Symbio'sis, applied by Frank to 

 those cases in which the symbionts 

 do not form an associated organ- 

 ism, but are temporarily associated, 

 as in the case of insects and plants. 



Dissem'inule, a plant in the state of 

 being transported. 



Dis'trict, applied as the equivalent of 

 the Germ. Bezirk ; a small region 

 or tract of country. 



distromatlc ( + STROM A), applied to 

 those species of Porphyra with the 

 thallus in two layers ; cf. MONO- 



STROMATIC. 



Dis'trophy (Tpoffi, nourishment), em- 

 ployed by Re for disparity in size 

 of homologous organs. 



dodecan'der, dodecandrous. 



dolichosty'lous ( + STYLE), in dimor- 

 phic or trimorphic species applied 

 to the long-styled form. 



dominant (dominans, prevailing, 

 ruling), in hybrids, the prevalent 

 character, in opposition to RECES- 

 SIVE. 



Dominion, state, condition ; recently 

 used as the equivalent of Goebel's 

 "Staat," as Cell- ~, Energid- ~. 



Dom'itoform (domitus, tamed, forma, 

 form), a cultivated form, the 

 original being unknown or dis- 

 similar (Kuntze). 



dothidia'ceous, like the genus 

 Dothidia. 



double Fertilization, in Angiosperms, 

 when one male cell from the 

 pollen-tube fuses with the egg 

 nucleus, the other with the upper 

 polar nucleus, and this last with 

 the lower polar nucleus ; also 

 termed TRIPLE FUSION ; ^ Fmcti- 

 fica'tion, dimorphism in fruit, ap- 

 plied to certain Algae ; -~ Nee'dle, 

 in Sciadopitys, a dwarf branch 

 without bud-scales, the two leaves 

 being fused together at the edges 

 into one needle. 



Draining-point, of a leaf; cf. DRIP- 

 POINT. 



drepanoclad'ous (/cXdSos, a branch), 

 having sickle-shaped branches 

 (Russow). 



Drimlum (5/n/^s, pungent), an alkali 

 plain or salt basin formation ; 

 drimyphllus (0t\ew, I love), salt- 

 loving, halophilous ; Drimyphy'ta 

 (<f>vTov, a plant), salt-plants (Cle- 

 ments). 



Dromot'ropism (S/^os, a course, 

 rpoTr-Jj, a turning), the irritability 

 of climbing plants which results 

 in their spiral growth (Macmillan) ; 

 adj. dromotroplc. 



Drop-dis'ease, a disease of lettuce 

 ascribed to Botrytis vidgaris and 

 Sclerotinia Libertiana. 



Drupe, false, a nut-like fruit where 

 the lower persistent part of the 

 perianth becomes fleshy, as in 

 Neea. 



dru'sy, a mineralogical term used by 

 J. E. Smith to express the appear- 

 ance of the stigma of Orobanche 

 caryophyllea ; pruinose. 



Dune, undulating banks of blown 

 sand, with characteristic vegeta- 

 tion ; cf. THINIUM. 



du'plicate Par'asitism, self -parasitism, 

 as in the case of mistleto upon 

 mistleto. 



Dy'ad, a subdivision of a TETRAD by 

 mitosis, again dividing into single 

 elements (Calkins). 



Dyne, the unit of force expressed by 

 the weight of one gramme moving 

 one centimetre in one second of 

 time(Errera) [ = CGS]. 



dysanthlc (av6os, a flower), fertiliza- 

 tion by the pollen from a different 

 plant (K. Pearson). 



dyspho'tic, dysphotis'tic (0<y, 0um>y, 

 light), applied by A. F. W. 

 Schimper to the deeper situated 

 BENTHOS; ~ Plants, are those 

 which are adapted to a minimum 

 of light; dyst'ropous (T/JOTTTJ, a 

 turning), injurious insect-visiting, 

 so far as the flowers are concerned ; 

 Dys'tropy, the condition described. 



Dys'sophytes, -ae (di<r<ros, two-fold, 

 0vTov, a plant). Clements's term 

 for plants which are sometimes 

 hydrophytes and sometimes aero- 

 phytes ; the author gives the de- 

 rivation as from " Swr<ros, double." 



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