disjunctive 
(SUPPLEMENT) 
dyssophytes 
disjunc’tive (disjunctivus, 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. 
District, applied as the equivalent of 
the Germ. Bezirk ; a small region 
or tract of country. 
distromat'ic (+Stroma), applied to 
those species of Porphyra with the 
thallus in two layers; cf. MoNo- 
STROMATIC. 
Dis'trophy (rpo~, nourishment), em- 
ployed by Re for disparity in size 
of homologous organs. 
dodecan’der, dodecandrous, 
dolichosty’lous (+Styzz), in dimor- 
phic or trimorphic species applied 
to the long-styled form. 
dom'inant (dominans, prevailing, 
ruling), in hybrids, the prevalent 
character, in opposition to RECES- 
SIVE. 
Domin’ion, 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 
Dothidia. 
doub’le Fert’ilization,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; ~ Fructi- 
fica’tion, dimorphism in fruit, ap- 
plied to certain Algae; ~Nee‘dle, 
in Sciadopitys, » 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 (xkAddos, a branch), 
having sickle-shaped branches 
(Russow). 
genus 
Drim’‘ium (dpiuts, pungent), an alkali 
plain or salt basin formation; 
drimyph’ilus (¢ihéw, I love), salt- 
loving, halophilous; Drimyphy’ta 
(gurev, w plant), salt-plants (Cle- 
ments). 
Dromot’ropism (dpéuos, a course, 
tporh, @ turning), the irritability 
of climbing hoses which results 
in their spiral growth (Macmillan) ; 
adj. dromotrop’ic. 
Drop-dis’ease, a disease of lettuce 
ascribed to Botrytis vulgaris 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. Tainrum. 
du’plicate Par’asitism, self-parasitism, 
as in the case of mistleto upon 
mistleto. 
Dy’ad, a subdivision of a TeTrap 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]. 
dysanth’ic (dv0os, a flower), fertiliza- 
tion by the pollen from a different 
plant (K. Pearson). 
dyspho’tic, dysphotis’tic (das, gwrds, 
light), applied by A. F. W. 
Schimper to the deeper situated 
BrntHos; ~ Plants, are those 
which are adapted to a minimum 
of light; dyst’ropous (rpory, a 
turning), injurious insect-visiting, 
so far as the flowers are concerned ; 
Dys’tropy, the condition described. 
Dys’sophytes, -ae (diccos, two-fold, 
gurov, a plant). Clements’s term 
for plants which are sometimes 
hydrophytes and sometimes aero- 
phytes; the author gives the de- 
rivation as from ‘‘ dvecos, double.” 
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