Divergence 
Dorsuni 
parts gradually separate as they 
lengthen, as the follicles in Asclep- 
tas; Angle of~, the angle between 
succeeding organs in the same 
spiral or whorl; diver’gent, -ens, 
diverg’ing, separating by degrees ; 
diverginer’vius (nervus, a nerve), 
with radiating main nerves. 
diversiflor’ ous, -rus(diversus, contrary, 
Jlos, floris, a flower), with flowers 
of more than one kind; diver’sus, 
(1) variable (de Candolle) ; (2) differ- 
ent or separate, 
Divertic’ulum (Lat., « byeway), in 
Algae, a protoplasmic protrusion, 
communicating with the fused 
procarp cells and the placenta, 
as in Gracilaria confervoides, Grev. 
divided, divi’sus (parted asunder), 
used where lobing or segmentation 
extends to the base; divisu’ral 
(line), the line down the teeth of 
the peristome of a Moss, by which 
the teeth split. 
Dix’eny (dls, two, Eévos, a host), where 
an autoecious parasite may infest 
two species, but does not need a 
change of host to ensure its de- 
velopment (De Bary). 
Dodecagyn’ia (dwdexa, twelve, yury, 
woman), a Linnean order of plants 
with twelve pistils ; dodecag’ynous, 
-nus, possessing twelve pistils or 
distinct carpels; dodecam’erous, 
-rus (wepos, a share), in twelve parts, 
as in a cycle; Dodecan’dria (dvip, 
dvdpos, a man), a Linnean class of 
plants with twelve stamens; 
dodecan’drian, dodecan’drous, -drus, 
of twelve stamens, normally (occa- 
sionally extended to nineteen) ; 
dodecapet’alous (7éradov, a flower- 
leaf), with twelve petals, or less 
than twenty ; dodecari’nus (dppyv, 
male), Necker’s equivalent for 
dodecandrous. 
Do’drans (Lat., a span), a full span, 
from thumb tip to extremity of the 
little finger, about nine inches, or 
23 cm. ; dodranta’lis, a span long. 
dolabra’tus (Lat.), axed, or axe- 
shaped ; dolab’riform, dolabriform’'is 
(forma, shaped), hatchet-shaped. 
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81 
doleiform’is (dolea, casks, forma, 
shape), barrel-shaped. 
dolia’rius, dolia’tus (Lat.), circinate. 
Dolichone’ma (dodlxos, long, vaya, a 
thread), the stage in nuclear divi- 
sion which immediately precedes 
synapsis in the formation of the 
reproductive cells; Dolicho’sis, 
retardation of growth in length 
(Czapek) ; Dolicho’tmema, (ryjue, 
free), a filiform cell which ruptures 
and sets free the gemma of a Moss 
(Correns). 
Doma‘tia (dwudriov, a little house), 
modified protections for shelter- 
parasites (Tubeuf), 
domestica’ted, thriving under culti- 
vation (Crozier). 
dor’mant (dormiens, sleeping), applied 
to parts which are not in active 
life, as ~ Buds, ~ Eyes, potential 
buds which normally do not shoot 
but are excited to growth by 
special circumstances; ~ State, 
the condition of a plant during 
the winter, or when inactive from 
any reason. 
dor’sal, dorsa'lis (dorsum, the back), 
relating to the back, or attached 
thereto ; the surface turned away 
from the axis, which in the case of 
a leaf is the lower surface (NoTE.— 
This is reversed by some authors) ; 
~ Su’ture, the suture of a follicle 
or legume which is exterior to 
the axis; the midrib of a carpel; 
dorsicum’bent (cwmbens, lying 
down) = SUPINE (Crozier) ; dorsif’- 
erous (fero, I bear), borne on the 
back, as the sori on most Ferns ; 
dor'sifixed, dorsifix’us (/ixus), fast), 
fixed on the back or by the 
back ; dorsiven’tral (venter, the 
belly), used of an organ which has 
dorsal and ventral surfaces, as a 
leaf ; Dorsiventral’ity, the condition 
of possessing upper and lower faces 
of an organ ; Dor’sum (Lat.), (1) the 
back, or parts of the flower which 
look to the outside ; (2) in Diatoms, 
in forms which are more or less 
lunately curved, the convex side of 
the girdle, 
