diclinous 
digitinervius 
covering of perianth, as Mirabilis ; 
di’clinous (dis, two, «vy, a bed), 
unisexual, having the stamens in 
one flower, and the pistils in 
another; Di’clinism, the separa- 
tion of pollen and stigma in space, 
as dichogamy is in time. 
dicoc’cous, -ws (d!s, two, kéxxos,akernel), 
having fruit of two Cocci; dicoe’lous 
(kotAos, a hollow), with two cavi- 
ties; Dicot’yls, an abbreviation 
for Dicotyledo’neae, Dicotyle’dons 
(xorvAnday, cup-shaped hollow, used 
for seed-lobe), plants of the class 
denoted by their possession of two 
cotyledons ; dicotyledonous, — nus, 
having a pair of seed-lobes. 
dictyod’romous (dixrvov, a net, 
Spoues, a course), with reticulate 
venation; Dic’tyogens (yévvaw, I 
bring forth), planis having netted 
veins, proposed by Lindley as inter- 
mediate between his ENDoGENs and 
ExoGEns ; dictyog’enous, applied to 
monocotyledons with netted veins ; 
~Lay’er, alayer of meristem general 
in monocotyledons, which gives 
rise to the central ‘‘body” and 
cortex of the young roots (Man- 
gin). 
dicy’clic (dis, two, xvxXos, a circle), (1) 
when a series of organs is in two 
whorls as a perianth ; (2) applied 
to biennials; dicy’mose (kia, a 
wave), doubly cymose ; did’romic 
(Spéuos, coarse), doubly twisted, as 
the awns in Danthonia, Stipa, etc. ; 
Did’romy, double torsion. 
did’ymous, -us (5{5uuos, twin), (1) found 
in pairs, as the fruits of Umbelli- 
ferae ; (2) divided into two lobes; 
~ An’thers, when the two lobes are 
almost destitute of connective. 
Didyna’mia (dis, twice, dvvapuis, 
power), a Linnean class marked by 
didynamous flowers; didyna’mian 
didyn’amous, four-stamened flower, 
with stamens in pairs, two long, 
two short, as in most Labiatae. 
Didy’namy, the condition above 
defined. 
diae’cious = DIOECIOUS. 
Dieres‘ilis, Dieresil‘ia (dapéw, I 
77 
divide), Mirbel’s name for Car- 
CERULE ; adj. dieresil’ian. 
Differentia'tion, of Cell-wall, the 
arising of apparent layers; ~ of 
Tissues, their development into 
permanent tissue and consequent 
diverse growth. 
diff’ luent (diflwens, dissolving), having 
the power to dissolve, or readily 
doing so. 
difformed’, difform’is (51s, apart, forma, 
shape), of unusual formation or 
shape; Difform’itas (Lat.), an 
abnormality. 
diffract’, diffrac’tus (Lat., broken), 
broken into areolae separated by 
chinks. 
diffuse’, diffu'sus (Lat.,spread abroad), 
widely or loosely spreading; ~ 
Colour, a colour which has ‘‘run” 
into the surrounding tissues ; 
Diffu’sion, (1) term used by Weisner 
for the intermingling of different 
gases under equal pressure, with or 
without intervening partitions ; (2) 
mixture of fluids, or dispersion of a 
fluid through a solid or tissue. 
dig’amous, -us (dls, twice, ydos, 
marriage), having the two sexes in 
the same cluster; as in Com- 
positae. 
dig’enous (dls, two, yévos, offspring), 
containing both sexes, or produced 
sexually ; digenet’ic, sexual. 
Digest’ive Pock’et (or Sac), an invest- 
ment of the secondary rootlets, 
which penetrate the tissues of the 
primary root till they reach the 
exterior. 
Dig’italine, an alkaloid contained in 
Digitalis purpurea, Linn. 
dig’itate, digita’tus (digitus, a finger), 
fingered ; a compound leaf in which 
all the leaflets are borne on the apex 
of the petiole, as in the Horse- 
Chestnut ; ~ pin’nate, when the 
leaflets of a digitate leaf are 
pinnate ; digita’tely, in a digitate 
manner; digitaliform’is (forma, 
shape), shaped like a finger, as the 
corolla of the Foxglove ; digitiner- 
vius (nervis, a nerve), when the 
secondary nerves of a leaf diverge 
