diaphyllous 
Diclesium 
from the cavity of the macrospore 
in Vascular Cryptogams;  dia- 
phyl'lous (¢vA\oy, a leaf) = pDIa- 
LYPHYLLOUS ; Diaph’ysis (¢vw, to 
make grow), proliferation of the 
inflorescence. 
di’arch (dls, two, dpyh, beginning), 
two protoxylem groups, used of the 
steles of roots; diari‘nus (dppyv, 
male), Necker’s term for dian- 
drous. 
Di‘astase (dkdoracts, standing apart), 
an amylolytic enzyme which con- 
verts starch into malt-sugar ; ~ 
of Transloca’tion, attacks starch 
grains gradually over their whole 
surface, it is almost universally dis- 
tributed in plants ;~ of Secre’tion, 
acts by corrosion, attacking parts 
of the starch-grain first; it is 
formed by the glandular epithelium 
of the scutellum of grasses; adj. 
diastat’ic, 
Di'aster (dls, two, dorip, a star) see 
DYASTER. 
Diast’ole (diacro\y, separation), the 
slow dilation of a contractile vesicle ; 
cf. SYSTOLE. 
Diatherm’ancy (5:4, through, depyatyw, 
I warm), the relative conductivity 
of a medium with regard to the 
transmission of heat (T. W. Engel- 
mann). 
diatoma’ceous, resembling or consist- 
ing of diatoms whose type is Dia- 
toma; Diat/omine, the colouring 
matter of Diatoms, phycoxanthine ; 
Diat/omist, one devoted to the 
study of Diatoms; Diat’omphile 
(giréw, I love), an enthusiastic 
student of Diatoms. 
diatrop ic (6:4, through, rpéos, twin- 
ing), used of organs which place 
themselves transversely to the 
operating force. 
dibot’ryoid (dls, double, + botryoid), 
a@ compound inflorescence, the 
branches of the first and succeed- 
ing orders being botryoid, such as 
the compound umbel, panicle, or 
spike. 
Dicar’otin (d's, twice, + CAROTIN), a 
lipochrome pigment; dicarp’ellary 
76 
(kapros, fruit), composed of two 
carpels or pistil-leaves. 
dicha’sial (d.xdéfw, I disunite), re- 
lating to a DicHasium ; ~ Cymes, 
cymes whose secondary members 
are dichasia, such as occur in 
Euphorbiacee ; Dicha’sium, a false 
dichotomy in which two lateral 
shoots of nearly equal strength 
arise from the primary axis below 
the flower which terminates the 
apex, the process being repeated 
by each set of branches; a two- 
parted or two-ranged cyme; dich- 
ast’ic, spontaneously dividing ; 
dichlamyd’eous (yAapis, yAaptdos, 
a cloak), having a double perianth, 
calyx and corolla; dichoblas’tic 
(B\aords, a shoot), suggested by 
Celakovsky to replace ‘‘dichoto- 
mous” when the repeated dicho- 
tomy develops into a sympodium ; 
dichog’amous (dixa, in two, ydpos, 
marriage), hermaphrodite with one 
sex earlier mature than the other, 
the stamens and pistils not syn- 
chronizing ; Dichog’amy, insuring 
cross-fertilization, by the sexes not 
being developed simultaneously. 
Dichocarp’ism (d:xorouéw, I cut in 
two, xaprés, fruit), Cooke’s term 
for Fungi producing two distinct 
forms of fructification, dimorphic 
as to fruit ; dichot’/omal, pertaining 
to a bifurcation, as a~Flow’er, one 
seated in the fork of a dichasium ; 
dichot’omize, to fork or divide in 
pairs; dichot’omous, -us, forked, 
parted by pairs ;~ Cyme, of English 
authors=DicHasiumM ; Dichot’omy, 
the state of being repeatedly forked; 
— hel’‘icoid ~, in each successive 
forking, the branch which continues 
to develop is on the same side as 
the previous one, the other branch 
aborts; False ~, = DIcHasIUM; 
scorp‘ioid ~, the branches de- 
velop on each side alternately ; 
Dichot’ypy (rvmos, a type), the oc- 
currence of two different forms of 
the same organ on the same stock. 
Dicle’sium (dts, twice, xAjors, closing), 
an achene within a separate and free 
