Diaphototropism 
(SUPPLEMENT) 
Dischisma 
Diaphototrop’ism (64, through,+ 
Pxorotropism), the act of placing 
at right angles to incident light ; 
adj. diaphototrop’ic. 
dibot/ryal = DIBOTRYOID. 
dichoblast’ic (diva, two ways, BXacrés, 
a shoot), Celakovsky’s term for 
branching intermediate between 
his acro- and pleuro-blastic condi- 
tions, it apparently occurs in the 
embryo of Pteridophytes ; dicho- 
dy’namous, dichodynam’ic (dvvap.s, 
power), applied to hybrids in which 
the characters of both parents are 
equally represented ; dichopod’ial 
(166.ov, a small foot), when an axis 
repeatedly forks giving rise to an 
inflorescence termed a Dicho- 
podium (Pax) ; dichotyp’ic (rv7os, 
type), the appearance of two or 
more types on the same plant 
(Focke). 
Dicot’ylae, an abbreviation of Dicoty- 
ledonae; dicot’ylous = DICOTYLE- 
DONOUS. 
dicrana’ceous, resembling the Moss 
Dicranum. 
Dict’ydin, a substance found by Jahn 
in Dictydium umbilicatum, as 
granules which resist both acids 
and alkalis. 
Dictyosporan’gium (dikrvoy, a net, + 
SPORANGIUM), the sporangium of 
Saprolegnia, with encased spores 
germinating within the sporangium 
(Walpole and Huxley) ; Dict’yostele 
(+STELE) a stele with large over- 
lapping leaf-gaps; siphon’ic ~ ,when 
the network of meristeles is simple 
and tubular (Brebner); adj. dicty- 
oste’lic ; Dictyox’ylon (£vAov, wood), 
applied to the cortex of a fossil 
stem possessing a netted system of 
hypodermal fibrous strands, as in 
Lyginodendron (Scott). 
Dictyu’chus State of Saprolegnieae, 
= Dicryosporaneium (Hartog), 
Dientomoph’ily (+ ENToOMoPHILY), 
when in a species, some individuals 
are adapted for insect-fertilization 
by a different group of visitors 
from the remaining individuals 
(Engler and Prantl); Diete’siae 
(érjovos, annual), perennials with 
short shoots, long shoots being 
absent or fugacious (Krause) ; 
Dimonoe’cism (+ Monorctsm), the 
condition of two out of three kinds 
of monoecious flowers, having per- 
fect flowers, and (a) male, (b) 
female, or (c) neuter flowers also 
(Knuth). 
Diffu’sion, stat‘ic, in botany, the 
absorption of gaseous bodies 
through stomata and diffusion 
through tissues; Diffusiv’ity, the 
ratio of such diffusion. 
Digest/ive-cells, of the mycorrhiza of 
Neottia ; ef. Host-cEtzs. 
dimeroste’lic (+ MrristTeLe), two 
meristeles or vascular bundles 
(Brebner). 
Di’odange (+ Diop, dyyetov, a vessel), 
a group of diodes surrounded by 
one or more layers of sterile cells 
(Van Tieghem). 
Dioe’cism, the condition of dioecious 
plants or flowers. 
Dip’lonasty (vacrds, pressed close), 
when organs grow faster on the 
upper and the under surfaces than 
on the sides. 
diplox’yloid, resembling the genus 
Diploxylon (Williamson), 
diplos’tichous (crixos, a row), in two 
series or rows; diplox’ylous=DIP- 
LOXYLIC. 
Disassimila’tion, the breaking down, 
katabolism of plants. 
Disc or Disk, add, (7) the expanded 
base of the style in Umbelliferae ; 
(8) in a bulb, the solid base of the 
stem, around which the scales are 
arranged. 
Dis’cals, Bessey’s proposed abbrevia- 
tion of Disciflorae, a series of poly- 
petalous Phanerogams. 
Discentra’tion (dis, be centrum, 
centre), used by ©. F. Schimper 
for (a) fasciation of the axis, and 
(b) multiple of a leaf-organ (Penzig). 
Dischis’ma (dls, two, cxloua, separa- 
tion), the fruit of Platystemon, 
which divides into longitudinal 
carpels, each of which again 
divides transversely. 
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