Initials 
(SUPPLEMENT) 
ixous 
Init/ials, the beginnings of tissues, 
the early stages of cells or tissues, 
as Dermat’ogen ~, or Per’iblem~. 
inophyl’lous (ls, lvos, a nerve, 
pidrov, a leaf), with thread-like 
veins in the leaf (Heinig). 
in‘ops (Lat., destitute), poor, de- 
ficient (Heinig). 
Inotag’mata, pl. (+ Taama), the 
hypothetical contractile elements 
of protoplasm (T. W. Engel- 
mann). 
in’quinant (inguino, I stain), stained 
or staining. 
interbiomor’ic (+ Bromorz), em- 
ployed to denote the condition of 
Hya.opuasoM ; interfo’liate, inter- 
fo’'liar (+ Fo.toLe), between the 
leaves, or between the leaves and 
some other structure ; interproto- 
plas’‘mic (+ ProropLasm) Spa‘ces, 
gaps in the reticulum of Myxo- 
gastres; intersem’inal, between or 
amongst seeds, as scales on the 
torus of Anthemis; interspor’al 
(cmopd, & spore), in a sporangium, 
situated between the spores 
(Harper) ; interplacen’tal (+ Pia- 
cENTA), between the placentas ; 
applied to vascular bundles which 
occur in the capsule; cf. ANTE- 
PLACENTAL ; intertrop’ic (+ TRo- 
Pic), relating to the torrid zone; 
within the tropics; In’terzones 
(+ Zone) Bessey’s term for the 
portion of a Diatom frustule which 
in some cases lies between the 
girdle and the valves. 
in’tra-axil'lary (+ AXILLARY), within 
the axil, as many leaf-buds; in- 
tracutic’ular (+ CUTICLE), within 
the cuticle ; applied to parts or 
organs whose normal position is 
outside ; intrapal’ear (+ Para), 
referring to the fertilization of 
cereals which commonly takes 
place within the flower, before the 
exsertion of the anthers; intra- 
sac’cal (+ Sao) employed of em- 
bryos, arising outside the embryo- 
sac; intrastamin’eal (+ SramMeEn), 
within the stamens, as the disk of 
Anacardiaceae. 
333 
intromar’ginal, (+ MARGINAL), used 
of a vein running just within the 
outer margin of a leaf. 
Intumes’cence (intumescere, to swell- 
up), any abnormal swelling on the 
exterior of plants. 
Inva’sion, (invasus), an intrusion of 
an alien plant into regions or 
stations foreign to it. 
Ton (ov, neut. of idv, past part. of 
elul, I for a physical term, defined 
by J. F. Clark as the division of a 
molecule; adj. ion’ic; Ioniza’tion, 
the partitioning of a molecule ; 
ioni’zed, divided into ions. 
is‘abelline, sabelli’nus (Isabella, 
Queen of Spain), a greyish drab. 
isocot’ylous (+CotTyLEpDoN), having 
equally developed cotyledons ; 
Isodi’ode (+Dr1op«), when all the 
diodes produced are alike (Van 
Tieghem) ; isog’onous (yévos, off- 
spring), used of hybrids which 
combine the parental characters 
in equal degree (De Vries); ¢f. 
ANISOGONOUS ; isolat/eral (/atus, a 
side), employed by Heinricher for 
“central” ; ~ Leaves, those which 
possess palisade tissue on both 
surfaces. 
Isola'tion (Fr., isolation, insulation, 
from insula, an island), the pre- 
vention of intercrossing between a 
separated section of a species or 
kind, and the rest of that species 
or kind (Romanes). 
I’somorph (op¢), shape), similar in 
external form, but not in essential 
structure; a mineralogical term ; 
Isomorph’ism, the condition de- 
scribed, as exemplified by the out- 
ward agreement of purple Crocus 
and Colchicum ; isoph’agous (¢dyos, 
a glutton), applied to parasitic 
Fungi confined to one species 
(Eriksson) ; isophyl’lous (pvAAov, a 
leaf), leaves alike, in shape or size ; 
Isophytot‘onus (pvrdv, a plant, 
révos, strain), in temperature iden- 
tical with the plant’s requirements 
(Clements). 
ix’ous (léds, _ bird-lime), 
viscous (Heinig). 
sticky, 
