isabellinus 
isostomous 
isabelli‘nus (Mod. Lat.), Isabella 
colour, a dirty tawny tint. 
isadelph’ous, -us (isos, equal to; 
adehgds, a brother), equal brother- 
hood, the number of the stamens 
in the two phalanges being equal. 
I’satin, the colouring principle of 
woad, Isatts tenctoria, Linn. 
isid’‘ioid, resembling the Lichen 
genus, Isidium ; isidiif’erous ( fero, 
I bear), bearing a thallus like the 
genus whence it derives its name ; 
isid’‘iose, having powdery, coral- 
like excrescences. 
Tsid’ium (/ocs =a genus of corals; efdos, 
like), the coral-like elevation of a 
Lichen thallus with a globule on it. 
I’slands, u term applied to isolated 
strands of phloém in the xylem. 
isobilat’eral (icos, equal to, bis, twice; 
latus, lateris, a side), capable of 
being divided into two similar 
halves; isob’rious (fpidiw, I 
strengthen), of equal strength, refer- 
ring to the embryo of Dicotyledons; 
isobria’tus, dicotyledonary ; iso- 
cho’mous (xu, a mound), applied 
to branches springing from the same 
stem at the same angle ; isoch’ro- 
mous (xp@ua, colour), all of one 
colour or hue, uniform in tint; 
isocy’clic (kvK)os, a circle), eucyclic, 
a flower having isomerous whorls ; 
isodiamet’ric (dca, through ; «érpov, 
a measure), of equal dimensions ;~ 
Cells, those having an equal dia- 
meter in each direction ; Isodi’ody 
(dlodos, a passage), the condition of 
producing DiopEs which give rise 
to unisexual prothallia (Van 
Tieghem) ; isody’namous (divas, 
power), equally developed; Iso- 
gamete (yauérns, a spouse), gametes 
or sexual cells of similar size and 
appearance, which conjugate and 
result in a zygote; isog’amous 
(yduos, marriage), used for those 
plants which produce isogametes ; 
Isog’amy, the fusion of similar 
sexual cells ; isog’enous (yévos, race) 
Induc’tion, used by Noll to express 
sensitive movements arising from a 
single cause; isog’ynous (yu, a 
139 
woman), having the pistils similar ; 
isogy’rus ¢ (yupds, round), forming a 
complete spire; Isomalt’ose (+ 
Ma rose), a product of amylodex- 
trin, passing by fermentation into 
maltose ; isomeric, isom’erous, -us 
(uépos, a part), (1) having the same 
elements in the same proportions, 
but with different properties; (2) 
having members of successive cycles 
equal in number, as the petals and 
sepals; isoph’agous (pdyw, I eat), 
applied to Fungi which attack 
one, or several allied species (Eriks- 
son); isoph’orous (dopéw, I carry) 
transformable into something else 
(Crozier); Isoplan’ogametes (7Advos, 
wandering, + GaAMETE), motile 
sexual cells of equal size, occurring 
in Algae; isopo’lar (polus, a pole), 
an axis of Diatom frustules is so 
termed when its extremities are 
similar (O. Mueller) ; Isopro’thally 
(+ PRorHaALLus), producing pro- 
thallia which are similar in sexual 
character (Van Tieghem) ; i’soschist 
(cxio7rds, split), applied to a cell of a 
brood, all of which are equal in 
size and function (Hartog); isos- 
mot’ic (woos, impulse, pushing), 
passing by osmosis in or out with 
equal facility; I’sospore (o7opda, 
seed), a spore produced by one of 
the Isospo’reae, plants having one 
kind of spore, as in Ferns, opposed 
to heterosporous; isos’porous, 
homosporous, or having one kind 
of spore only ; Isosp’ory, the state 
of producing one sort of spore; 
isoste’monous, mus, having as many 
stamens as petals, or sepals ; Isos- 
te’‘mony, equality in number of 
stamens with the segments of the 
erianth whorls; isosty’lous (+ 
Eevves), the styles being similar, 
opposed to heterostylous ; isos’tic, 
Van Tieghem’s term when the 
mother root has more than two 
xylem bundles; isoton’ie (révos, a 
strand, a brace) Concentra’tion, 
that degree of different solutions in 
which they attract water with equal 
force (De Vries); isos’tomous (c7éua, 
