isadelphous 



isomeroas 



hood, the number of stamens in the 

 two jihalanges being equal. 



I'eatin, the colouring principle of 

 woad, Isatis tindoria, Linn. 



isidloid, resembling tlie Lichen genus, 

 Isidium ; isidiif erous (/?ro, I bear), 

 bearing a thallus like the genus 

 ■whence it derives its name. 



isid'iose [lens = a genus of corals ; 

 + OSUS) ; isidio'sus, having jiowdery, 

 coral-like excrescences ; Isid'iuni 

 {ilZos, like), the coral-like elevation of 

 a Lichen thallus with a globule on it. 



I'slands, a term applied to isolated 

 strands of ])hloera in the xylem. 



i'so- [i(Tos, equal to), Drude's prefix 

 to denote the uniformity as to li?,'ht, 

 temperature and raiu, of certain 

 gi'oups of i)lants; isoand'rospore (+ 

 Andhospore), Janet's term for the 

 spermatozoids of Marchantia ; iso- 

 bilat'eral {bis, twice ; latus, lateris, 

 a side), capable of being divided 

 into two similar halves ; isobria'ttis, 

 dicotyledonary ; isob'rious {^piaoi, I 

 strengthen), of equal sti'cngth, refer- 

 ring to the embryo of Dicotyledons ; 

 I'socheira {x^i/j-a, winter\ the iso- 

 thenn of the coldest months ; iso- 

 cho'mous (x'^M«j a mound), applitd 

 to branches springing from the same 

 stem at tlie same angle ; isocot'ylous 

 (-j- Cotyledon), having equally 

 developed cotyledons ; isochro'mouB 

 {xp<*>iJia, colour), all of one colour or 

 hue, uniform in tint ; isocy'clic 

 {kvk\os, a circle), encyclic, a Rower 

 having isomerous v.horls ; isodia- 

 met'ric (Sm, through ; jnerpou, a 

 measure), of equal dimensions 

 Cells, those haviug an equal dia- 

 meter in each direction ; Isodi'ode 

 (EloSos, a passage), when all the 

 Diodes produced are alike (Van 

 Tieghem); Isodi'ody tlic condition 

 of producing Diodes which give 

 rise to unisexual prothallia (Van 

 Tieghem) ; isody'namous {dvyaf.as, 

 power), equally developed. 



Isoe'toid, applied to a leaf wliich is 

 linear, undivided, terete, often 

 tubular, and sessile, which occurs 

 in Isoetes, niularia, etc. (Warming), 



~ I 



Isogam'ete {^(tos, equal ; yafjLerrjs, a 

 spouse), gametes or sexual cells of 

 similar size and appearance, which 

 conjugate and rtsult in a zygote ; 

 Isogametang'iu2n(-j-GAMETANGiUM) 

 the organ which produces isogametes ; 

 isogametan'gial, pertaining to an 

 isogametangiura ; '-' -copula'tion, 

 when the gametangia and nuclei 

 are alike (Hartmann) ; isog'amous 

 {yajj-os, marriage), used for those 

 plants Avhich produce isogametes ; 

 Isog'amy, the fusion of similar 

 sexual cells ; isogenotyp'ic ( + 

 Genotype), Avhere two or more 

 generic names have been applied to 

 the same type species ; isog'enous 

 {yevos, race), employed by Johannsen 

 for individuals which belong to the 

 same "genotype," i. e. = biotype; '^ 

 Induc'tion, used by Is'oll to express 

 sensitive movements arising from a 

 single cause ; isog'onous {yovos, off- 

 spring), used of hybrids which com- 

 bine the parental characters in equal 

 degree (De Vries) ; cf. anisogox- 

 ous ; Isogyn'ospore (+ Gynospore), 

 .Tanet's term for the egg of Mar- 

 chantia ; iBOg'ynous [ywi], a woman), 

 having the pistils similar ; isogy'rus 

 X {yvpbs, round), forming a complete 

 spire; Isoholog'amy {'6\os, whole; 

 ytxjios, marriage), Avhen the coales- 

 cing individuals are entirely alike 

 (Hartmann); isolat'eral [lateralis, 

 pertaining to the side), (1) equal 

 sided; (2) employed by Heinricher 

 for ''central"; '~ Leaves, those 

 which possess palisade tissue on 

 both surfaces. 



leola'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 tliat species 

 or kind (Romanes). 



Isomalt'ose [iaos, equal to ; -f Maltose), 

 a product of amylodextrin, passing 

 by fermentation into maltose ; iso- 

 mer'ic, isom'erous, -us {fj-epos, a 

 part), (1) haviug the same elements 

 in the same proportions, but with 

 different properties ; (2) having 



203 



