oligomerous 



Oomycetes 



or brass ; it kills delicate cells 

 of Spirogyra ; oligom'erous (/^pos, 

 a part), parts consisting of few 

 members ; Oligom'ery, of few 

 parts ; oligope'lic (irrjXbs, clay), 

 applied to plants which prefer 

 certain rocks which yield a small 

 amount of clayey detritus (Thur- 

 mann) ; oligopsam'mic (i/'d/A/ios, 

 sand), for plants affecting certain 

 granite and dolomite formations 

 (Thurmann) ; both of these classes 

 belong to the DYSGEOGENOUS series ; 

 Oligophyl'la( ^vXXov, a leaf) , Necker 's 

 expression for a bract ; oligophyl'- 

 lous, having few leaves; oligosperm'- 

 ous, -mus (ffirtpiia, a seed), few- 

 seeded ; oligoste'monous (<rT-/nj.wv, a 

 thread), with few stamens ; Oli- 

 gotax'y (T({IS, order), the decrease 

 in the number of whorls in a flower ; 

 oligotroplc (rpoTTTj, a turning), em- 

 ployed by Loew for bees which 

 visit a restricted range of plants. 



oliva'ceous, -ceus (oliva, an olive, + 

 aceous) ; oli'veus (Lat.), the colour 

 of a ripe olive ; olivas'cens (Lat.), 

 turning olive - coloured ; olivae- 

 form'is (forma, shape), shaped like 

 an olive, drupaceous ; ol'ive-colour, 

 ol'ive-green, yellowish green dark- 

 ened with black ; olivic'olor (color, 

 colour) = OLIVACEOUS. 



olopetalar'ius (#\os, whole, irtraXov, a 

 flower-leaf), the floral envelopes 

 changed partially or wholly, as 

 stamens or pistils changed into 

 petaloid organs. 



Om'bropnile (6/mppos, a storm, 0iXew, 

 I love), Wiesner's term for a plant 

 which likes rain ; ombroph'ilous, 

 rain-loving ; Ombroph'ily, the con- 

 dition described ; Om'brophobe 

 (<o/3os, fear), a similar term for a 

 plant disliking rain ; ombroph'obic, 

 hating rain ; Ombroph'oby, dislike 

 or impatience of rain. 



onmiv'orous (omnivorus, all devour- 

 ing), applied to parasites which 

 attack many species and are not 

 confined to one host-plant. 



Omoplepliy'tiini (ojuoTrAe/oJs, inter- 

 laced, Qvrbv, a plant), applied to a 



monadelphous flower, the stamens 

 being in one bundle. 



Om'phalode, Omphalo'dium (6{j,<f>a\os, 

 navel, elSos, like), the mark in the 

 hilum through which the vessels 

 pass to the chalaza. 



one-ribbed, having one prominent 

 rib, as in the leaves of many 

 grasses ; ~> si'ded, (1) turned to one 

 side ; (2) the parts turned the same 

 way ; (3) unequal sided. 



onisciform'is (oniscus, a wood-louse, 

 forma, shape), Koerber's word for 

 certain Lichen-spores resembling 

 a wood-louse in shape ; onis'cus 

 (Lat.), used for lead-coloured, from 

 the tint of the same creature. 



Onomatolo'gia (6vofj.a, a name, \6yos, 

 discourse), the rules to be observed 

 in the construction of names. 



Ontog'eny (6vra, things existing, 

 yevos, race, offspring), the develop- 

 ment of an individual in its various 

 stages ; adj. ontogenet'ic. 



OOblas'tic (wov, an egg, jSXaoros, a 

 bud) FiTaments, see next ; Ooblas 

 te'ma (/3Xa<rr?7/xa, a sprout) Fil'a- 

 ments, the FERTILISING TUBES of 

 Schmitz ; O'ocyst (/cu<ms, a bag), 

 a female organ, an OOGONIUM ; 

 Oogam'ete (+ GAMETE), a female 

 gamete (Hartog) ; ooff'ainous (7^05, 

 marriage), conjugation in which 

 the two coalescing gametes are 

 of dissimilar form ; Oog'amy, the 

 reverse condition of ISOGAMY; 

 the female gamete never active, 

 the male a spermatozoon, and the 

 product an OOSPERM (Hartog) ; 

 Oogem'ma (gemma, a bud), Caruel's 

 term for ARCHEGONIUM ; Oogen'esis 

 (7&/e<m, beginning), the formation 

 of the OOSPHEKE, the early stage of 

 the ovule ; O'ogone, Oogo'nium, pi. 

 Oogo'nia (yovrj, race, offspring), 

 a female sexual organ, usually a 

 spherical sac, containing one or 

 more oospheres ; ooldnet'ic (idvt)- 

 rt/coj, putting in motion), tending 

 to produce the female element ; 

 Ool'ysis (Xu<m, a loosing), viri- 

 descence, especially in carpels and 

 ovules (Penzig) ; Oomyce'tes 



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