oligomerous 



Oomycetes 



or brass ; it kills delicate cells 

 of Spirogyra ; oligom'erous (ntpos, 

 a part), parts consisting of few 

 members ; Oligom'ery, of few 

 parts ; oligope'lic (707X6*, clay), 

 applied to plants which prefer 

 certain rocks which yield a small 

 amount of clayey detritus (Thur- 

 mann) ; oligopsam'mic (\f/d/j.fws, 

 sand), for plants affecting certain 

 granite and dolomite formations 

 (Thurmann) ; both of these classes 

 belong to the DYSGEOGENOUS series ; 

 01igophyria(0yXXov,aleaf),Necker's 

 expression for a bract ; oligophyl'- 

 lous, having few leaves; oligosperm'- 

 ous, -mils (o-Tr^ua, a seed), few- 

 seeded ; oligoste'monous (<TT^/J.UV, a 

 thread), with few stamens ; Oli- 

 gotax'y (rcifis, order), the decrease 

 in the number of whorls in a flower ; 

 oligotrop'ic (T/HJTTTJ, 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 (SAos, whole, ir^raXov, a 

 flower-leaf), the floral envelopes 

 changed partially or wholly, as 

 stamens or pistils changed into 

 petaloid organs. 



Om'brophile (6>/3pos, a storm, 0tAe'w, 

 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'otaic, 

 hating rain ; Ombroph'oby, dislike 

 or impatience of rain. 



omniv'orous (omnivorus, all devour- 

 ing), applied to parasites which 

 attack many species and are not 

 confined to one host-plant. 



Omoplephy'tum (o^oTrXe/cT/s, inter- 

 laced, <f>vTbi>, a plant), applied to a 



moiiadelphous flower, the stamens 

 being in one bundle. 



Om'phalode, Omphalo' dium (6/j.<j>a\os, 

 navel, eldos, 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, X6-yos, 

 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 (uov, an egg, /SXacrros, a 

 bud) Fil'aments, see next ; Ooblas- 

 te'ma (/SXao-r^jua, a sprout) Fil'a- 

 ments, the FERTILISING TUBES of 

 Schmitz ; O'ocyst (KVCTTIS, a bag), 

 a female organ, an OOGONIUM ; 

 Oogam'ete (+ GAMETE), a female 

 gamete (Hartog) ; oog'amous (yd/*os, 

 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 

 (ytveffis, beginning), the develop- 

 ment of the egg, 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 ; ookinet'ic (idvr)- 

 rtKos, putting in motion), tending 

 to produce the female element ; 

 Ool'ysis (\vais, a loosing), viri- 

 descence, especially in carpels and 

 ovules (Penzig) ; Oomyce'tes 



175 



