oligomerous 
Oomycetes 
or brass; it kills delicate cells 
of Spirogyra ; oligom’erous (Epos, 
a part), parts consisting of few 
members ; Oligom’ery, of few 
parts ; oligope’lic (mys, clay), 
applied to plants which prefer 
certain rocks which yield 4 small 
amount of clayey detritus (Thur- 
mann); oligopsam’mic (duos, 
sand), for plants affecting certain 
granite and dolomite formations 
(Thurmann) ; both of these classes 
belong to the DYSGEOGENOUS series ; 
Oligophyl’la(pv\\ov,a leaf), Necker’s 
expression for a bract; oligophyl’- 
lous, having few leaves; oligosperm’- 
ous, -mus (orépya, a seed), few- 
seeded ; oligoste’monous (oTjuwy, a 
thread), with few stamens; Oli- 
gotax’y (rds, order), the decrease 
in the number of whorls in a flower ; 
oligotrop’ic (rpor}, 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, méradov, a 
flower-leaf), the floral envelopes 
changed partially or wholly, as 
stamens or pistils changed into 
petaloid organs. 
Om’brophile (6ufpos, a storm, ¢gidéw, 
T love), Wiesner’s term for a plant 
which likes rain ; ombroph’‘ilous, 
rain-loving ; Ombroph’ily, the con- 
dition described; Om’brophobe 
(p6Bos, fear), a similar term for a 
plant disliking rain ; ombroph’obic, 
hating rain ; Ombroph’oby, dislike 
or impatience of rain. 
omnivorous (omnivorus, all devour- 
ing), applied to parasites which 
attack many species and are not 
confined to one host-plant. 
Omoplephy’tum (duomrdexyns,  inter- 
laced, ¢urév, a plant), applied to a 
monadelphous flower, the stamens 
being in one bundle. 
Om’phalode, Omphalo'dium (dugaros, 
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, 
Jorma, 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 (dvoua, a name, Adbyos, 
discourse), the rules to be observed 
in the construction of names. 
Ontog’eny (dv7a, things existing, 
yévos, race, offspring), the develop- 
ment of an individual in its various 
stages ; adj. ontogenet’ic. 
ooblas’tic (wov, an egg, Braces, a 
bud) Fil’aments, see next ; Ooblas- 
te’ma (BAdornua, a sprout) Fil’a- 
ments, the FrRTILISING TuBES of 
Schmitz; O’ocyst (xioris, a bag), 
a female organ, an OoconruM ; 
Oogam’ete (+ GAMETE), a female 
gamete (Hartog) ; oog’amous (ydsos, 
Marriage), conjugation in which 
the two coalescing gametes are 
of dissimilar form; Oog’amy, the 
reverse condition of Isocamy; 
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 
(yéveors, beginning), the formation 
of the OosPpHERE, the early stage of 
the ovule; O’ogone, Oogo'nium, pl. 
Oogo'na (yovn, race, offspring), 
a female sexual organ, usually a 
spherical sac, containing one or 
more oospheres; ookinet‘ic (xiyy- 
Ttxos, putting in motion), tending 
to produce the female element ; 
Ool’ysis (Avois, a loosing), viri- 
descence, especially in carpels and 
ovules (Penzig) ; Oomyce’tes (uviKys, 
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