Ormogon 
ovate 
fertilised by pollen brought by. 
birds ; adj. ornithoph’ilous. 
Or’mogon, cited by Crozier, = Hor- 
MOGONE. 
Or’thoblast (dp60s, upright, Bracres, a 
bud), used by Cramer for confer- 
void prothallia growing in an 
ascending direction; Orthophoto- 
tax’y (pos, gwrds, light, rdés, 
order), the direct arrangement of 
such organisms as Volvox and 
Spirogyra assumed under the 
stimulus of light (Oltmanns); or- 
thophototrop‘ie (zpory, a turning), 
the direct influence of light shownin 
Vaucheria, Phycomyces, and shoots 
of flowering plants (Oltmanns). 
Orthoploc’eae (7oxh, a twining), those 
Cruciferae which have conduplicate 
cotyledons; orthoplo’ceous, -ceus, 
when the incumbent cotyledons 
are folded round the radicle; Or- 
thosper’meae (ocmépua, a seed), 
plants whose seeds have albumen 
flat on the inner face, neither in- 
volute or convolute; Or’thostichy, 
pl. Or’thostichies (c7lyos, a row), a 
vertical row, as in phyllotaxis ; 
orthos’tichous, straight ranked ; 
orthos’‘tomous (c7dua, a mouth), 
with a straight opening ; ortho- 
tac’tic (rdéis, order), used by S. 
Moore in the sense of normal, ap- 
plied to an interval in the Paor- 
RUM; orthot/ropal, orthot’ropous 
(rporh, a turning), used of an ovule 
with a straight axis, the chalaza 
being at the insertion and the ori- 
fice or foramen at the opposite end, 
farthest from the hilum; ortho- 
tropic, assuminga vertical position. 
Oryg’oma (Spvyua, a ditch or pit), 
Necker’s term for the cup of a 
Marchantia containing gemmae. 
Os, Or’is (Lat.), a mouth or orifice. 
oscillating = VERSATILE ; oscilla’nus, 
oscillator’ius (Lat. from oscillatio, 
a swinging), has the same meaning. 
Os’culum (Lat. a little mouth) = 
OstTIOLE. 
Osmom’eter (wcuos, a thrusting, 
werpov, ® Measure), an instrument 
to measure Osmosis; Os’mose, 
Osmo'sis, the diffusion of liquids 
through membranes ; adj. osmo’tio 
os’seous, os’seus (Lat.), bony. 
Ossic'ulus, Ossic’ulum (Lat., a little 
bone), the pyrene of a fruit, as a 
medlar. 
os’sified (08, ossis, a bone, facio, J 
make), becoming hard as bone, as 
the stones of drupes, such as the 
peach and plum. 
Ostariphy’tum (dcrdpiov, a little bone, 
gvrov, a plant), a plant which pro- 
duces a drupe or drupe-like fruit. 
Osteoscle’reids (éc7éov, a bone, 
okdnpos, hard), the ‘‘ bone-shaped ” 
sclereids of Hakea, 
os'tiolate, ostiola’tus (ostiolum, a little 
door), furnished with an opening or 
mouth ; Os’tiole, Os‘tiolum, (1) the 
opening of the conceptacle in some 
Algae; (2) the aperture through 
which spores escape from the peri- 
thecium. 
ostracodermat’inus (3crpaxoy, a hard 
shell, depudrivos, leathern), resem- 
bling the shells of mollusca, applied 
to certain Lichens. 
-o’sus, a termination indicating aug- 
mentation, as radio’sus, large- 
rooted. 
out’er, exterior, abaxial; ~ Glumes, 
one or more glumes at the base of 
a spikelet in grasses, enclosing one 
or more flowers; ~ Perid’‘ium = 
PERIDIUM EXTERNUM. 
Out’growth, (1) another name for 
- EMERGENCE ; (2) a tuberous excre- 
scence on roots. 
Out‘line, the continuous boundary- 
line of an organ, as a leaf. 
o’val, ova‘lis (ovum, an egg), broadly 
elliptic. 
Ovarioph’ylly (‘‘w&dpiov, ovulum,” pur- 
ov, a leaf), descending metamorpho- 
sis of a carpel into a leaf (Morren), 
O'vary, Ova'riwm (ovum, an egg), that 
part of the pistil which contains 
the ovules, the immature fruit, 
formerly termed the GERMEN. 
o’vate, ova’tus (Lat., egg-shaped), (1) 
shaped like a longitudinal section 
of a hen’s egg, the broader end 
basal ; (2) used for ovoid, 
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