Homoplast 
hornus 
origin, as Cacti and succulent 
Euphorbias; Hom’oplast, corres- 
pendence in external form, but dis- 
tinct in nature ; adj. homoplas’tic, 
Hom’oplasy, moulded alike but of 
different origin, analogous, not 
homologous, cf. Homopiasmy ; 
homos’porous (c7ropa, seed), similar- 
seeded, in opposition to HETERO- 
SPOROUS; hom’ostyled (+STYLE) 
= HOMOGONOUS; Homostyl'ia, homo- 
gonous plants; homothal’amus 
(@4Xamos, @ room, bride-chamber), 
resembling the thallus, used for 
Lichens only ; homot’ropal (rpor7, 
a turning), applied to organs having 
the same direction as the body to 
which they belong ; homot’ropous, 
-pus (1) curved or turned in one 
direction ; (2) used of an anatropous 
ovule having the radicle next the 
hilum ; Hom’otype (rémos, form, 
type) (1) correspondence of parts ; 
(2) in nuclear division this term is 
applied to those cases resembling 
ordinary karyokinesis, save in minor 
respects, immediately following the 
HeEtTERoryPs; in some cases itoccurs 
in all the stages after the Hetero- 
type, in which the reduced number 
of chromosomes are retained up to 
the formation of gametes (Farmer) ; 
homotyp’ic, homologous; Homo- 
typy, the condition of corres- 
pondence of parts which are in 
series. 
Hon’ey, the sweet secretion from 
glands or nectaries, which acts as 
an inducement to insect visitors; 
~ Cup, used by Withering for 
nectary ; ~ Dew, a sweet secretion 
voided by aphides from the juices 
of their host-plants; ~ Guides, 
lines or streaks of honey or colour 
leading to the nectary; ~ Pore, 
a supposed pore or gland which 
secretes honey ; ~Spot= ~GuIpEs ; 
Hon’eycomb-cells, in Diatoms, hexa- 
gonal hollows, as in T'riceratium 
Favus, Ehrenb, ; hon’eycombed, 
alveolate. 
Hood, = CucuLius; hood’ed, Hood- 
shaped (Crozier) = CUCULLATE. 
Hook, a slender process, curved or 
bent back at the tip; ~ Cli/mbers, 
lants which support themselves 
by hooks or prickles,asthe bramble; 
hooked-back, curved in a direction 
from the apex to the base as the 
side lobes in a dandelion leaf. 
Hoop, the zone or girdle of Diatoms, 
the connection between the valves 
of the frustule. 
hora’rius, hor’ary (hora, an hour), 
lasting an hour or two, as the ex- 
panded petals of Cistus. 
hordea‘ceus (Lat. pertaining to 
barley), shaped like an ear of 
barley ; Hor’dein, a starch-like sub- 
stance in barley. 
horizon'tal, horizonta’lis (éplfwy, the 
circular boundary of vision), level; 
Hovizon’tal Sys’tem, the cellular, as 
distinguished from the fibro-vascu- 
lar system (Crozier). 
Hor’mogon (Crozier) = Hor’mogone, 
Hormogon'ium (&ppos, necklace, 
yévos, offspring), in filamentous 
Algae, those pertions composed 
of pseudocysts marked off by 
heterocysts which become de- 
tached, and after a short period of 
spontaneous motion, come to rest 
and develop into new filaments ; 
Hor’mospores (o7opda, seed), a term 
used by Minks for spores which 
are similar in origin to stylo- or 
teleutospores of Fungi, colourless, 
dividing into cells, microgonidia, 
etc., with diliquescence of the 
mother-cell, the microgonidia de- 
veloping into heterocysts. 
Horn (1) any appendage shaped like 
an animal’s horn, as the spur in 
Linaria ; (2) the antheridium of 
Vaucheria ; Horn'let, a little horn 
(Crozier); hor’ny, corneous as to 
texture. 
Horn’bast (Ger. ),a tissueof obliterated 
groups of sieve-tubes, specially 
thickened and of horny texture 
(Wigand). 
hornot’inus, hor’nus (Lat.), of this 
year, the present year’s growth; 
Ra’mi hor’ni, branches not a twelve- 
month old. 
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