Homoplast 



hornus 



origin, as Cacti and succulent 

 Euphorbias ; Hom'oplast, corres- 

 pondence in external form, but dis- 

 tinct in nature ; adj. homoplas'tic, 

 Hom'oplasy, moulded alike but of 

 different origin, analogous, not 

 homologous, cf. HOMOPLASMY ; 

 homos'porous (cnropa., seed), similar- 

 seeded, in opposition to HETERO- 

 SPOROUS ; hom'ostyled ( + STYLE) 

 = HOMOGONOUS; Homostyl'ia, homo- 

 genous plants ; homothal'amus 

 (6a\a/ji.os, a room, bride-chamber), 

 resembling the thallus, used for 

 Lichens only ; homot'ropal (TPOTTTJ, 

 a turning), applied to organs having 

 the same direction as the body to 

 which they belong ; homot'ropous, 

 -pits (1) curved or turned in one 

 direction ; (2) used of an anatropous 

 ovule having the radicle next the 

 hilum ; Hom'otype (rviros, 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 

 HETEROTYPE; in some cases it occurs 

 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- 

 t'ypy, 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 = ~ GUIDES ; 

 Hon'eycomb-cells, in Diatoms, hexa- 

 gonal hollows, as in Triceratium 

 Favus, Ehrenb. ; hon'eycombed, 

 alveolate. 



Hood, = CUCULLUS ; hood'ed, Hood- 

 shaped (Grozier) = CUCULLATE. 



Hook, a slender process, curved or 

 bent back at the tip ; ~ Cli'mbers, 

 plants which support themselves 

 by hooks or prickles, as the 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 Cisttis. 



hordea'ceus (Lat. pertaining to 

 barley), shaped like an ear of 

 barley ; Hor'dein, a starch-like sub- 

 stance in barley. 



horizon'tal, horizouta'lis (bpifav, the 

 circular boundary of vision), level ; 

 Horizon'tal Sys'tem, the cellular, as 

 distinguished from the fibro-vascu- 

 lar system (Crozier). 



Hor'mogon (Crozier) = Hor'mogone, 

 Hormogon'ium (cp/j.os, necklace, 

 y6vos, offspring), in filamentous 

 Algae, those portions 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 (cr-n-opa, 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 tissue of 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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