Heteroprothally 



Hexagonienchyma 



Tieghem's term for the production 

 of unisexual prothallia ; hetero- 

 rhi'zal {^ICa, & root), having roots 

 or similar organs proceeding from 

 any indeterminate portion of a spore 

 in germination or rooting from no 

 fixed point; HeteroscM'zis (<rx^C«> 

 I split), the simultaneous fragment- 

 ation of the mother nucleus, giving 

 rise to many (Griggs) ; Heterosepal- 

 o'if ( + Skpalody), the change of 

 one sepal into another (Worsdell) ; 

 Heterosper'my {(nripixa, seed), bear- 

 ing two kinds of seeds, as in Suaeda, 

 some species producing both seeds 

 with endosperm, and other seeds 

 destitute of it ; heterosporan'gic 

 ( -f Sporange), male and female 

 gametes produced by different 

 sporangia (Blakeslee) ; Het'erospore 

 ( 4- Shore), a spore containing male 

 and female energids in variable pro- 

 portion, mixed but not fused (Dan- 

 geard) ; heterospor'ic ( + Si-oka), 

 producing spores giving rise to male 

 and female gametophytes ; heteros'- 

 porous {ffTTopa, seed), with spores of 

 two kinds, as in S<iaginella ; Het- 

 eros'pory, the condition of produc- 

 ing microspores and macrospores, 

 etc. ; Heterostamino'dy ( + Stam- 

 inody), the change of a stamen of 

 one type, into that of another 

 (Worsdell) ; het'erostyled, hetero- 

 stylous ( -f Stylus) = hrtero- 

 GAMOUS ; Heterosty'lia, heteroga- 

 mous plants ; Heterosty'lism, having 

 flowers differing in the styles, as 

 Compositae when certain florets are 

 unisexual and others hermaphrodite 

 in the same head ; Heterostyly = 

 Heterogamy ; heterosymbiont'ic 

 { + Symbiont), used of lichens 

 whose algal constituents are diverse 

 in the same example (Bitter) ; het- 

 erotac'tic (to/ctzkos, qualified to ar- 

 range), with more than one system 

 in the same inflorescence ; Hetero- 

 tax'y {rd^is, arrangement), devia- 

 tion, as the production of organs in 

 situations where under nonmal con- 

 ditions they would not be found ; 

 heterothariic {daWos, a sprout), em- 



17 



ployed by Blakeslee for dioecious, 

 in Al ucorineae ; Heterothall'ism is 

 the state ; heterotherm'ic {depfios, 

 hot), applied to porous silicious 

 soil, which absorbs and loses warmth 

 (Krasan) ; heterotop'ic {rSiros, a 

 place), used of plants found on soils 

 apparently very diverse from their 

 normal stations ; Heterotristyly, 

 trimorphism, as in Lythrum Sali- 

 caria, Linn. ; heterot'ropal, hetero- 

 t'ropoas {tpSttos, direction, (1) in 

 ovules, the same as amphitropous ; 

 (2) employed by Agardh for col- 

 lateral ovules, back to back ; (3) 

 lying parallel with the hilum ; Het'- 

 erotroph {rpof^, food), (1) employed 

 by Pfeffer to denote a pure sapro- 

 phyte ; (2) an organ which is de- 

 veloped more on one side than 

 another (Wiesner) ; adj. heterotro- 

 phic, -us; Heterot'rophy, (1) used 

 by Minks for those Lichens living 

 symbiotically ; (2) by Wiesner for 

 the compound position of a shoot 

 with regard to the horizon and of 

 the mother-shoot; (3) also apj)lied 

 to nutrition by ingestion, like an 

 animal (Keeble); Het'erotype (tu-jtos, 

 form, type), Flemming's term for a 

 peculiar nuclear division connected 

 with the reduction of the chromo- 

 somes, marked by the early fission 

 of the chromatic thread, a special 

 form of the chromosomes themselves 

 (Farmer); adj. heterotyp'ic, which 

 is also employed to denote vegeta- 

 tive division ; heterotyp'ical, de- 

 scribed from more than one species, 

 these diff"ering in structure (Schu- 

 chert) ■; heterox'enous Uevos, a host) 

 = HKTEROEcious ; Hcterozygos'lty, 

 having heterozygotes ; Heterozy'- 



fote ( -1- Zygote), a " zygote formed 

 y a pair of opposite allelomorphic 

 gametes " (Bateson). 

 Hexacoc'cus m, six ; kSkkos, a kernel), 

 a fruit of six cells, as in IWiglochin : 

 hexacot'ylous, having apparently 

 six cotyledons due to fission of the 

 normal two (de Vries) ; hexacy'dic 

 {kvkKos, a circle), arranged in six 

 whorls ; Hexagoniench'yma {ywvia, 



