aqueous 



Archesporium 



of thin-walled parench3Tnatous cells, 

 destitute of chloroplastids, with much 

 watery sap, without interspaces, and 

 acting as water-reservoirs ; aquifer- 

 ous ifero^ I bear) Tissue, is a synonym. 



Aquilo'nary Pe'riod {aquilonaris, 

 northern) = Xekothekm. 



Aquipra'ta (aqua water ; pratum, a 

 meadow), pi. plant-communities and 

 lierbs, grasses, and bryophytes, where 

 influenced by ground-water. 



Ar'abin, a substance derived from Gum 

 Arabic, deflecting the polarized beam 

 to the left ; Ar'abinose, a glucose 

 obtained from it, also from cherry- 

 gum; Arabinoz'ylan.a hemicellulose, 

 found in the bran of wheat and rye. 



ara'ceous, relating to the order 

 Araceae. 



aracb'noid, arach'noideus [kpixvn, 

 spider, or spider's web ; eZSos, re- 

 semblance), like a cobweb, from an 

 entanglement of line whitish hairs. 



aralia'ceous, resembling the genus 

 Aralia, or the order of which it is 

 the type. 



ara'neous |, araneo's^is $, ara'neose 

 {a7-anta, a spider), have the same 

 meaning as arachnoid. 



Araro'ba, a powdery excretion in cavi- 

 ties of the Brazilian tree, Andira 

 Araroba, Aguiar, 



Ar'bor (Lat., tree), a woody perennial 

 plant, having a bole from which 

 the branches spring ; arbor'eous, 

 arbor' ens, tree -like ; arbores'cent, 

 arborca'cens (-{- escens), attaining 

 the size or character of a tree ; 

 Ar'boret, a small tree or shrub ; 

 Arbore'tum, a place assigned foi* 

 the culture of trees, usually in 

 systematic order ; also the title of 

 a book devoted to trees ; arboric'ol- 

 ine, arboric'olous (-f suffix -cola, 

 inhabitant), dwelling on trees, as 

 the habitat of Fungi or epiphytes ; 

 ar'boroid (elSoj, resemblance), a 

 hybrid word for dendroid, tiee- 

 like. 



Arbus'cula (Lat.), a small shrub with 

 the aspect of a tree, as some heaths ; 

 Ar'busole is an old term for the 

 same ; Arbus'culus (Lat.), a small 



tree ; arbus'cular, arbiiscula'ris, 

 shrubby, and branched like a tree. 



arbus'tivfc, arbiisii'vus (Lat., planted 

 with trees), coppiced. 



Arbus'tum (Lat), (1) a shnib, a 

 branched woody perennial plant, but 

 wanting a distinct bole ; (2) applied 

 to an account of the woody plants of 

 a country ; a Sylva. 



Ar'butiu, a glucoside occurring in many 

 plants, especially Ericaceae; it de- 

 rives its name from Arbutus. 



Arces'thide, Arces'thida {apKtvBXs, ISos^ 

 juniper berry) = Galbulus. 



Archae'ophytes {<f>vrdv, a plant), Rikli's 

 term for weeds introduced into culti- 

 vated ground in prehistoric time. 



archa'ic {apxaiKhs, antiquated), used 

 with reference to a type of a former 

 age, as Casuarina. 



Archebio'sis {apxh, beginning ; $lo5, 

 life), origin of life ; Arch'egone = 

 Akchkgonium ; archego'nial iyovi], 

 race),a{>plied by Tschirch to stomata, 

 whose outer walls of the guard cells 

 are thickened, inner walls only a thin 

 lamella, the guard cells separated in 

 their central part but not at the 

 poles, as in Gymnosperms ; archego'- 

 niate, possessing archegouia ; Arche- 

 gonia'tae, plants j)rodacing arclie- 

 gonia, applied to Hryophytes and 

 Pteridophytes ; Archego^niophores 

 {<popfu, I bear), the supports of 

 archegonia in certain ferns, oiit- 

 growtlis of the prothalli, also, 

 specialized branches on Sphagnum 

 with the same function ; Archego'- 

 nium, the female sexual organ in 

 CryptogamSjContaiuing the oosphere, 

 which after fertilization develops 

 within the venter ; Archene'ma 

 (j/^ytio, a thread), term proposed by 

 C. MacMillan for gametophy tic struc- 

 tures in Thallophytes ; Arch'esperm 

 {avepfia, a seed), (1) the fertilized 

 contents of an archegonium (Bennett 

 and Murray) ; (2) also employed by 

 MacMillan, for jilants with obliga- 

 tory and archesper'mic seeds, with 

 monomorphous embryos ; Arch'- 

 espore, Archespor'ium {(riropa, a 

 seed), the cell or cells from which 



32 



