Archesporinm 



Arenarion 



the spores are ultimately derived as 

 in the pollen-sac, or its homologue ; 

 archespor'ial, belonging to the same ; 

 ~ Cells, the original cells in spore- 

 formation : -- Pad, Bower's term for a 

 mass of cells developing beneath the 

 sporogenous tissue in certain Pteri- 

 dophytes; Arch'etype {tvvos, a type), 

 an original simple type ; restricted 

 to a series of forms from the simplest 

 to complicated, with common type 

 of structure and phylogenetic con- 

 nections. 



ArcManth'emum (opx'> prefix for chief 

 or primitive ; &vdefiov, a flower), 

 C. Schimper's term for a well- 

 developed flower at the apex of a 

 botryoid inflorescence, where it is 

 normally absent (Penzig). 



Arch'icarp {apxh, beginning ; Kapvhs, 

 fruit), in ascomycetous Fungi, the be- 

 ginning of a fructification, the cell or 

 group of cells fertilized by a sexual 

 act ; ArchioMamyd'eae (x^afivs, 

 -vSos, a mantle), Engler's term to 

 include the Polypetalae and Incom- 

 pletae of Phanerogams ; Age of '^ , 

 the Middle Tertiary Period is so 

 termed by MaoMillan ; Archiclei- 

 stog'amy (+ Cleibtogamy), the 

 condition of permanently closed 

 flowers, whose organs are consider- 

 ably smaller than those of normal 

 ilowers (Loew) ; archigon'ic {y6vos, 

 oflsprin^;), arising by spontaneous 

 generation (Haeckel) ; Archigynmo- 

 sper'mae ( -f OYMNOsrERM), Jefl"rey's 

 term for the ferns and the lower 

 Gymnospeims ; Archimyce'tes 



(nvK-ns, a mushroom), imicellular 

 Fungi, parasitic on Diatoms (Marp- 

 niann). 



arch'ing, curved like a bow. 



Arch'isperm {apx^, beginning ; atttpya, 

 seed), (1) another name for Gymno- 

 sperms, from their presumed an- 

 tiquity ; (2) Boulger's tenn for 

 structures formed before fertiliza- 

 tion, or at an early stage in the 

 macrospore ; Arch'isphere {a^paipa, 

 a sphere), the contents of an arche- 

 gonium previous to fertilization. 



Archistrep'tes {i-pXh chief; erparrhs 



twisted), the principal spirals fonned 

 in phyllotaxis. 



Archocleifltog'amy {itpx^s, chief; -f 

 Cleistogamy), when the flowers 

 remain closed at the time when the 

 sexual organs ripen (Knuth) ; cf. 

 Archicleistogamy ; Aroh'oplasm 

 (irXic/ia, moulded), Boveri's term for 

 KiNOPLASM ; adj. archoplai'mio ; -^ 

 Sphere = Achuomatic Spindle. 



arct'ic, a term applied by H. C. 

 Watson to a British region, compris- 

 ing three zones, styled super-, mid-, 

 and infer-arctio zones, relating to 

 plants growing above the limits of 

 cultivation. 



arctogae'al {yata, the earth), in plant- 

 distribution refers to Huxley's 

 term Arcto^ae'a, which incluaes 

 Europe, Asia, Africa, and North 

 America as far as Mexico. 



arc'uate, arnia^tus (Lat. ), bent like a 

 bow, curved ; arcua'to-areola'toB, 

 divided into spaces by curves ; <-' 

 -contort'uB, forming a depressed 

 spiral, as in some legumes. 



Ardell'a (ip5», I sprinkle), small apo- 

 thecia of certain lichens, as Anhonia, 

 seemingly dusty ; Ardi'am or Ardi'on 

 (ip5a», I irrigate), a formation of 

 plants due to irrigation (Clements). 



ardos'iacos (Mod. Lat., from Fr. 

 ardoise, slate), slate-grey ; arde'sia- 

 CU8, slate-coloured (Clements). 



-are, suflix denoting a community 

 (Clements). 



A'rea (Lat., a space), (1) a bed in 

 botanic gardens ; (2) in Diatoms, 

 the surface of a valve when circular 

 and destitute of a stauros ; (3) J the 

 receptacle of certain Fungi (Lind- 

 ley) ; (4) A. Braun's term for the 

 space round the sporangium in 

 hoeits ; r of Infec'tion, the part 

 open to attack, as the stomata, 

 epidermis or wound. 



arena'ceouB, arena'rious, arcna'rius, 

 arevo'siib {arena, sand), growing in 

 sandy places. 



Arenariet'um, a formation in which 

 Arcnaria is dominant or exclusive 

 (Clements) ; Arena'rion, a family 

 of Arenaria (Clements). 



33 



