Exothiobacteriaceae 



Fragmentatioo 



bacter'iaceae, c/. Ectothiobacteei- 

 ACEAE ; Expansiv'ity, diruption, di- 

 vulsion (St. Pierre) ; Exten'sion, 

 final lengthening of the filament 

 of the stamen-filaments due to 

 water-pressure (Thompson) ; Exu- 

 da'ses, any exudations from tissues 

 (Priestley). 



Fi, F2, (1) hybrids of the first or 

 second generation ; (2) Chauvaud's 

 terms for successive leaf-like organs. 

 Fo, pure parental type (Engledow). 

 Fac'tors, pi. elements which con- 

 tribute to produce a result ; they 

 may be divided thus : — biot'ic '-', 

 vital functions ; climat'ic ~, 

 depending on the temperatures ; 

 edaph'ic ~, depending on the 

 character of the soil; geodynam'ic 

 ~, the latent forces of the earth ; 

 le'thal ^j fatal or at least injurious ; 

 physiograph'ic ~, the earth's com- 

 bined forces. 

 Fam'ile, for Family (Clements). 

 Fat'uoid, a mutation from Avena 

 sativa Linn., resembling A. fatioa 

 Linn. (Huskins). 

 fauc'ial {fauces, the throat), situated 

 in the throat or mouth of the 

 perianth (Herbert). 

 Fell-fleld, (1) Al'pine ~, in the Euro- 

 pean mountains ; (2) Arc'tic '^, 

 round the North Pole. 

 Fertiliza'tion, Breech (Jeffrey), = 



Chalazogamy. 

 Fibonac'ci An'gle = 137-5^ (Church). 

 Fi'bres, Cen'tral, cf. Central Fibres ; 

 Fibro'sis, exaggerated development 

 of the fibrous strands in Iris 

 Tourn. (Arber). 

 Fidel'ity, cf. Exclusiveness. 

 Firament, add, (3) an entire univalent 

 spireme (Digby); cf. Disc-fila- 

 ments. 

 Fis'sion, add, (2) longitudinal separa- 

 tion, (1) of the entire univalent 

 spireme into two threads, and (2) 

 that of a univalent chromosome into 

 two daughter-chromosomes (Digby). 

 Fis'tula, add, (2) medul'lary ~, the 

 central cavity in the stem of 

 Equisetum Linu. (Jeffrey). 



Fix'ity, the condition of little or 



no response to stimuU (Clements). 

 Flagel'Iar Pore, an aperture in the 

 cell-wall of Peridiniae, through 

 which the two flagella pass as they 

 leave the protoplast (West) ; 

 Flageriidae, flagellates in the strict 

 sense (Calkins) ; Flagel'lispore or 

 Flagel'lula, a swarm-spore pro- 

 vided with one or more flagella 

 (Minchin) ; Flagello'sis, an invasion 

 by flagellate organisms causing 

 disease; Flagel'lulae, cf. Flagel- 

 lates (Church). 



Flap, an old term for the pileus of an 

 agaric ; Flaps, see Connective 

 Flaps. 



Flask-cell, the stalk-cell of the 

 antheridium in Characeae. 



Floccola'tion {floccus, a flock of wool), 

 the aggregation of precipitated 

 particles into large soft masses 

 remaining suspended in the medium 

 (Addams). 



florist'ic, relating either to (1) flowers 

 or floral emblems, or (2) local 

 botany; cf. ~ Geobotany, ~ 

 Phytosociolggy ; Flos ^, Parla- 

 tore's term for anther in Coni- 

 ferae. 



Fluctua'tion (fluctus, a wave), change 

 due to direct effect of the en- 

 vironment during lifetime ; opposed 

 to Mutation, due to the presence 

 of specific factors in the organism 

 (Punnett). 



Fo'liar Base, Bower's term in place 

 of Eichler's " Blattgrund " ; - 

 Ray, see Ray, Foliar. 



Fo'lioid, a hypothetical conception 

 of a leaf -like organ. 



Forb ((f>opp-q, fodder), herb (Clements). 



Fore'dune [dissyll.], the surface of a 

 dune exposed to the prevalent wind 

 (Cockayne). 



Fos'sula, add, (2) a space between 

 the ridges of an oospore of Charade ; 

 sulcus. 



fragarif orm'is {fraga, strawberries ; 

 forma, shape), a fruit shaped like 

 a strawberry. 



Frag'ment, portion of a chromosome ; 

 Fragmenta'tion, add, (2) the con- 



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