PMlotherm 



Fhotokinesis 



plants which need warmth to 

 complete their life-cycle. 



phleboi'dal {<p\i\^, (p\efih5, a vein), 

 has been applied to spiral annu- 

 lar, or porous moniliform vessels 

 (Cooke) ; Phlebomor'pha {fiop<p^, 

 form), the mycelium of some 

 Fungi. 



Phleume'tum, a plant-association 

 consisting of Phleum pratense, etc. 

 (Ganong). 



Phlobaph'enes, pi. {(pXoths, bark ; 

 fiacp^, a dyeing), amorphous brown 

 colouring-matters of the bark ; 

 phloeo'des (eUos, resemblance), ■ 

 bark-like in appearance ; Phlo'em, 

 Naegeli's term for the bast elements 

 of a vascular bundle ; it is separated 

 in exogens from the wood (xylem) 

 by the cambium ; '^ Com'missure, 

 the apposition of phloem elements 

 as the beginning of a central strand 

 (Brebner) ; r^ I'slands, groups of 

 bast-strands surrounded by xylera 

 (Chodat) ; '^ -parencli'yma, cf. 

 Bast-parenchyma ; ^ Ray, a ray 

 or plate of phloem between two 

 medullary rays ; -^ Sheath, a layer 

 of thin-walled cells surrounding the 

 vascular tissue next within the 

 cortex, best seen in roots ; Phloe- 

 oter'ma {r4p/xa, a limit), the inner- 

 most layer of primary cortex ; 

 Phloeotrach'eides ( -f Traciieid), 

 the vascular elements of the haus- 

 torium of parasitic Santalaceae 

 (Benson) ; Phloe'umJ, the cortical 

 tissues; Phlorid'zin {l>lCa, a root), 

 a white crystalline substance which 

 gives the bitter astringency to the 

 root-bark of the apple, pear, cherry, 

 and ])lum-trees ; Phloroglu 'cin, a 

 body of frequent occurrence in the 

 bark of trees, derived from glucosides. 



Phlyktioplank'ton ((t>\vKTls, a blis- 

 ter, + Plankton), Forel's term for 

 organisms supported by hydrostatic 

 means. 



pho''bic {(t>6^os, fear), repulsive ; Pho'b- 

 iem, Massart's term for repulsion of 

 plants ; phobochemotac'tic (chem -f-. 

 rd^is, arrangement), a chemical in- 

 fluence which is repellent, as in 



swarm spores of -Myxomycetes ; 

 Phobochemotax'is, the condition de- 

 scribed ; Phobophotax'is ; Phobo- 

 photot'ropism {<pus, (pwrhs, light ; 

 rpoTT^], a turning)', movements in- 

 duced by shunning light ; adj. 

 phobopbotac'tic. 



phoenic'eous, phoenic'eus (Late Lat.), 

 scarlet ; red with a little of yellow 

 added. 



phoeoB'porous = phaeosporous. 



Pho'ma- stage, the perithecial stage of 

 Beetroot Rot, Phoma Betae ; the 

 ascigcrous stage is that caused by 

 Sphaerella. • 



Pboran'tbiam {fophs, bearing; Hydos, 

 a flower), the receptacle of the capi- 

 tulum in Compositae. 



photeoric {<pws, <pu>Ths, light ; al6Aos, 

 moving, motile), used of the sleep cf 

 plants ; pho'tic, influenced by, or 

 adapted tp, the action of light, well- 

 illuminated, as the margins of pools, 

 etc. ; Pho'tism, Massart's term for 

 the emission of light under stimulus ; 

 Photo-aestbe'sia {&L<rd7)aris, percep- 

 tion), Csapek's term to express the 

 power of an organ to respond to the 

 stimulus of light ; Pboto'bia (filos, 

 life), pi., Tulasne's term for ecto- 

 parasitic Fungi ; Pho'toblast {^Kaa- 

 rhs, a bud), used of a shoot deve- 

 loped above the soil, and adapted to 

 live in light and air (Kiichner) ; 

 photocleistogam'ic ( -\- cleisto- 

 GAMic), used of flowers which do 

 not open in consequence of the rapid 

 growth of the outer side of the 

 petals, due to photohyponasty 

 (Hansgirg) ; Pbotocleistog'amy is 

 the condition ; Photocli'ny {k\Iv<o, 

 I bend), response due to the direc- 

 tion of the incident rays ; Photo - 

 epinas'ty ( -|- Epinasty), epinasty 

 induced by the action of light 

 (Detraer) ; photogen'ic. {-yff-, pro- 

 ducing), used of bacteria which are 

 luminous ; Photohar'mose {ap/xhs, a 

 joining), response to light stimuli 

 (Clements) ; Photobyponas'ty ( + 

 Hyponasty), hyponasty caused by 

 the effect of light (Vines); Pboto- 

 kine'sis ( + Kinesis), movement 



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