propendent 



Prosper y 



propen'dent, propen'dois (Lat.), rang- 

 ing down. 



prop'er, true, or correctly understood ; 

 -^ Juice, any characteristic " Huid " 

 of a plant, as the "milk " of lettuce, 

 etc. ; -^ Valves = Spathe-valves. 



Properimer'istem {pro, for, + Peri- 

 meristem), a synonym of Peri- 



MERISTEM. 



Proph'asis, pL Prophases {irph, before ; 

 (pdais, an appearance), the changes 

 in the mother- nucleus previous to 

 division, including the formation of 

 the nuclear plate and the longi- 

 tudinal division of the chromosomes ; 

 Prophlo'em (+ Phloem), (1) Proto- 

 I'HLOEM ; (2) the cylinder of elon- 

 gated cells with thickened walls, 

 occurring in the seta of some Mosses 

 round the protoxylem ; prophoto- 

 tac'tic {TUKTiKhs, arranging), turning 

 towards light (Macdougal) ; the 

 condition itself is Prophototax'is ; 

 Prophotot'ropism (rpoTr^, turning), 

 moving towards the centre of the 

 radiating light (Macdougal) ; Pro'- 

 phyll, bracteole, c/. Puuphyllum ; 

 Pro'phyllum {(pvWoi', a leaf), the 

 bracteole at the base of an individual 

 flower, in German " Yorblatt " ; 

 prophyila'tus, provided with pro- 

 phylla ; prophyrioid (elSos, resem- 

 blance), like projihylla. 



Proph'ysis = PKosrnvsis. 



Prophy'togams (7rpi», before ; (pvrhv, a 

 plant ; yd/j.os, marriage), Focke's 

 proposed name for vascular Cryp- 

 togams. 



prop'rius (Lat, special, peculiar), 

 partial. 



pros- {TTphs, towards), em})loyed to de- 

 note positive phenomena by Rothert, 

 as in the four following terms : — 

 Prosaerotax'ffl (+ Aeuotaxi.s), the 

 stimulus of oxygen on the move- 

 ment of zoospores and other mo- 

 tile organisms ; p" ischairlimnet'ic 

 ixalpw, I rejoice ; ^I/ju'V, a 1'0<j1)> 

 occasionally belonging to Limno- 

 plankton (Forel) ; Proschemotax'is 

 -f Chemotaxis), attraction by cer- 

 tain substances, shown ))y bacteria, 

 antherozoids, etc. ; adj. proschemo- 



tac'tic ; Proscoria t (koWo, glue), 

 a viscid gland on the up])er side of 

 the stigma of Orchids, to which 

 the pollen-masses become attached, 

 the Retinaculum ; Prosem'bryum 

 {i/x&pvov, an embryo), = Peri- 

 SPERMIUM ; Prosench'yma (eyxi^Mo. 

 an infusion), tissue of lengthened 

 cells with tapering ends which over- 

 lap ; adj. prosenchy'matous ; Pros- 

 enth'esis {(vO^cns, a ])uttiug in), 

 when whorled flowers have a gap 

 between two successive whorls ; 

 generally the divergence of this gap 

 is greater than tliat of the whorl ; 

 if less, it is negative Pkosenthesls 

 (Eichler) ; Prosgalvanotax'is = 

 Galvanotaxis ; prosgeotrop'ic (-f 

 GEOTROPic), the positive influence of 

 gravity on organs during growth ; 

 the condition is Prosgeot'ropism ; 

 prosheliotroplc (+ heliotropic), 

 turning towards the source of light ; 

 the state is Prosheliot'ropism; Pros- 

 hydrotax'is (+ Hyduotaxis), nega- 

 tive osmotaxis ; Pros'oplasm (-n-Aao-^a, 

 moulded), used of pathologic tis- 

 sues caused by parasites as in galls 

 (Trotter) ; adj. prosoplast'ic ; Pros'o- 

 plasy = Hypertrophy ; Prososmo- 

 tax'is (-f OsMOTAXLs), movement of 

 motile organisms in consequence of 

 the influence of fluids ; Prosphoto- 

 tax'is ( 4- Phototaxis), definite 

 arrangement as the result of the 

 action of light on organisms capable 

 of response ; Pro.s'physes {^pvais, 

 growth), "abortive pistillidia of 

 the muscal alliance" (Lindley) ; 

 Prosoplectench^yma ( + Plecten- 

 chyma), a modification of hyphal 

 tissue (Lindau). 



Prosporan'gium (7rpi>, for ; airopa, a 

 seed ; 0776101', a vessel), (1) in Chy- 

 tridieae, etc., a vesicular cell whose 

 protoplasm jtasses into an outgrowth 

 of itself, the sporangium, and then 

 divides into swarm-sporcs ; (2) in 

 PhacoHi)oreae, an early fornud 

 sporangium, formed of a layer of the 

 filament combined with an out- 

 growth (Kuckuck). 



Pros'pory [irpwios, ]»recocious ; cnropa, 



305 



