pottia'ceous 



(SUPPLEMENT) 



Prosoplasm 



pottia'ceous, allied to Pottia. 



Prae'form ( + FORM), an early form, 

 the original ancestral strain 

 (Kuntze); Praenmta'tion ( + MUTA- 

 TION) ; the inner preparation of a 

 plant, for the outward manifesta- 

 tion = MUTATION (De Vries). 



Presentation Time, the period re- 

 quired for an organ to take up 

 perception (Macdougal). 



Pre-bract'eole, the sub-sporal bract 

 in Chara ; it may be restricted to 

 a single swollen cell (Allen). 



Primule'tum, Clements's term for an 

 association of Primula. 



prismatic Lay'er, Farmer's term for 

 a layer of cells in Isoetes sur- 

 rounding the xylem cylinder 

 (Campbell). 



Proces'sus, see BANDS, in fruit of 

 Zostera minor. 



Prochro'matin (+ CHROMATIN), the 

 substance of nucleoli (Pfitzner). 



Prochys'ium (irp6xvcris ) a pouring 

 out), succession of plants on allu- 

 vial soils (Clements), published as 

 "Prochrosium." 



ProcTromus (Lat., a forerunner), fre- 

 quently employed in botanic works, 

 which are intended should be 

 followed by more complete treatises. 



Progameta'tion ( + GAMETE), em- 

 ployed by Maire to denote the 

 act of synkaryons becoming pro- 

 gametes ; Progame'tophyte (<f>vr6v, 

 a plant), the plant which produces 

 progametes (Maire) ; Progemma'- 

 tion (+ GEMMATION), when stylo- 

 spores are given off from basidia, 

 new terminal cells being developed 

 from older or basal cells (Ny lander) ; 

 progeoesthet'ic (777, earth, al<r- 

 BIJTIKOS, perceptible), applied to the 

 root-tip when tending downwards ; 

 Prohydrotrop'ism ( + HYDRO - 

 TROPISM), turning towards a source 

 of moisture (Macdougal) ; adj. 

 prohydrotrop'ic ; Prokaryogam'ete 

 (Kdpvov, a nut, = nucleus, yd/u.os, 

 marriage), the nucleus of a primary 

 progamete (Maire) ; Prokarygame- 

 tisa'tion, quantitative reduction 

 (Maire). 



prolep'tic, anticipatory. 



prolific Cells, reproductive cells 

 (Wittrock) ; prolifl'ed, grown out 

 into prolification, as a tuft of 

 leaves from a cone. 



prometatrop'ic (fj^ra, from, TJOOTTTJ, 

 a turning), in crossing, when the 

 interchange is between the plants, 

 the pollen of one going to the other, 

 but the pollen not from anthers 

 associated with the ovaries ferti- 

 lized (K. Pearson) ; promyce'lial, 

 relating to a promycelium ; ^ 

 Spores, those generated in asci 

 (Cooke) ; the Sporidia of continental 

 mycologists (Plowright). 



Proodophy'tia (-n-pfodos, in advance, 

 <t>vr6i>, a plant), initial plant forma- 

 tions (Clements). 



prop'er Valves = SPATHE-VALVES. 



prophototac'tic (ra/crt:6s, arranging), 

 turning towards light (Macdougal) ; 

 the condition itself is Prophoto- 

 tax'is ; Propnototrop'ism (T/JOTTT?, 

 turning), moving towards the centre 

 of the radiating light (Macdougal) ; 

 Pro'phyll, bracteole, cf. PRO- 



PHYLLUM. 



pros- (TT/OOS, towards), employed to 

 denote positive phenomena by 

 Rothert, as in the following : 

 Prosaerotax'is ( + AEROTAXIS), the 

 stimulus of oxygen on the move- 

 ment of zoospores and other motile 

 organisms ; Proschemotax'is ( + 

 CHEMOTAXIS) attraction by cer- 

 tain substances, shown by bac- 

 teria, antherozoids, etc. ; adj. 

 proschemotac'tic ; proschairlim- 

 net'ic (xafy>w, I rejoice, \lfunj t 

 a pool), occasionally belong- 

 ing to Limnoplankton (Forel) ; 

 Prosgalvanotax'is = GALVANOTAXIS; 

 prosgeotrop ic ( + GEOTROPIC), the 

 positive influence of gravity on 

 organs during growth ; the con- 

 dition is Prosgeot'ropism ; pros- 

 heliotropic ( + HELIOTROPIC), turn- 

 ing towards the source of light ; 

 the state is Prosheliot'ropism ; 

 Proshydrotax'is ( + HYDROTAXIS), 

 negative osmotaxis ; Pro'soplasm 

 (TrXa'cTAta, moulded), used of patho- 

 350 



