prolifio 



psendoconohoid 



proli'iic. Cells, applied to disjointed 

 cells of the thallus of PiOtophora 

 Wittr., serving for vegetative 

 propagation (Wittrock) ; Promer'- 

 istem (4- Meristem), in seedlings, 

 the apex of the stem of undifferen- 

 tiated parenchymatous cells in 

 active division in all directions 

 (Randolph); adj. promeristemat'ic ; 

 Promito'sis (-[- Mitosis), a simple 

 form of nuclear division, seen in 

 nuclei of the protokaryon type 

 (Nagler). 



Propag'ule {propago, a slip or shoot), 

 a bud, gemmule or bulb capable of 

 continuing its kind. 



propha'sic, adj. of Propkasis. 



Prophylax'is (77-po^uAa/cTt/<d?, precau- 

 tionary), prevention of disease, 

 adj. prophylac'tic. 



Proplast'id {TrXaoToSy formed), (1) 

 Janet's term for mother-cell of 

 Ontoplastid; (2) a minute granule 

 in cytoplasm, definitely concerned 

 with the formation of chloroplasts 

 (Randolph); Propteridophy'ta, pi. 

 (4- Pteridophyte), Arber's term 

 for Procormophyta. 



Pro'soplasy (Trpo?, in addition ; irXdaaoj, 

 I mould), new histological char- 

 acteristics and functional activities 

 associated with hyperplasia; adj. 

 prosoplast'ic ; Pro'soplasm, the 

 state in question. 



Prosor'us ( 4- Sorus), body developed 

 from a zoospore in a cell of Syn- 

 chitrium De Bary, into nucleus, 

 cytoplasm and outer membrane 

 (K. M. Curtis); adj. prosor'al. 



Prosperity, the extent a species com- 

 pletes its cycle of development in 

 a given population. 



Pro'tase, hypothetical first enzyme of 

 archebiotic process (Troland). 



proteochemotroplc (c/. Chemotrop- 

 ISM), applied to pollen-tubes 

 attracted by protease, cf. saccharo- 

 cHEMOTROPic ; Pro'teosere (-(-Sere), 

 cf. Thallosere ; Protobasidiomy- 

 ce'tes (+ Basidiomycetes), with 

 septate basidia, four basidio- 

 spores on each, such as Uredinales 

 and Tremellales ; Protoben'thon 



(4- Benthon), not defined by the 

 author, but probably the earliest 

 bottom vegetation (Church) ; Proto- 

 bi'ont ( 4- Biont), a primitive being ; 

 a protophyte (Janet) ; Protobot'anist 

 (4- Botanist), Greene's term for 

 Theophrastus Eresios (B.C. 372?— 

 287). 

 protococca'ceous, belonging to Pro- 



tococcus Ag. 

 Protodoch'ae {hoxr}, reception), cj. 

 Priseres ; Protokar'yon (/capuoi/, a 

 nut), a simple nucleus of chromatin, 

 suspended in the nuclear sap (Min- 

 chin) ; proteroclad'ous (kAciSos, a 

 branch), disposed to a rudimentary 

 branch division (Janet) ; Protoderm'- 

 a-state, a culture state of Protococcus 

 Ag. resembling Protoderma Kiitz.; 

 protomorph'ic {fjLop(f>i^, shape), 

 Mastcrs's term for primordial leaves ; 

 Proton'ta {ovra, things existing), 

 ultra- microscopic organisms, differ- 

 ing fundamentally from bacteria 

 (Gates); Protoplasm, add, ac'tive 

 ~, as in male gametes, andro- 

 plasm ; pas'sive ~, as in female 

 gametes, gynopiasm (N. Jones) ; 

 Protoste'ly, cf. Protostele ; proto- 

 synthet'ic {avvdiros, compound), 

 early or simply-formed (Church) ; 

 protozo'al {^coov, an animal), related 

 to the simplest animals (K. M. 

 Smith). 

 Prune'tum, scrub formed of various 

 shrubby forms of Prunus spinosa 

 Linn. 

 Psam'march {apxn, beginning), the 

 condition of an adsere starting on 

 sand (Clements). 

 Psamme'tum, an association of 

 PtiCDHina Beauv. — Ammophila 

 Host ; on high dunes (Warming) ; 

 Psam'mophiles {(f>i.Xeoj, I love), 

 plants preferring sandy soil for 

 their growth (Druce); Psam'mosere 

 (-f Sere), a loose, sandy adsere 

 (Clements). 

 Pseudamito'sis (4- Amitosis), having 

 been forced to the simpler method 

 of nuclear division, by outward 

 circumstances (Tischler) ; pseudo- 

 con'choid (xdyx^, concha, a shell). 



461 



