Polysaocharid 



prognathoas 



Polysac'charid {aaKxap, sugar) = 

 Callus (Church) ; polyso'ma {aojfj.a, 

 a body) = polyploid ; polysapro'bic 

 {(ja-rrpos, rotten), putrid material 

 abundant (Lauterborn) ; Poly- 

 stelo = PoLYSTELY ; Polythal'lca 

 (4-Thallus), a thallus of several 

 merids (Janet) ; polythal'mic, a 

 misprint for polythalam'ic ; Poly- 

 top'ism, the condition of being 

 poLYTOP'ic, of multiple origin ; 

 PoLYGENESis is a synonym 

 (Clements). 



pomolog'ic, relating to Pomology; 

 Pomorogist, a student of fruit 

 culture. 



Pontederie'tum, an association of 

 Fontederia Linn. 



pontohalic'clous (oA?, dAo'5, the sea), 

 inhabiting a salt-marsh. 



por'al, relating to a Pore ; ~ Ax'is, 

 the long axis ; --^ Ring, four to 

 six epidermal cells surrounding 

 the pore in fossil species of Sequoia 

 Endl. (Bandulska) ; Pore, add, (6) 

 minute canals in certain diatom- 

 valves, which pass through the 

 cell-wall (West); - Flagel'lar, cj. 

 Flagellar Pore ; ~ Or'gans, part 

 of cell-wall in dcsmids, each pore 

 being surrounded by a cylindrical 

 tube-like structure, but not of 

 cellulose (West) ; Sphagnum ~ ; 

 cf. Sphagnum Pores ; Pore'cork 

 [dissyll.], strips of a fcAV layers of 

 compact brownish cells in lenticels ; 

 Por'oids, minute circular dots in 

 diatoms, more than 0'6/i in dia- 

 meter, tiny cavities resembling 

 pores, but not actual perforations 

 (O. Muller). 



postcing'olar ( + Cingulum), plates in 

 the hypovalve of Peridiniae, behind 

 the girdle, fewer, and sometimes 

 larger, than the precingular plates 

 (West); Postcli'max (+ Climax), 

 when change of climate increases 

 the water-content, and vegetation 

 alters thereby ; the parsing of a 

 climax ; cf. Preclimax (Clements) ; 

 Postcli'sere ( -j- Clisere), proceeds 

 from lower to higher climaxes, 

 succeeding a cliscrc [id.); post- 



synapt'ic ( + Synapsis), after synap- 

 sis ; Fostsynezis, following that 

 stage (Gates) ; post-synize'tic, after 

 synizesis. 



potamic'olous, river- dwelling. 



Potentiometer {potentia power -\- 

 Meter), an instrument to deter- 

 mine the hydrogen-ion concentra- 

 tion in soils. 



Prair'ies, grass-steppes in North 

 America. 



precing'ular (+ Cingulum), applied 

 to a plate in the epivalve of Peri- 

 diniae, behind the apical plates 

 and usually larger (West). 



Precli'max (+ Climax), the vegeta- 

 tion preceding the full development 

 of a climax (Clements) ; Precli'sere 

 (-f Clisere), one which proceeds 

 from higher to lower climaxes, pre- 

 ceding a clisere {id.); Pregameto- 

 spore, an early stage of Volvox 

 (Janet). 



Presenta'tion, cf. Pollen-presenta- 

 tion. 



presynapt'ic (+ Synapsis), previous 

 to synapsis ; pre-ssmize'tic, pre- 

 ceding synizesis. 



Prim'itive Spin'dle, an embryo with 

 polarity (Bower). 



Primor'dia, add, analogous to Men- 

 delian unit characters (MacLeod) ; 

 Pri'sere (+ Sere), primary sere 

 (Clements). 



Proang'iosperms, fossil plants in 

 structure approaching the present 

 Angiosperms (Saporta) ; Prochon'- 

 driomes ( + Chondriome), chromatic 

 granules more or less globular, 

 probably derived from the nucleo- 

 lus ; Prochro'matin, add, (2) chro- 

 matic substance in diffused and 

 modified condition (Latter); Pro- 

 cormophy'ta (+ Cormophyte), the 

 flora of the Devonian period (Arber). 



Pro'flles (Ttal. proflo, shape), dia- 

 grammatic records of the vertical 

 relation of the local vegetation 

 (Tansley and Chipp). 



Progen'ies (Lat. descent), special 

 progeny for genetic investigation. 



progna'thous (yvdOos, the jaw), when 

 anthers project forward at the base. 



460 



