Pleiotomy 



PleuiUm 



a flower ; Pleiot'omy {t6/xos, a cut), 

 multiple dichotomy or fission (Wors- 

 dell) ; Pleiotrache'ae (+ Trachea), 

 ' ' membranous tubes or tracheae con- 

 taining a compound sj»iral fibre " 

 (Cooke) ; Pleiox'eny U^vos, a host 

 or guest), where a parasite can in- 

 vade several species of host-plants 

 (De Bary). 



ple'nus (Lat.), full, as Flos plenus = a 

 double flower. 



Pleochro'ieisin [tcK^ou, more ; xp<^«> 

 colour, complexion), with various 

 colours in the cell- wall ; syn. , Pleo- 

 chro'miBDi (xp«M"' colour), adj. 

 pleochro'ic, pleochrois'tic ; Pleo- 

 g'amy {yd^io's, marriage), Loew's term 

 for methods of pollination varying 

 in respect of time, etc. ; fe^male '^ , 

 gynodioecism united with gynomo- 

 noecism ; male '^ , androdioecism 

 united with andromonoecism ; Pleo- 

 g'eny {y^vos, race), mutabilfty of 

 function; adj. pleogenet'ic ; Pleo- 

 mor'phism {iJ.op(pi], shape), muta- 

 bility of shape ; adj. pleomor'phic ; 

 Pleomor'phy, the same as Pleio- 

 MORPHisM ; adj. pleomor'phous = 



PLEIOMORPHOUS. 



Ple'on, Naegeli's term for an aggre- 

 gate of molecules, but smaller than 

 a Micella. 



Ple'onasm {vXeSi/ao-fia, a surplus), 

 redundance in any part (Crozier). 



pleoph'agous {v\eov, more; <pdyos, a 

 glutton), not restricted to one host ; 

 feeding on various species ; Pleoph'- 

 agism is the condition ; pleophylet'ic 

 {<pv\it, a tribe), descended from 

 numerous lines, polyphyletic ; ple- 

 or'ic, an error for peloric; pleo- 

 troph'ic {'rpo(()i), food), feeding on 

 various substances, not restricted to 

 one (C. Jones). 



Ple'rome {irk-fipuna, that which fills), 

 the cylinder or shaft of a growing 

 point enclosed and overarched by 

 periblem; -^ Sheath = Bundle- 

 sheath. 



plesiomor'phons (irXrjo-tos, near ; fiopcp^, 

 shape), nearly of the same form 

 (Crozier) ; Ples'iotype {rviros, a 

 type), a specimen compared with 



a species, and newly described and 

 figured. 

 Pleu'ra {irXevpa, a side or rib), the gir- 

 dle or hoop of Diatoms (0, Mueller) ; 

 Pleurenoh'yma {^yxvfM, an infu- 

 sion), woody tissue ; pleuroblas'tic 

 {^Xaarhs, a bud), (1) used of certain 

 forms of Fungi, producing lateral 

 outgrowths serving as haustoria ; (2) 

 employed by Celakovsky to denote 

 the early stages of the monocotyle- 

 donous embryo; cf. acroblastic; 

 pleurocar'pous, -pus {Kaptrhs, fruit), 

 applied to those Mosses which 

 bear their fructification on lateral 



growths, cf. ACROCARPOUS. 



pleofooocca'ceoTis, pleurococ'coid 



{eUos, resemblance), like the genus 

 Fleurococcus, or its allies. 



plenrodis'cous {vXevphy a side or rib; 

 SlffKos, a quoit), when an appendage 

 is attached to the sides of a {lisc ; 

 pleurogyn'ius, pleurogyn'us {ywij, 

 a woman), used when a glandular or 

 tubercular elevation rises close to or 

 parallel with the ovary ; pleurogy'- 

 rate, pleurogyra'tics {yvphs, round), 

 when Fern-sporangia have the annu- 

 lus horizontal ; pleuroplaa'tic {irXaff- 

 rhs, moulded), Prantl's term for a leaf 

 in which the central portion firet 

 attains permanency, the meristem 

 being marginal ; pleurorhi'zal, -zus 

 {plCa, a root), when an embryo has 

 its radicle against one edge of the 

 cotyledons, which are then accum- 

 bent; Pleur'osperms (av4p^a, a 

 seed), Angiospernis which began 

 with chalazogamy, but have be- 

 come porogamous (Nawaschin) ; 

 adj. pleurosper'mic ; Pleuroflpor- 

 ang'ium {ffiropa, a seed; ayye^ov, a 

 vessel), a sporangium which pro- 

 duces pleurospores ; Pleur'ospore, 

 a spore formed at the sides of a 

 basidium in Basidiomycetes (Van 

 Tieghem) ; pleurotri'bal, or pleur'o- 

 tribe {rpl0w, I beat), used of flowers 

 whose stamens are adapted to de- 

 posit their pollen upon the sides of 

 insect-visitors. 



Pleu'aton {rrXevariKhs, ready for sail- 

 ing), (1) plants which float by reason 



291 



