PeristaohyTun 



perpelio 



Angiosperms (Fitting) ; Peristach'- 

 yum { {ffrdxvs, a spike), the glume of 

 grasses ; Peristamin'ia (+ Stamen), 

 Periste'mones {<rT(iixuv, a filament), 

 p]. , applied to petalous dicotyledons 

 with perigynous stamens ; Per'istem 

 (abbrev, from Perimeristem), young 

 cortex in a nascent condition ; Per'- 

 istome, Perist'oma, Peristom'iwm 

 {<TT6/j.a, a mouth), the fringe or its 

 homologue round the orifice of a 

 Moss-capsule ; perist'omate, peristo- 

 ma'tiis, perist'otnus, provided with 

 a peristome ; peristomat'ic, peristo- 

 mat'icuSy when p.erigynous stamens 

 are attached round the mouth of 

 the calyx tube; peristy'licua (+ 

 Stylus), when epigynous stamens 

 are inserted between the styles and 

 limb of the calyx ; Perisy'phe, more 

 correctly Periscyphe; Perithairium 

 {QaWhs, a twig), the upper layer of 

 calcareous Algae (Rothpletz) ; Per'i- 

 thece = Perithe'cium, pi. Perithe'- 

 cia {BiiK-ri, a case), (1) a case with a 

 small opening containing asci, in 

 Lichens; (2) ^n Fungi, a receptacle 

 enclosing spores which are naked or 

 in asci; perithe'cioid {^Ihoi, like) 

 Olands, those on the pitcher of Ne- 

 pent?ies, resembling the perithecium 

 of a SphcLeria (Macfarlane) ; peri- 

 t'riohous {Opi^, Tpixos, a hair), the 

 whole surface beset with cilia (Jones) ; 

 perit'ropal, perit'ropoas, -pits (rpofl-i), 

 a turning), used of a seed which is 

 horizontal in the pericarp, or of a 

 radicle which is directed to the side 

 of a pericarp ; perixylemat'io (-f 

 Xylem), said of concentric bundles 

 m the roots of Aconcs, Jtincaceae 

 and Cyperaceae (Laux); perixy'lio, 

 Van Tieghem's expression for me3- 

 ARCH + exarch; Perizo'nium (C^^vn, 

 a belt), the thin non-silicious mem- 

 brane of a young auxospore. 

 perlar'iuB, perla'tus (Late Lat., perla, 

 a pearl), (1) shining with a pearly 

 lustre ; (2) furnished with rounded 

 tubercular appendages (J. S. Hen- 

 slow). Note : not to be confounded 

 with perlcUus, carried through, de- 

 rived from per/ero. 



276. 



perla'tent {perlntens, enduring), ap- 

 plied by De Vrios to a permanently 

 fixed character. 



per'manent, per'manens {permaneo, I 

 persist), persistent; — Quad'rat, a 

 square of one metre each way, so 

 marked as to permit of study from 

 year to year (Clements) ; ^ Tis'sne, 

 fully formed tissue, as distinct from 

 merismatic or generative tissue. 



Permeability {permeabilis, that can 

 be passed through), applied to 

 protoplasm, etc., and further dis- 

 tinguished as extrameability, and 

 intrameability, the power of 

 allowing the passage of certain sub- 

 stances out of or into its vacuoles 

 respectively (Janse). 



permo'bile {per = very ; mobilis, easy 

 to be moved), very easily moved, 6is 

 many sand dunes. 



Permuta'tion, PermtUa'tio (Lat., a 

 changing), enlargement of the floral 

 envelopes with abortion of the sexual 

 organs (Penzig). 



permuta'tus (Lat.), completely 

 changed. 



Ferniclasm {pemicies, destruction), 

 Tubeufs term for the killing of host- 

 cells by a parasitic fungus. 



Per'nio (Lat,, a chilblain), a local 

 affection resembling an ulcer, 

 caused by cold. 



Perocid'ium J (ir«pi, about ; iyKihov^ 

 a tubercle), Necker's term for Peri- 

 chaetium. 



personate, perona'tus (Lat., leather 

 booted), thickly covered with a 

 woolly covering becoming mealy. 



peronooar'pio, where occurring, pro- 

 bably a misprint for pyrenocarpic. 



Perovula'tae (per, much or very; 

 ovulatus, ovuled), otherwise Semi- 

 natae, Van Tieghem's terms for 

 phanerogams furnished with true 

 seeds. 



Perox'ydase (per, very + Oxydase), 

 an enzyme causing increased evolu- 

 tion of oxygen. 



perpelio {per, much; inj\br, claj), • 

 Thurraann's term for rocks which 

 yield clay, pure and abundant, also 

 for the plants which thrive thereon. 



