perispermie 



perpendicular 



embryo sac ; (2) the pericarp or 

 even the integuments of a seed ; 

 perisper'mic, perisper'micus, perl- 

 sperma'tus, (1) furnished with al- 

 bumen ; (2) "when the perisperm 

 is reduced to a single lamina, or 

 when the seed is not furnished with 

 a true perisperm " (Henslow) ; 

 Perisporan'gium .(a-wopd, a seed, 

 dyyetbi', a vessel), the indusium 

 of Ferns, a membranous covering 

 of the sorus; Per'ispore, Peris- 

 por'ium, -rum, (1) the membrane 

 or case surrounding a spore ; (2) 

 the mother-cell of spores in Algae ; 

 (3) = PERIGYNIUM ; Peristach'ynmt 

 (<TT<ix v s> a spike), the glume of 

 grasses ; Peristamin'ia ( + STAMEN), 

 Periste'mones (o-r^w^, a filament), 

 applied to petalous dicotyledons 

 with perigynous stamens ; Per'i- 

 stem (foTTjfju, I stand), young cortex 

 in a nascent condition ; Per'istome 

 Perist'oma, Peristom'ium (ffTdpa, 

 a mouth), the fringe or its homo- 

 logue round the orifice of a moss- 

 capsule ; perist'omate, peristoma'- 

 tus, perist'omus, provided with a 

 peristome ; peristomat'ic, peristo- 

 mat'icus, when perigynous stamens 

 are attached round the mouth of 

 the calyx tube; peristy'licus ( + 

 STYLUS), when epigynous stamens 

 are inserted between the styles 

 and limb of the calyx ; Perisy'phe 

 more correctly PERISCYPHE ; Per'i- 

 thece = Perithe'cium, pi. Perithe'- 

 cia (dijKrj, a case), (1), a case with 

 a small opening containing asci, 

 in Lichens ; (2) in Fungi, a re- 

 ceptacle enclosing spores which 

 are naked or in asci ; perithe'cioid 

 (eldoj, like) Glands, those on the 

 pitcher of Nepenthes, resembling 

 the perithecium of a Sphaeria 

 (Macfarlane) ; perit'ropal, perit'- 

 ropous, -pun (rpoiTT], 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'ic (+ XY- 

 LEM), said of concentric bundles in 

 the roots of Acorus, Juncaceae and 



Cyperaceae (Laux); perixy'lic, Van 

 Tieghem's expression for MESARCH 

 f EXARCH ; Perizo'nium (t&vr), a 

 belt), the thin non-silicious mem- 

 brane of a young auxospore. 



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

 a pearl), (1) shining with a pearly 

 lustre ; (2) furnished with rounded 

 tubercular appendages (Henslow). 

 NOTE : not to be confounded with 

 perlatus, carried through, derived 

 from pcrfero. 



per'manent, per'manens (permaneo, I 

 persist), persistent ; ^Tis'sue, 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 

 substances out of or into its 

 vacuoles respectively (Janse). 



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

 changing), enlargement of the 

 floral envelopes with abortion of 

 the sexual organs (Penzig). 



pernmta'tus (Lat.), completely 

 changed. 



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

 affection resembling an ulcer, 

 caused by cold. 



Perocid'ium + (irepl, about, 6ytadiov, a 

 tubercle), Necker's term for PERI- 

 CHAETIUM. 



per'onate, perona'tus (Lat., leather 

 booted), thickly covered with a 

 woolly covering becoming mealy. 



Perovula'tae (per, much or very, 

 owdatus, ovuled), otherwise SEMI- 

 NATAE, Van Tieghem's terms for 

 phanerogams furnished with true 



perpe'lic (per, very, 7n;Xos, clay), 

 Thurmann's term for rocks which 

 yield clay, pure and abundant, also 

 the plants which thrive thereon; 

 perpsam'mic (^6^03, sand), yield- 

 ing an abundance of sandy detritus, 

 with the flora thereon growing. 

 ' 



used of an organ with its direction 



190 



