perispermic 



perpendicular 



embryo sac ; (2) the pericarp or 

 even the integuments of a seed ; 

 perisper'mic, perisper'micus, peri- 

 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-?ropd, a seed, 

 dyyeioi>, 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'jnim+ 

 (vTdxvs, a spike), the glume of 

 grasses ; Peristamin'ia ( + STAMEN), 

 Periste'moues (ar^^uv , a filament), 

 applied to petalous dicotyledons 

 with perigynous stamens ; Per'i- 

 stem ('LffTTtfjLL, I stand), young cortex 

 in a nascent condition ; Per'istome 

 Perist'oma, Peristo/n'ium (ark^a, 

 a mouth), the fringe or its honio- 

 logue round the orifice of a moss- 

 capsule ; perist' ornate, ptristoma'- 

 tus, perist'omus, provided with a 

 peristome ; peristomat'ic, peris'o- 

 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 ; rer'i- 

 taece = Peritae'cium, pi. Perithe'- 

 cia (6iJK-r), 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 

 (etSos, like) Glands, those on the 

 pitcher of Nepenthes, resembling 

 the perithecium of a Sphaeria 

 (Macfarlane) ; perit'ropal, perit'- 

 ropous, -pus (rpoirri, 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 A com*, Juncaceae and 



Cyperaceae (Laux); perixy'lic, Van 

 Tieghem's expression for MESARCH 

 + EXARCH ; Perizo'nium (ftivij, 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 

 perlaius, 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 (pfrmeabilis, that can 

 be passed through), applied to 

 protoplasm, etc., and further dis- 

 tinguished as EXTRAMEAB1LITY, 

 and IKTRAMEABILITY, 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). 



permuta'tus (Lat.), completely 

 changed. 



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

 affection resembling an ulcer, 

 caused by cold. 



PerocicTium J (irepl, about, oyKiSiov, a 

 tubercle). Ntcker's term for PERI- 

 CHAETIUM. 



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

 booted), thickly covered with a 

 woolly covering becoming mealy. 



Perovula'tae (per, much or very, 

 owilatu*, ovuled), otherwise SEMI- 

 NATAE, Van Tieghem's terms for 

 phanerogams furnished with true 

 seeds. 



perpe'lic (per, very, 71-77X65, clay), 

 Thurmann's term for rocks which 

 yield clay, pure and abundant, also 

 the plants which thrive thereon; 

 perpsam'mic (i/'d/ct^os, sand), yield- 

 ing an abundance of sandy detritus, 

 with the flora thereon growing. 



perpendic'ular,;;" -;/ ^f i></^->ila'ris[La,t. ), 



used of ar orcwi with its direction 



190 



