Perigynium 



Perlsperm 



woman, avr/p, dvdpos, a man), (1) 

 the involucre of Compositae ; <~ 

 commu'nis, ~ exte'rior, the in- 

 volucre, ~ inte'rior, the corolla of 

 a composite floret ; Perigyn'ium, 



(1) the hypogynous setae of sedges ; 



(2) the flask or utricle of Carex ; 



(3) any hypogynous disk ; (4) the 

 involucre of the female inflor- 

 escence in Bryophytes ; perig'- 

 ynous, literally means round the 

 ovary, used of organs adnate 

 to the perianth, or adnate with 

 the lower part of the pistil ; 

 Perikar'yoplasm (Kapvov, a nut, 

 7rXdcT|U,a, moulded), a zone of 

 granular protoplasm seen in Cobaea 

 scandens, Cav., in the cytoplasm 

 of the resting pollen mother-cell 

 on its approaching division (A. 

 A. Lawson) ; perimedul'lary ( 4- 

 MEDULLARY) Zone, the peripheral 

 region of the inner tissue out- 

 wardly bounded by the pro- 



toxylem ; cf. CIRCUMMEDDLLARY ; 



Perimel'itae (mel, honey), having 

 honey-glands placed in the lower 

 portion of the perianth, as in 

 certain Gentianaceae (Huxley) ; 

 Perimer'istem ( + MERISTEM), con- 

 sists of several layers of cells 

 which at first divide in every di- 

 rection, but subsequently divide 

 tangentially in the external region 

 (Guillaud ) ; Per'ine (Trept, about), the 

 outermost layer of sculpturing on 

 pollen ; perinectar'ial ( + NECTARY), 

 surrounding the nectarial area, 

 as in certain Gentians (Huxley) ; 

 Perin'ium, the outermost of the 

 three coats of a Fern spore ; the 

 epispore. 



perin'teger (Lat. ), quite entire. 



Periodic Move'ments, used to express 

 the opening and closing of flowers, 

 the nyctitropic movements of 

 leaves, etc., when occurring habit- 

 ually and with some regularity. 



peripet'alous, -MS (Trept, about, 

 -rreraXov, a flower-leaf), around the 

 petals. 



peripheral (wepirfiepeia, the circum- 

 ference of a circle), surround- 



ing ; ~ Tis'sue, in roots, the 

 piliferous layer, furnished with 

 root hairs ; peripher'ic, prripher'i- 

 cus, pertaining to the circumfer- 

 ence, as of an embryo coiled round 

 the outside of the albumen ; 

 peripher'ico-termina'lis, belonging 

 to the circumference and apex of a 

 body, used of stems which grow 

 both in length and breadth ; peri- 

 phae'ricus, peripheric, circumferen- 

 tial. 



Peripnlo'em (Trept, about + PHLOEM), 

 the phloem-sheath or pericambium ; 

 periphloemat'ic, applied to concen- 

 tric bundles in Ferns ; Periphoran'- 

 thium (<poptu, I carry, avdos, a 

 flower), the involucre of Com- 

 positae ; Peripnor'ium, a fleshy and 

 elongated support to the ovary, 

 with the corolla and stamens 

 attached to it ; Henslow spells 

 it " Periforium " ; Per'iphragm 

 (cf>pdy/j.a, an enclosure), the peri- 

 cycle of the stem (Dangeard) ; 

 Per'iphylls, Periphyl'lia J (</wXXoi/, a 

 leaf), the hypogynous scales or 

 lodicules of grasses ; Periphyl- 

 log'eny (yevos, race, offspring), 

 bearing numerous leaflets round 

 the edge of a leaf -blade (Weis- 

 mann) ; Periph'ysis (<p6u>, I grow), 

 a sterile capilliform hyphal 

 branch, projecting from the wall 

 of the pyrenocarp when there 

 is no hymenium in the cavity 

 (Fuisting) ; Per'iplasm (ir\d(r/j.a, 

 moulded), protoplasm in the 

 oogonium and the antheridium 

 which does not share in the con- 

 jugation ; cf. GONOPLASM ; Per'i- 

 plast (TrXdo-Tos, moulded), a hyaline 

 structure enveloping the cell- 

 nucleus ; Peripod'ium (TTOVS, TroSos, 

 a foot), = PKRICHAETIDM ; perip'- 

 terous, -rus (irrepov, a wing), perip- 

 tera'tus, surrounded by a wing or 

 border ; Periscy'phe (ffKv<pos, a cup), 

 Desvaux's word for PERICHAETIUM ; 

 Per'isperm, Perisper'mium (awep/j.a, 

 a seed), (1) the ordinary albumen 

 of a seed, restricted to that 

 which is formed outside the 



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