Perimelitae 



Ferisporinium 



Perimeritae {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 direction, 

 but subsequently divide tangentially 

 in the external region (Guillaud) ; 

 perimicrop'ylar ( + Micropyle), 

 situated near or round the micro- 

 pyle; Per'ine, the outermost layer 

 of sculpturing on pollen ; perinec- 

 tar'ial ( + Nectary), suiTounding 

 the nectarial area, as in certain 

 Gentians (Huxley) ; Perin'ium (Mod. 

 Lat.), the outermost of the three 

 coats of a Fern spore ; the epispore, 



perin'teger (Lat.), quite entire. 



perinu'cleolar (^epi, about, -\- 

 NucLEOLUs) ; Vac'uole, a clear zone 

 surrounding each nucleolus in 

 prophase of pollen-mother-cells 

 (Stevens). 



Per'iod, la'tent, see latent Period. 



Period'ic Movements, used to express 

 the opening and closing of flowers, 

 the nyctitropic movements of leaves, 

 etc., when occurring halsitually and 

 with some regularity, 



peripet'alous, -us (-n-epi, about; irira- 

 Xov, a flower-leaf ), around the petals. 



periphae'ricus {irepicpepeia, the circum- 

 ference of a circle), peripheric, circum- 

 ferential ; periph'eral, surrounding ; 

 '-' Steles, four long curved steles in 

 Psaronius from which adventitious 

 roots take their origin (Zeiller) ; 

 '^ Tis'sue, in roots, the piliferous 

 layer furnished with root hairs ; 

 peripher'ic, peripher'icus, pertain- 

 ing to the circumference, as of an 

 embryo coiled round the outside 

 of the albumen ; peripher'ioo- 

 termina'lis, belonging to the 

 circumference and apex of a body, 

 used of stems which grow both in 

 length and breadth. 



Periphlo'em (Trepl,' about -f Phloem), 

 the phloem-sheath or pericambium; 

 periphloemat'ic, applied to concen- 

 tric bundles in Ferns ; Periphoran'- 

 thium {<pop4w, I carry ; 6.v9os, a 



275 



flower), the involucre of Compositae; 

 Periphor'ium, a fleshy and elongated 

 support to the ovary, with the 

 corolla and stamens attached to it ; 

 J. S. Henslow spells it " Perifor- 

 ium " ; Per'iphragm {(ppdyfia, an 

 enclosure), the pericycle of the stem 

 (Dangeard);Perlpliylls,Periphyriia 

 I pi. {(pvWov, a leaf), the hypogynous 

 scales or lodicules of grasses ; Peri- 

 phyllog'eny {yevos, race, offspring), 

 bearing numerous leaflets round the 

 edge of a leaf-blade (Weismann) ; 

 Periph'yses, pi. {(p^ffis, growth), 

 hairs of like origin to Paraphyses 

 but arising from the hymenium of 

 Ascomycetes at places destitute ot 

 asci (Bennett and Murray) ; Per'i- 

 plasm(7rAa(r/ia,moulded), protoplasm 

 in the oogonium and the antheridiura 

 which does not share in the conjuga- 

 tion ; cf. GoNOPLASM ; Per'iplast 

 (irXdaros, moulded), a hyaline struc- 

 ture enveloping the cell -nucleus; 

 Peripod'ium {irovs, irodhs, a foot) = 

 Perichaetium ; perip'terous, -rus 

 {irrephv, a wing), periptera'tus, 

 surrounded by a wing or border ; 

 Periscy'phe {aKv<pos, a cup), Des- 

 vaux's word for Perichaetium ; 

 Per'ispenn, Ferispcr'minm {airepfia, 

 a seed), (1) the oi-dinary albumen 

 of a seed*, restricted to that which 

 is formed outside the embryo sac ; 

 (2) the pericarp or even the inte- 

 guments of a seed; perisper'mic, 

 perisper'miciis, perisperma'tuB, (1) 

 furnished with albumen ; (2) " when 

 the perisperm- is reduced to a single 

 lamina, or when the seed is not 

 furnished with a true perisperm " 

 (J. S. Henslow) ; Perisporan'giuin 

 (a-iropa, a seed ; 0776101', a vessel), 

 the indusium of Ferns, a mem- 

 branous covering of the sorus ; 

 Per'ispore, Perispor'ium, -rum, (1) 

 tlm membrane or case surrounding 

 a spore ; (2) the mother-cell of spores 

 in Algae ; (3) = Peiugynium ; (4) 

 an incrustation containing much 

 silica, outside the exospore of 

 Jsoetes (Fitting) I'Perisporin'ium, the 

 outermost membrane of pollen in 



