Perichaeth 



Perigynandra 



ous stamens arranged concentrically 

 with the calyx; Per'ichaeth 

 (Crozier) = PERICHAETIUM ; Peri- 

 chae'timn (XCIITI;, a mane) ; (1) the 

 involucre around the base of the 

 seta in Mosses ; (2) Hooker's name 

 for the perianth in Hepaticae ; 

 perichae'tial, perichaetia'lis, relat- 

 ing to the same, as ~ Bracts, ^ 

 Leaves, the organs composing the 

 perichaetium itself in Mosses, and 

 the involucre in Hepaticae j Per'i- 

 chyle (xvXos, juice), a plant 

 whose water - storing tissue is 

 between the epidermis and the 

 chlorenchyma, as Rhizophora, ; 

 Per'icladium (/cXaSos, a branch), 

 the sheathing base of a leaf when 

 it surrounds the supporting branch; 

 pericli'nal (/cXivw, I bend down), 

 curved in the same direction as 

 the surface or circumference ; 

 Planes, planes which conform to 

 the exterior ; Perlclines, periclinal 

 walls ; Pericli'nium (K\IVIJ, a bed), 

 the involucre of the capitulum in 

 Compositae ; Periclinoi'des, J a false 

 involucre formed of the scales of 

 the receptacle in Compositae, sur- 

 rounding the sides of an elevated 

 receptacle at its summit, as in 

 Evax; Pericoc'cium, that portion 

 of the protoplasm which envelopes 

 the nucleus ; in Germ. Kerntasche 

 (Hanstein) ; Pericorium (/toXeos, a 

 sheath) = PERICHAETIUM ; peri- 

 corolla'tus (+ COROLLA), used of 

 a dicotyledonous plant with a 

 gamopetalous perigynous corolla ; 

 Per'icycle (xikXos, a circle), the 

 outermost zone of cells of the stele 

 immediately within the endodermis; 

 internal <~, Flot's term for the pro- 

 cambium retained on the inner side 

 of the vascular bundle ; Per'iderm, 

 Perider'ma, Perider'mis(8ep/jt,a, skin 

 or hide), the outer bark or epi- 

 phloem, at first restricted by 

 Mohl to tough cork in distinction 

 to the soft cork, now extended 

 to the cork cambium and its pro- 

 ducts ; phellogen ; Per'idesm (Stew, 

 a bundle), the layer of cells which 



surround each vascular bundle 

 beneath the special endoderm in 

 astelic stems (Van Tieghem) ; adj. 

 perides'mic. 



Perid'iole, Perid'iolum, pi. Perid'iola 

 (dim. of PERIDIUM from irtjpl8iov y a 

 little pouch), (1) a chamber of the 

 gleba forming a nest of spores, free 

 or attached by a funicle within the 

 peridium of the sporophore ; (2) 

 "a membrane by which the spores 

 of some Algae are immediately 

 covered " (Lindley) ; Perid'inin, 

 one of the colouring matters found 

 in the Peridieae, a group of Fungi ; 

 Perid'ium, a general expression for 

 the outer enveloping coat of a 



rrophore upon which the spores 

 elop within a cavity; ~ ex- 

 ter'num, the outer layer which 

 opens in various ways and separates 

 from the <- inter'num, the inner 

 layer directly enclosing the gleba ; 

 ~ mitrifor'me, " the receptacle of 

 certain Fungals " (Lindley) ; adj. 

 perid'ial; as ~ Cells, the outer 

 cells of a peridium which are 

 coherent. 



Perid'roma (TrepiSpo/^J, a circuit), 

 Necker's term for the rhachis of 

 Ferns. 



Periench'yma (ircpi, about, eyxvpa, 

 an infusion), irregular cellular 

 tissue, chiefly in glands and sphe- 

 roidal masses (Henslow), cf. PER- 

 ENCHYMA ; Perifor'ium = PERI- 

 PHORIUM ; Perigloe'a (7X0405, glue), 

 the entire gelatinous investment of 

 a Diatom (Buff ham) ; Per'igone, 

 Perigo'nium (70^77, offspring), (1) 

 a synonym of PERIANTH ; (2) the 

 same of PERICHAETIUM ; (3) the 

 involucre of the male inflorescence 

 in Bryophytes ; adj. perigo'nial, 

 as ~ Leaves, the perichaetial 

 leaves (excluding Bryophytes) ; 

 perigonia'rius, (1) with the char- 

 acter of a perigone ; (2) double 

 flowers, resulting from transforma- 

 tion or multiplication of the floral 

 organs taking on the character of 

 perianth segments ; Perigynan'da, 

 Perigynan'dra, -drum (yvvrj, a 



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