Perichaeth 



Perigynandra 



ous stamens arranged concentrically 

 with the calyx; Per'ichaetn 

 (Crozier) = PERICHAETIUM ; Peri- 

 chae'tium (xalrij, 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'fis, relat- 

 ing to the same, as ~ Bracts, ~ 

 Leaves, the organs composing the 

 perichaetium itself in Mosses, and 

 the involucre in Hepaticae ; Per'i- 

 chyle (xv\6s, juice), a plant 

 whose water - storing tissue is 

 between the epidermis and the 

 chlorenchyma, as Rhizophora ; 

 Per'icladium (/cXa5os, a branch), 

 the sheathing base of a leaf when 

 it surrounds the supporting branch; 

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

 curved in the same direction as 

 the surface or circumference ; ~ 

 Planes, planes which conform to 

 the exterior ; Per'iclines, periclinal 

 walls ; Pericli'nium (/cXtcr?, 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) ; Pericoi'ium J (KoXeds, a 

 sheath) = PEKICHAETIOM ; peri- 

 corolla' tus (+ COROLLA), used of 

 a dicotyledonous plant with a 

 gamopetalous perigynous corolla ; 

 Per'icycle (KUK\OS, a circle), the 

 outermost zone of cells of the stele 

 immediately within the endodermis; 

 inter'nal ~ , Flot's term for the pro- 

 cambium retained on the inner side 

 of the vascular bundle ; Per'iderm, 

 Perider'ma, Perider'mis(8cp/na, skin 

 or hide), the outer bark or epi- 

 phloe'm, 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 (Stepy, 

 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 ir-qpiSiov, 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 

 sporophore upon which the spores 

 develop 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 (TreptSpo^T), a circuit), 

 Necker's term for the rhachis of 

 Ferns. 



Periencn'yma (irepi, about, eyxv/JM, 

 an infusion), irregular cellular 

 tissue, chiefly in glands and sphe- 

 roidal masses (Henslow), cf. PER- 

 ENCHYMA ; Perifor'ium = PERI- 

 PHORIUM ; Perigloe'a (7X0105, glue), 

 the entire gelatinous investment of 

 a Diatom (Buffham) ; Per'igone, 

 Periyo'nium (yoi>Tj, 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 (ywi), a 



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