Perianthomania OF BOTANICAL TERMS. 



Perisperm 



calyx only, or to calyx and in- 

 volucre. 



PfcRiAlTTHlUM, see Perianth. 



PERIANTHOMANIA, an unnatu- 

 ral multiplication of sepals, 

 bracts, etc. 



PfiR'IBLEM, the primordial cor- 

 tex, i.e., the layer of nascent 

 cortex beneath the dermatogeu. 



PERICAM'BIUM, see Phloem- 

 sheath. 



PER'fcARP, the wall of a ripened 

 ovary or seed-vessel. Some- 

 times improperly applied to 

 husks or other protective cov- 

 erings surrounding the fruit. 



PER't€H.ETH, the involucre of 

 leaves arouud the base of the 

 seta (or sessile capsule) in 

 mosses; also around the ar- 

 chegonia in Marchantia, etc.; 

 perichaetium. 



PERICHiE'TIAL, belonging or 

 pertaining to the perichaeth. 



PERiCH-ffi'TitJM, see Peri- 



CH^ETH. 



PERICLA'DltJM, a sheathing peti- 

 ole in exogens, as in many 

 Umbel liferse. (Rare.) 



PERtCLI'NAL, said of cell-walls 

 or any lines when parallel with 

 the outer surface of the plant 

 or organ. Compare Anticli- 

 nal. The annual rings of a 

 trunk, for example, extend 

 in a periclinal direction, and 

 the medullary rays in an anti- 

 clinal. 



PERiCLiN'ffTM, a name for the 

 involucre in Compositae. 



PflRlCYCLE, the outer portion 

 of the central or nbrovascular 

 cylinder. 



PERIDERM, see Epiphlozum. 

 Also applied to the cell-wall 

 or any other enclosing mem- 

 brane. 



PERIDI'OLtfM (pi. Peridi'ola), di- 



minutive of Peridium: a sec- 

 ondary or interior peridium 

 containing a hymenium, as in 

 Crucibulum. 



PERiD'itJM (pi. Perld'Ia), the cov- 

 ering of almost any closed 

 spore-case, or fungus- fruit, as 

 of a puff-ball. 



PflR'IGONE, see Peiuanth. 



PERIGO'NiUM (pi. Pengd'nia), 

 see Perianth. Sometimes 

 used for Perichaetb. 



PERlGYNltJM (pi. Perigyn'Ia), a 

 term applied to various appen- 

 dages of unusual or doubtful 

 character surrounding the pis- 

 til, as the sac -like envelope 

 (utriculus) surrounding the 

 ovary in Carex. Also used 

 for Perichaeth in Hepaticae and 

 mosses. 



PERlG'YNOtJS, adherent to the 

 calyx aud free from the ovary: 

 said of stamens. 



PERlPET'ALOtJS, around the 

 petals. 



PERfPHER'iC, situated around 

 the outside or periphery. 



PERlPHLO'fiM, see Phloem- 

 sheath. 



PERIPHORAN'THiUM, see Peri- 



CLINIUM. 



PERiPHYL'LUM (pi. Periphyl'la), 

 see Lodicule. 



PfiR'IPLASM, a hyaline periph- 

 eral layer of protoplasm; ecto- 

 plasm. Especially, in Pero- 

 nosporeae, a part of the 

 protoplasm in the oSgonium 

 and antheridium which does 

 not take part in fertilization. 

 Compare Gonoplasm. 



PERlP'TEROUS, surrounded by 

 a wing-like expansion. 



PflR'ISPERM, the albumen of a 

 seed, especially that formed 

 outside the embryo-sac. Some- 

 times applied also to the seed- 



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