51 



externum (outer peridium), the outer- 

 most layer which opena in various ways 

 and separates from the peridpum 

 internum (inner peridium), a layer 

 directly enclosing the gleba. 



Perien'chtma— Irregular cellular tissue, 

 chiefly in glands and spheroidal 

 masses. 



Pbkigt'nous (i.e., round the ovary)— The 

 term is applied to petals, &o., when the 

 disk bearing them is quite free from the 

 ovary ; but is more or less combined 

 with the base of the calyx-tube. The 

 ovary is then still described a.s free or 

 superior, even though the combined 

 disk and calyx-tube may form a deep 

 cup with the ovary lying at the bottom ; 

 the calyx is said to be free or inferior, 

 and the petals are described- as 

 inserted on the calyx. 



Periphbk'al — The outer portion of a 

 circle. 



Pbk'ispeem, Pbeispeb'mium, Pbrispee'mum 

 — Synonym for " Albumen." 



Pee'istomb — The opening of the sporangium 

 of mosses after the removal oi the 

 calyptra and operculum. 



Pbeithe'oia — The cysts or capsules con- 

 taining the asci. 



Peeithe'ciom — The envelope surrounding 

 the masses of fructification in Fungi and 

 Lichens. 



Pbb'iteopal, Pbu'itropus— Where the axis 

 of a seed is perpendicular to the axis of 

 the pericarp, to which it is attached. 



Pbela'eius, Peela'tus — Shining with a 

 pearly lustre ; furnished with rounded 

 tubercular appendages. 



Peepdsil'lus — Synonym for "Pusillus.'' 



Persist'ent — When any part or organ, in 

 particular plants, remains beyond the 

 period of maturity and fall, appointed 

 for similar parts in other plants ; or to 

 the period of full maturity attained by 

 neighbouring parts. 



Pbk'sonate, Peesona'tus — A form of 

 monopetalous bilabiate corolla, where 

 the orifice of the tube is closed by an 

 inflated projection of the throat. 



Pbetu'sus — Synonym for " Perf oratus. " 

 (See the outer glume of Andropogon 

 pertusus. ) 



PbeVious, Peevius— Admitting the pas- 

 sage of some portion without interrup- 

 tion ; as where the pith is continued 

 through a node in the stem, 



Peb'ula — Little pouch. A sac formed in 

 some orchids by the prolonged and 

 united bases of two of the segments of 

 their perianth. The oup-like covering 

 of buds, formed by the abortion of 

 their outer leaves. 



Pes^A foot, or, as in Ipomoea Pes-capras, 

 from the supposed resemblance of the 

 leaves to the foot of a goat. 



Pex'al, Pb'talum — One of the foliaceous 

 expansions constituting the subordinate 

 parts of the floral whorl, termed the 

 corolla. They are usually alternate 

 with the sepals ; that is to say, the 

 centre of each petal is immediately over 

 or within the interval between the 

 sepals. Pbtalodeds— Where a double 

 flower is formed by the transformation 



of any of the parts about the corolla 

 into petal-like expansions. Pbtaioid 

 — Kesembling petals. 



Pet'iolb, Peti'olos — The stalk or support 

 by \yhich the blade or limb of a leaf 

 is attached to the stem. Petiola'ted— 

 Furnished with a petiole or leafstalk. 

 The separate stalk of each leaflet in a 

 compound leaf is termeil a petioiule. 



PHa;NOG;'AMOus, Phaneeogamous, Fhm- 

 nog'amus, Phaneeogamus— Plants of 

 the two classes, Dicotyledons and Mono- 

 cotyledons, in which the male and 

 female organs are apparent, in one 

 shape ^ or another, at some period of 

 their life. 



Phal'lus— A name given to a genus of 

 fungi from a supposed resemblance ; 

 the species are not without beauty, 

 but are^ nearly all foetid. 



Phjem'cbous, PmENi'oBtTS — Purple ; red, 

 very slightly tinged with grey. 



Phi'los— Fond, as in Nemophila. 



Phleps — A vein. 



Phlo'ia — A termination used in many of 

 the specific names derived from the 

 Greek, and signifies bark. (See 

 Euealyptus hemiphloia, "half barked"; 

 E. melanophloia, " black barked "; E. 

 ochrophloia, " yellow barked "; E. side- 

 rophloia "iron barked." 



Pheagmi'geeus— Where an otherwise con- 

 tinuous cavity is separated into 

 subordinate parts by transverse par- 

 titions of a membranous or cellular 

 character. 



Phtl'laeies — A useless term, which has 

 been introduced for the bracts or scales 

 of the involucre of Compositae. 



Phtllo'dium — When the limb of a leaf is 

 abortive, and the petiole becomes 

 developed into a flattened expansion, 

 like mostof Australian Acacias, wattles, 

 brigalow, myall, &o. Phyllodi'Neus 

 — Bearing phyllodia. 



Phtl'loma— The aggregate mass of germs 

 contained in a leaf -bud. 



Phylioma'nia — Leaf -madness ; where a 

 superabundance of leaf-buds is formed 

 in comparison with flower-buds. 



Phtllotax'is— The manner in which leaves 

 are arranged upon the stem. 



PHTli'LtTLA — The scar left on the branch by 

 the fall of a leaf. 



Phtmato'deus — Synonym for "Verru- 

 cosus. " ' 



Phy'sa — A bladder. 



Physe'ma, Physed'ita — A swelling. 

 Synonym for "Frond " in the aquatic 

 AlgEe ; also a branch of a Chara. 



Physiol'ogy— That part of Botany which 

 treats of the functions of plants. 



Psytog'eaphy, Phytogea'phia— That de- 

 partment of Botany which includes 

 the description of plants. 



Ehy'toliths — Fossil plants. 



Phytol'ogy, Phytol'ogia (Phyton, a plant ; 

 and logos, a discourse) — Synonym for 

 "Botany." 



Phytono'mia— Synonym for "Botanical 

 Physiology." 



Phytony'mia — Synonym for " Organo- 

 graphia." 



