Phylogenesis 



Pilidium 



I congeal), the gelatine of Algae ; 

 Phytogen'esis (y^veats, beginning), 

 the origin and development of the 

 plant ; Phytog'eny, means the same 

 as the last; Phytogeog'raphy, 

 Phytogeograph'ia (797, the earth, 

 ypd(pu, I write), geographic botany, 

 the science of plant distribution ; 

 Pbytogno'sis (yvCxjLs, knowledge), 

 botany, phytology ; Phytog'raphist 

 (ypa<pt), a writing), a describing 

 botanist ; Phytog'rapliy, the de- 

 scription and illustration of plants, 

 descriptive and systematic or taxi- 

 nomic botany ; phy'toid (elSos, like- 

 ness), plant-like ; Phy'tolite (Xi'0os, 

 a stone) ; Phy'tolith, a plant in the 

 fossil condition ; Phytolithol'ogy, 

 (\<>7os, discourse), the study of 

 fossil-plants, palaeobotany ; Phy- 

 tol'ogist, a botanist ; Phytol'ogy, 

 Phytolo'gia, botany, the study of 

 plants ; Phytol'ysis (XvVis, a loos- 

 ing), an error (?) for PHOTOLYSIS ; 

 phytomastig'opod, see MASTIGOPOD; 

 Phy'tomer, pi. Phytom'era (^pos, 

 a part), the unit of a plant, an 

 internode with its leaves, an 

 emendation of Phy'ton, applied by 

 Gaudichaud to a plant-unit, out 

 of a succession of which plants are 

 built up ; Phyton'omy, Phytonom'ia 

 (i>6no$, law), botanic physiology ; 

 Phytonym'ia (8vofj,a, a name), plant 

 organography ; Phytoplank'ton 

 (+ PLANKTON), floating pelagic 

 plant organisms ; Phytopathol'ogy 

 (7ra0oX<>7i/c6s, relating to diseases), 

 vegetable pathology, the science 

 of plant-diseases ; Phytopol'itus J 

 (iroXlTys, a citizen), a plant which 

 is or seems to be parasitic ; Phyto- 

 ptocecid'ia (JC^JKS, a gall), galls 

 caused by Fungi (Loew) ; Phyto- 

 stat'ics (<rrd(ri9, a standing), the 

 various causes which tend to pro- 

 duce equilibrium in the energies 

 of a plant ; Phytotero'sia (repcu, 

 I pierce), Desvaux's term for 

 plant pathology ; Phytoteratol'ogy 

 (+ TERATOLOGY ) ; the study of 

 monstrous growths in plants ; 

 Pnytot' omy (TO^, a cutting), plant 



anatomy, or histology ; Phyto- 

 troph'ia (rpo^, nourishment), 

 plant culture ; Phytozo'id (fwov, 

 an animal, e!5os, likeness) = ANTHE- 

 BOZOID; Phytozo'a, pi. of Phyto- 

 zo'on, antherozoids, mobile fertiliz- 

 ing bodies formed in antheridia. 



pic'eus (Lat.), pitchy black. 



Pic'ro-er'ythrin (wiKpos, bitter, + 

 ERYTHBIN), a substance found in 

 Lichens ; Picrotox'in (ro&Kbv, 

 poison), a crystalline narcotic 

 bitter ingredient in the berries of 

 Coccidus indicus, the mediaeval 

 and trade name of Anamirta 

 paniculata, Coleb. ; adj. picro- 

 tox'ic. 



pic'tus (Lat., painted), adorned with 

 colour, as though painted. 



Pie'tra funga'ia (Ital.), "Mushroom- 

 stone," the sclerotium of Poly- 

 porus tuberaster, Fr. 



pUa'ris J (Lat., from pilus, a hair), 

 composed of small hairs, pilose. 



pileate, pilea'tus (Lat., wearing the 

 pileus), having the form of a cap 

 or PILEUS ; pileiform, pileiform'is 

 (forma, shape), pileus shaped, 

 Pi'leola, Pile'olus (pileolum, a little 

 cap), (1) a small cap or cap-like 

 body ; defined by Henslow as a 

 primordial leaf like an extin- 

 guisher, which encloses the bud ; 

 (2) the diminutive of PILEUS; (3) 

 "the receptacle of certain Fun- 

 gals " (Lindley). 



Pileorhi'za (TtXeos, pileus, a cap, pi fa, 

 a root), the root-cap, a hood at 

 the extremity of the root ; Pi'leus, 



(1) a convex expansion terminating 

 the stipe of Agarics, and bearing 

 the hymenium, now extended to all 

 sporophores in which the hyme- 

 nium faces the ground, the CAP; 



(2) used by R. T. Lowe to express 

 the habit of Convolvulus Caput- Me- 

 dusae, Lowe. 



Pi'li, pi. of Pi'lus (Lat. a hair), hairs. 



Pilid'ium (triXtdiov, a night-cap), an 

 orbicular hemispherical shield in 

 Lichens, the outside changing into 

 a powdery substance, as in Cali- 



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