Phylogenesis 



Pilidium 



I congeal), the gelatine of Algae ; 

 Phytogen'esis (ye'veais, beginning), 

 the origin and development of the 

 plant ; Pbytog'eny, means the same 

 as the last ; Phytogeog'rapny, 

 Pitytogeograph'ia (yij, the earth, 

 7pd</>w, I write), geographic botany, 

 the science of plant distribution ; 

 Phytogno'sis (yvuxris, knowledge), 

 botany, phytology ; Phytog'raphist 

 (ypa<j>T], a writing), a describing 

 botanist ; Phytog'raphy, the de- 

 scription and illustration of plants, 

 descriptive and systematic or taxi- 

 nomic botany ; pny'toid (eZ5os, like- 

 ness), plant-like ; Pny'tolite (Atfos, 

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

 fossil condition ; Phytolithol'ogy, 

 (\6yos, discourse), the study of 

 fossil-plants, palaeobotany ; Phy- 

 tol'ogist, a botanist ; Phytol'ogy, 

 Phytolo'gia, botany, the study of 

 plants ; Phytol'ysis (\va-is, a loos- 

 ing), an error (?) for PHOTOLYSIS ; 

 phytomastig'opod, see MASTIGOPOD; 

 Phy'tomer, pi. Phytom'era (ntyos, 

 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 

 (vofj-os, law), botanic physiology ; 

 Phytonym'ia (6i>o/j.a, a name), plant 

 organography ; Phytoplank'ton 

 (+ PLANKTON), floating pelagic 

 plant organisms ; Phytopathology 

 (wadoXoyiKos, relating to diseases), 

 vegetable pathology, the science 

 of plant-diseases ; Phytopol'itus 

 (iro\iT7]s, a citizen), a plant which 

 is or seems to be parasitic ; Phyto- 

 ptocecid'ia (KTJKIS, a gall), galls 

 caused by Fungi (Loew) ; Phyto- 

 stat'ics (crrdcrtv, a standing), the 

 various causes which tend to pro- 

 duce equilibrium in the energies 

 of a plant ; Phytotero'sia (repeu, 

 I pierce), Desvaux's term for 

 plant pathology ; Phytoteratol'ogy 

 ( + TERATOLOGY), the study of 

 monstrous growths in plants ; 

 Phytot'omy (TOM, a cutting), plant 



anatomy, or histology ; Phyto- 

 troph'ia (rpo(f>i], nourishment), 

 plant culture ; Phytozo'id (i'uov, 

 an animal, et5o?, likeness) = ANTHE- 

 ROZOID ; Phytozo'a, pi. of Phyto- 

 zo'on, antherozoids, mobile fertiliz- 

 ing bodies formed in antheridia. 



pic'eus (Lat.), pitchy black. 



Pic'ro-er'ythrin (Trt/cpos, bitter, + 

 ERYTHRIN), a substance found in 

 Lichens ; Picrotox'in (TOIKOI>, 

 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 tulieraxter, Fr. 



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

 composed of small hairs, pilose. 



pi'leate, pilea'tus (Lat., wearing the 

 pileits), having the form of a cap 

 or PILEUS ; pi'leiform, pikiform' is 

 (forma, shape), pileus shaped, 

 Pi'leola, Pttt'olus (piteohim, 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 (Tu'Aeos, pileus, a cap, pt'ja, 

 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 (iriXidiof, a night-cap), an 

 orbicular hemispherical shield in 

 Lichens, the outside changing into 

 a powdery substance, as in Cali- 



cium. 



196 



