Phytogenesis 
Pilidium 
I congeal), the gelatine of Algae ; 
Phytogen’esis (yéveois, beginning), 
the origin and development of the 
plant ; Phytog’eny, means the same 
as the last; Phytogeog’raphy, 
Phytogeograph’ia (yf, the earth, 
ypapu, I write), geographic botany, 
the science of plant distribution ; 
Phytogno’sis (y&ors, knowledge), 
botany, phytology ; Phytog’raphist 
(ypaey, a writing), a describing 
botanist ; Photog Tank, the de- 
scription and illustration of plants, 
descriptive and systematic or taxi- 
nomic botany; phy’toid (eldos, like- 
ness), plant-like ; Phy’tolite (Aidos, 
a stone); Phy’tolith, a plant in the 
fossil condition ; Phytolithol’ogy, 
(Aéyos, discourse), the study of 
fossil-plants, palaeobotany; Phy- 
tol’ogist, a botanist; Phytol’ogy, 
Phytolo'gia, botany, the study of 
plants; Phytol’ysis (Avois, a loos- 
ing), an error (?) for PHOTOLYSIS ; 
phytomastig’opod, see MASTIGOPOD; 
Phy'tomer, pl. Phytom’era (épos, 
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 
(véuos, law), botanic physiology ; 
Phytonym’ia (dvoua, a name), plant 
organography ; Phytoplank’ton 
(+ Pranxron), floating pelagic 
plant organisms; Phytopathol’ogy 
(rafodoy:xds, relating to diseases), 
vegetable pathology, the science 
of plant-diseases ; Phytopol’itus + 
(roXlrys, a citizen), » plant which 
is or seems to be parasitic; Phyto- 
ptocecid’ia («jxs, a gall), galls 
caused by Fungi (Loew); Phyto- 
stat‘ics (ordows, a standing), the 
various causes which tend to pro- 
duce equilibrium in the energies 
of a plant; Phytotero’sia (repéw, 
I pierce), Desvaux’s term for 
plant pathology ; Phytoteratol’ogy 
(+ TeratoLocy), the study of 
monstrous growths in plants ; 
Phytot’omy (roxy, a cutting), plant 
196 
anatomy, or histology; Phyto- 
troph’ia (rpody, nourishment), 
plant culture; Phytozo’id (Gor, 
an animal, eldos, likeness) = ANTHE- 
ROZOID; Phytozo’a, pl. of Phyto- 
zo’on, antherozoids, mobile fertiliz- 
ing bodies formed in antheridia, 
pic’eus (Lat.), pitchy black. 
Pic'ro-er’ythrin (mxpos, bitter, + 
ERytTHRIN), a substance found in 
Lichens ; Picrotox’in (rof«kdy, 
pee), a erystalline narcotic 
itter ingredient in the berries of 
Cocculus indicus, the medieval 
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 ([tal.), ‘*‘ Mushroom- 
stone,” the sclerotium of Poly- 
porus tuberaster, Fr. 
pilaris t (Lat., from pilus, a hair), 
composed of small hairs, pilose. 
pi'leate, pilea'tus (Lat., wearing the 
pileus), having the form of a cap 
or PILEUS; pileiform, pileiform’is 
(forma, shape), pileus shaped, 
Pileola, 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 Prmxvs; (3) 
“the receptacle of certain Fun- 
gals” (Lindley), 
Pileorhi’za (7/Acos, pileus, a cap, plfa, 
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, pl. of Pi'lus (Lat. a hair), hairs. 
Pilid‘ium (mAldiov, a night-cap), an 
orbicular hemispherical shield in 
Lichens, the outside changing into 
a powdery substance, as in Cali- 
cium. 
