132 PHARMACEUTICAL BOTANY 
PoLyMor’PHOous.—Having several to many different forms. 
PoLypet’ALous.—Having distinct, disjoined petals. 
PoLypH’yLLous.—Many-leaved. 
Potysep’ALous.—Having distinct, disjoined sepals. 
Po.ys’tAcHous.—Having many spikes. 
PoLysTEM’oNOUs.— Possessing many more stamens than petals. 
Pome.—A fleshy indehiscent fruit, two or more carpelled, with fibrous, cartilag- 
inous or stony endocarp, the chief bulk of which consists of an adherent torus. 
Pore CANALs.—Pores through much thickened, usually lignified walls. 
Pores (Pits).—Small thin spots or small holes in the cell wall. 
PREFLORA’TION.—See Aestivation. 
PREFOLIA’TION.—See Vernation. 
Prick’Le.—A sharp, rigid outgrowth from the epidermis and cortex. 
Primor’pIAL.—First formed. 
Primor’p1AL U’TrRicLe.—The outer plasma membrane. The outer layer of proto- 
plasm adjacent to the cell wall. . 
Procam’s1uM.—The first formed fibrovascular tissue of any organ before differ- 
entiation has taken place into xylem and phloem, 
Procum’sENT.—Lying flat on the ground. 
Proem’sryo.—The primary stage in the development of Chara consisting of a 
single filament and a long rhizoidal cell. The suspensor in flowering plants. 
Promyce’L1uM.—A short hyphal growth from resting spores of smuts or rusts upon 
which basidiospores are borne. 
PRosEN’cCHYMA.—Tissue composed of elongated, taper-pointed cells. 
Protan’pRous.—A condition of hermaphrodite flowers in which the stamens 
mature before the carpels. , 
Protoc’ynous.—Applied to hermaphrodite flowers in which the carpels are mature 
before the stamens. 
ProTHAt’tus (Prothal’lium).—A thalloid body bearing antheridia and archegonia, 
produced by the germination of a spore of a Pteridophyte into a protonema 
which later undergoes differentiation. 
Protone’MA.—A simple or branched green filament formed by the germination of 
a spore of a moss or fern. 
PRoToPHLO’EM.—The first-formed phloem elements in a fibrovascular bundle. 
Pro’ropLAsM.—Living matter. 
Pro’ropLast.—A term applied by Hanstein to the smallest body of protoplasm 
capable of individual action, either with or without a cell-wall, and either 
associated with other like units in a tissue or independent. 
Protoxy’LeM.—The first formed elements of xylem in a fibrovascular bundle. 
Prox’tmMAL.—Applied to the basal extremity. The attached end of an organ as 
opposed to the free or distal end. 
Pseupo.—A prefix of Greek origin indicating spurious or false. 
Pseupo-BuLB.—The fleshy bulb-like internode of an epiphytic Orchid. 
Pseu’pocarp.—A fruit which represents the product of the ripening of a single 
ovary as well as one or more accessory parts. 
. PsEUDOPAREN’CHYMA (Plectenchyma).—A tissue found in the ace: bodies of 
many fungi and consisting of compact hyphae somewhat resembling paren- 
chyma in cross section. 
PuBER’ULENT.—Covered with a fine, soft, hairy coating. 
