Pinometer 



placentiferous 



Pinom'eter (iriVw, I drink ; (xirpov, a 

 measure), an instrument for observ- 

 ing the transpiration stream in 

 plants. 

 Pip, (1) the popular name for the 

 seeds of an apple or pear ; (2) " small 

 seeds or seed-like bodies including? 

 the bulbs of Lily of the Valley" 

 (Crozier) ; (3) a florist's term for a 

 single flower of a truss. 

 Pip'erin, the active principle of white 

 and black pepper, Piper nigrum, 

 Linn., a white crystalline body 

 isomeric with morphine ; pip'era- 

 tus, piperi'tus (Lat., peppered, 

 peppery, having a hot, biting 

 taste. 

 pisa'ceus {pisum, pea), pea-green, the 

 colour of the unripe seeds (Hayne) ; 

 ■pi' siform., pisiform' is {forma, shape), 

 pea-shaped. 

 Pis'til, Pistil'lum (Lat., a pestle), (1) 

 the female organ of a flower, con- 

 sisting when complete of ovary, style 

 and stigma ; (2) the archegonium 

 of the genus Andreaea (Hooker 

 and Taylor), and of Antlioceros 

 (Griffith); pistilla'ceous (-fACEons), 

 grooving on the pistil ; pistilla'ri- 

 bac'illar {bacillum, a staff), denotes 

 sperinatia which are oblong and 

 slightly thicker at the ends ; pis'til- 

 laxy, relating to the pistil ; '^ Cord, 

 '*a channel which passes from the 

 stigma through the style into the 

 ovary" (Lindley) ; pis'tillate, ^^/siiV- 

 la'tus, (1) having a pistil ; (2) applied 

 to a flower having pistils only, a 

 female flower ; Pistillid'ium, pi. 

 Pistillid'ia, archegouia, organs ana- 

 logous to pistils ; pistillif 'erous, -rtis 

 {fero, I bear); pistillig'erous ig'tro, 

 I bear), bearing one or more pistils ; 

 Pistillo'dy, the change of floral 

 organs into carpels ; Carpellody 

 suggested as more correct. 

 Pit, (1) a small hollow or depression, 

 as in a cell- wall; (2) the endocarp 

 of a drupe containing the kernel or 

 seed-stone (Crozier) ; ~ Cham'ber, 

 the cavity of a bordered pit on 

 each side of a closing membrane ; 

 primor'dial •^ , Sanio's term for oval 



patches in the wood of Pinus within 

 which only bordered pits arise, a 

 *' primary pit area" (Groom). 

 Pitch, a resinous exudation from the 



spruce, Picea alba, Link, etc. 

 Pitch'er, a tubular or cup-shaped 

 vessel, the terminal portion of a 

 leaf-blade, usually containing a 

 secreted digestive field; an as- 

 cidium; '- -shaped, campanulate, 

 but contracted at the orifice. 

 Pit'fall Flowers, transitional flowers, 

 such as Asarum, which detain small 

 Diptera. 

 Pith, the si)ongy centre of an exo- 

 genous stem, chiefly consisting of 

 parenchyma ; the medulla ; -^ Flecks, 

 dark marks in timber due to the 

 cavities made by the larvae of in- 

 sects in the cambium, but later 

 filled up by cellular tissue (Hartig). 

 pit'ted, marked with small depres- 

 sions, punctate ; used in a re- 

 stricted sense for pits in cell-walls ; 

 ^ Ves'sels, dotted ducts, vessels 

 with secondary thickenings leaving 

 thinner spots. 

 pitu'itOTis {pituita, phlegm), relating 



to mucus (Crozier). 



Pityria'sis {iriTvpov, scurf) versic'olor, 



a skin disease caused by Microsporon 



Furfur, Rob. 



Place-con'stant, an invariable factor 



of plant-life in a given locality; 



- -condit'ion, or -' -hab'it, the sum 



of these under varying conditions; 



/w -mode, the prevalent condition 



of size, number, colour, etc., of- 



organs of a plant in a given locality 



(ShuU). 



Placen'ta (Lat., a cake), (1) the organ 



which bears the OAoiles in an ovary, 



often the margin of the carpellary 



leaves ; (2) in Cryptogams, the 



tissue from which sporangia arise ; 



-^ -shaped, placentiform ; Placen- 



ta'rium, placenta; Pla'centaryJ, a 



placenta which is long and narrow 



and bears many ovules ; placen'tary, 



relating to the placenta; Placen- 



ta'tion, Placenta' tio, the disposition 



of the placentae ; placentif erouB 



{fero, I "bear), bearing placentae ; 



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