Politropism 



Pollinarium 



circulating portion of the cyto- 

 plasm. 



Polit'ropism = POLYTROPISM. 



poli'tus (Lat. ), polished. 



pollachig'enus (iro\\axr}, often, yevvdu, 

 I bring forth) = POLYCAK,PiC. 



Pollen (Lat. fine flour), (1) the ferti- 

 lising dust-like powder produced 

 by the anthers of Phanerogams, 

 more or less globular in shape, 

 sometimes spoken of as "Micro- 

 spores"; (2) the antherozoids of 

 Mosses (Hooker and Taylor) ; 

 Carrier, the retinaculum of Ascle- 

 piads, the gland to which the 

 pollen -masses are attached, either 

 immediately or by caudicles ; <* 

 Cells, cavities of the anthers in 

 which pollen is formed ; ~ Cha'ni- 

 ber, (1) a cavity at the apex of 

 some ovules beneath the integu- 

 ments in which the pollen-grains 

 lie after pollination, as in Cycas ; 

 (2) the extine of the pollen in 

 some Coniferae dilated into two 

 hollow expansions to facilitate 

 dispersion by wind ; ~ Grain, 

 Gran'ule, the small bodies which 

 compose the entire mass ; the 

 latter term is also used for the 

 contents of the grain ; ~ Mass, 

 pollen -grains cohering by a waxy 

 texture or fine threads into a single 

 body ; ~ Sac, the micro-sporangium 

 in Phanerogams ; <~ Spore = <~ 

 GRAIN ; ~ Tet'rad, the shape of 

 certain groups consisting of four 

 grains cohering in a pyramid, as 

 in Oenothera ; ~ Tetrahed'ron = last ; 

 Tube, the tube emitted by a 

 pollen grain passing down from 

 the stigma to the ovary and 

 ovules. The various markings of 

 the pollen-grains in Acanthaceae 

 have received special names from 

 L. Radlkofer and G. Lindau, 

 which have been used in their 

 original form in the "Flora of 

 Tropical Africa " ; the following 

 account of them may be useful : 

 Dau'ben ~ (Stave ~) a modifica- 

 tion of Schalen- or Spalten ~ , with 

 broadened fissures having a stave- 



like insertion ; Do'sen <* (Box ~ ), 

 elliptic, with three longitudinal 

 stripes and a pore in each ; Facet- 

 tier'ter ~ (Facet - ), with facetted 

 surface; Fal'ten ~ (Fold <~), with 

 smooth surface and three deep 

 longitudinal grooves ; Glat'ter <~ 

 (Smooth ~ ), destitute of prominent 

 markings; Giir'tel - (Girdle ~), 

 having a zone of varied marking ; 

 Kam'mrad ~ (Cogwheel - ), having 

 regular projections on the equa- 

 torial region ; Knot'chen , an 

 abbreviation for Knotchendo'sen 

 ~ , (Nodule ~ ), having a tuberculate 

 surface ; Lin'sen ~ (Lens ~), 

 doubly convex in form ; Rah'men 

 "- (Frame ), with six small and 

 three broad streaks between the 

 poles ; Rip'pen ~ (Rib ~ ), with 

 longitudinal ribs having punctate 

 markings on them ; Run'der ~ 

 (Round ~) spherical in form <~; 

 Schalen- (Shell ~ ), with three slits 

 which do not reach the poles, and 

 without pores, the pollen-tubes 

 emerging from the slits, cf. SPAL- 

 TEN ~ ; Spal'ten - (Fissure ~), 

 with three longitudinal fissures, 

 sometimes with pores in them ; cf. 

 SCHALEN ~ ; Span'gen ~ (Clasp 

 ~), main ribs three, smaller ribs 

 six, with three pores in the equa- 

 torial region, one between each 

 two of the smaller ribs ; Sta'chel ~ 

 (Spine ^), having a spiny 

 surface, pores from three to 

 many ; Wa'ben ~ (Honey-comb 

 ^), having an areolate surface; 

 pollenate, to fertilise by pollen; 

 Pollena'tion = POLLINATION ; pol- 

 leniferous, -rns (fero, I bear), 

 pollen-bearing ; Pollenine, the con- 

 tents of pollen-grains ; Pollenold = 

 POLLINOID. 



Pollex (Lat., a thumb), an inch in 

 length, nearly 25 mm. 



pollica'ris (Lat., pertaining to a 

 thumb), an inch in length, about the 

 length of the end joint of the thumb. 



Pollina'rium, pi. Pollina'ria (Pollen, 

 fine flour), (1) = ANDBOECIUM ; (2) 

 = CYSTIDIUM. 



