OLOSSABY. 351 



Phycoerythrine : the red pigment in some Algse (FloridecB). 



Phycology : that department of botany which treats of Algae. 



Phyooxanthine : the brownish or yellowish coloring matter in Diatoms. 



Phylhtaxy : leaf arrangement. 



Phyllame : that which in general answers to a leaf, 



PUeate : having a pileus or cap. 



Pileus : the cap or sporoearp of Toad-stools {Agaricm). 



PUeorhixa : the root-cap. 



Pihse : having soft slender hairs. 



Pinna : a primary division of a pinnat?, bipinnate leaf, etc. 



Pinnate-leaf: having the leaflets on two sides of a common petiole. 



Pinnatifid : pinnately-cleft. 



Pinnule : a division of a pinna. 



Pistil: the central organ of the flower in which (ovary) the seeds 



are produced. 

 Pistillate : having pistils, but no stamens. 



Pith: the parenchymous tissue in the centre of an exogenous stem. 

 Pitted : having pits, or depressions. 

 Placenta: the line or part of the ovary to which the seeds are 



attached. 

 Plasmodium: the naked protoplasm of the Slime Moulds (Myxo- 



mycetes). 

 Plerome : the central cylindrical mass directly behind the growing 



point and enclosed by the periblem. 

 Plewrocarpous Moss : one whose fruit is borne laterally and not from 



the apex of the stem. 

 Plieate {Plaited) : like the plaits of a fan. 

 Plumose: feathery. 



Plumule : the bud terminating the caulicle in the embryo. 

 Pod : a legume, or any kind of a capsule. 



Pollen : pollen-grains ; the powdery fertilizing grains of the anther. 

 PoUen-tvhe : the tube emitted by the pollen grain which grows down 



through the stigma and style. 

 Pollination: the conveyance of the pollen from the anther to the 



stigma. 

 Pollinia : agglutinated pollen masses. 

 Poly (as a prefix) : many (or separate, as in polypetalous). 

 Polygamous : some of the flowers perfect and some imperfect. 

 Polypetalous : of separate (distinct) petals ; petals not united. 

 PolysepaJous : of separate (not united) sepals. 

 Pome : a fleshy fruit ; like the apple, pear, etc. 

 Posterior : behind ; (in axillary flowers) next to the axis of inflores- 

 cence. 

 Prceftoration : sestivation. 

 Prosfoliation : vernation. 



Primine : the first or inner integument of the ovule. 

 PHmwdial: first. 



Primordial cdl: a naked or membraneless cell. 

 Primordial epidermis: the first fornSed epidermis over the growing 



point. 



