352 GLOSSARY. 



Primordial leaves are those of the plumule. 



Primordial utricle : the thin protoplasmic sac lining the walls of 



cells which have very much cell-sap. 

 Process; a projection. 

 Pro-embryo : the filamentous or cellular mass which sometimes grows 



directly from the spore, and from which a plant directly or 



indirectly springs. 

 Promycelium: a filamentous growth from some spores which bears 



sporidia. 

 Prosenchyma : tissue with long and pointed cells. 

 Prosenehymous : like or having prosenchyma. 

 Protandrous : same as proterandrous. 

 Proterandrous : said of flowers whose stamens precede the pistil in 



maturing. 

 Protetrandry : stamens maturing before the pistil, 

 Proterogynous : having flowers whose pistils precede the stamens iu 



maturity. 

 Proterogyny : ripening of the pistils before the stamens. 

 ProthaUium : the growth from the Fern-spore, and on which the 



organs of reproduction develop. 

 Protista: those low organisms not clearly referable either to the 



group of animals or plants. 

 Protogynous : same as proterogynous. 

 Protonema: the filamentous growth from the Moss-spore from the 



buds of which the Moss-plants develop. 

 Protophyta : the lowest division of plants. 

 Protoplasm: the nitrogenous semi-fluid mass in cells. 

 Protos (as a prefix) : first ; one ; lowest. 

 Pseudo (as a prefix) : false ; spurious. 



Pseudopodia: protrusions or branches from naked protoplasm. 

 Pteridophyia : the division which includes the Ferns and their allies. 

 Pteris : wing. 



Pubescent : hairy ; especially having soft hairs. 

 Punctate : having dots or apparent holes. 



Punctum vegetationis : the covered growing point of stem or root. 

 Pungent : terminating in a rigid sharp point. 

 Putamen : the shell of a nut ; the endooarp of a stone fruit. 

 Pyriform: pear-shaped. 



Quadra (as a prefix) : four. 



Quaternary : consisting of four elements. 



Quinque (as a prefix) : five ; as quinquefoliate, five-leaved. 



Pace: a marked "variety'' or "form" perpetuated by seed. 

 Paceme : a flower-cluster with an elongated axis bearing pedicelled 



flowers, centripetal in development. 

 Racemose: like a receme, or in racemes. 



Rachis: the axis of a spike, of a compound leaf, and the like. 

 Radiate : having rays. 

 Radical: to or from the root, or from a root-like (subterranean) 



stem ; pertaining to the root. 



