PUN 161 



PITH, 14. 



PITS, (.cypheflat.) That kind of receptacle of lirhens, which consists 

 of open, cup-like, naked, white or yellow little spots, on the under 

 side of the frond ; which is generally downv. They are at first 

 immersed, r^bose, minate do\s, which at length burst with an ir- 

 regular margin, and discharge a powder. 



PLATTED. Folded somewhat like a tan, when nearly full spread. 



PLANT. Any substance growing from seed. As trees, grass, puff-ball, 

 mould. 



PLUMOSE. Feather-like. 



PLUMOSE egret. Feather-like down. When a hair has other hairs 

 arranged on opposite sides of it. 



POD That kind ofpericarp which is composed of two valves with the 

 seeds attached to one or both sutures, or a longitudinal partivion at 

 the edges immediately adjoining the sutures. The pod is either a 

 legume or silique. 



POLLED, 11. 



POLYADELPHIA. (JPfcfos, many ; adefyhos, brother.) Many brother- 

 boods. The name of the abolished eighteenth class as first estab- 

 lished by Linneus. This class includes all plants with perfect 

 flowers, 'whose stamens are united by theii- filaments in three or. 

 m re sets, or brotherhoods. 



POLYADELPHOUS. Belonging to, or varying into, the class polyadel- 

 phia. 



PoLT&A^tiA. The name of the twenty-third class as established by 

 Linneus. It comprises all plants, which have some perfect flowers, 

 and others which are staminate and pistillate, or both kinds This 

 class is divided into three orders. 1. Jtlviieecia, having p>. .feet ff<nf- 

 ers and ei her staminate o 1 pistillate ones or both on the same plants. 

 2. JJicecia, having perfect flowers on some plants, and either st mi- 

 nate or pistillate flowers on others of the same species. 3. Tricecia, 

 having perfect flowers on some plants, staminate on others, and nis- 

 tiliate on others of the same species. This cl;-ss like the 18th, is 

 abolished by Persoon and others, and the plants under it distribtitf 

 ed anv.-ng the other classes. 



POLYGAMOUS. Va r yi> g into, or inclining to, the class pihtgamia. 



POi.YPETALOtrS, it) POLYPHYLLOUS, 9. PojffE, 1 2. PlUCKLE, 18. 



PRISMATIC. Linear with several flattish sides. A cylinder with flat 



sides. 



PROCESS. A projecting part. 

 PROCUMBENT. Lying on the ground. 

 PROLIFEROUS. Putting forth branches or flowers from ther centre of 



the top of a preceding one. 

 PROPER, 12. 



PUBKSCENT. Hairy, having hai^s, wool, dmvn. glandular hairs, Sec. 

 PUFFS, (pilidia.) That kind of receptacle of lichens, which consists 



of Irttle mund boruered knobs, whose disk finally turns to f owder. 



It is nt firs- covd'-'d with a membrane and often clo'hed wi h a fine 



grey hoariness. These recq>tacles :re elongated below into a stalk 



fix.d to the crust, but 'o..,lly diff'e.-ent from it. 

 PUNCTATE. Dotted or sprinkled with coloured, generally diaphanous, 



specks. See pcifurated. 



O 2 



