332 GLOSSARY. 



Nerve, a faint vein. 



Opaque, not transparent. 



Ovate, egg-shaped, broad at one end and narrower 



at the other. 

 Ob, prefixed to a word, means the reverse form, as 



ob-ovate. 

 Patent, spreading* apart from each other. 

 Periphery, the outer layer of cells in a cylindrical 



frond. 

 Pedicel, a small stalk — usually applied to the fruit- 

 stalks. 

 Pinnae, small branchlets of an alternate or distich- 



ously branched frond. 

 Pinnule, a smaller branchlet springing* from the 



above. 

 Plumule, a feathered branchlet. 

 Process, any prominence or projecting* part, or small 



lobe. 

 Pulvinate, shaped like a cushion or pillow. 

 Punctiform, dot-like marks. 

 Pyriform, pear-shaped. 

 Radicles, small rootlets. 



