212 THE MARINE BOTANIST. 



GYMNOGONGRUS PLICATUS.— MATTED 

 GYMNOGONGRUS. 



Fronds from four to ten inches high, wiry, very- 

 rigid and much entangled, branched, irregularly 

 forked, cylindrical throughout, the ramuli often 

 secund. Colour a very dark purple, whitish in 

 decay. Substance stiff and horny. Fructification 

 is supposed to exist in the warts which arise on the 

 stems of this plant ; but Dr. Harvey states he has 

 never succeeded in finding either spores or te ra 

 spores in them. Common on rocky sea-shores. 

 Perennial. 



POLYIDES. 



Name signifying many forms, but not well applied to this 

 genus. 



Moot an expanded disk. Frond cylindrical, 

 forked, cartilaginous, solid. Fructification : 1. 

 Naked irregular-shaped, spongy warts, composed of 

 forked filaments, through which are scattered clus- 



