MAEINE ALGiE. 



67 



1. Phyllophora rubens. 



2. ,, membranifolius. 



3. „ Brodisei. 



4. „ Palmettoides. 



LXIV. Peyssonelia. 



Frond brownish red, depressed, rooting by the under 

 surface. Tetraspores contained in superficial warts over 

 the upper surface of the frond. 



1. Peyssonelia Dubyi. 



LXV. Gymnogongeus. 



Frond cylindrical or compressed, horny, of very dense 

 structure, much branched. Tetraspores in superficial 

 warts. 



1. Gymnogongrus Grifiithsise. 



2. „ plicatus. 



LXVI. POLYIDES. 



Koot an expanded disk. Frond cylindrical, dichoto- 

 mous, cartilaginous, solid. Fructification : — 1. Oblong, 

 irregular, spongy warts ; 2. Tetraspores cruciate, im- 

 mersed in the branches. 



1. Polyides rotundus. 



f 2 



