46 THE MARINE BOTANIST. 



Dictyota tribe ^ in the first six the root is coated 

 with woolly fibres ; in the others it is a small naked 

 disk. 



GENERA OF THE DICTYOTA TRIBE. 



Cutleria, Frond ribless^ irregularly cleft. Sori 

 dot-like, scattered. 



JSaliseris, Frond forked, with a midrib. 



Padina. Frond fan-shaped. Sori linear, 



Zonaria. Frond lobed. Sori roundish. 



Taenia, Frond irregularly cleft; somewhat fan- 

 shaped. Sori linear. 



Dictyota, Frond linear, forked. Sori roundish. 



Stilophora, Fronds cylindrical. Spores forming* a 

 wart-like sori, 



Dictyosiphon, Fronds tubular. Spores irre- 

 gularly scattered, solitary, or in dot-like sori, 



Striaria, Spores in soriy arranged across the frond 

 in lines. 



Punctaria, Frond flat leaf-like. Spores in small 

 distinct dots. 



