THE MARINE BOTANIST. 225 



tracted as if jointed, rising from creeping fibres 

 densely matted together. Colour a very dark 

 purple, almost black when dry. Substance tender, 

 but not adhering to paper. Not uncommon. Creeps 

 over rock, in the crevices of large boulders, and on 

 woodwork near high-water mark. 



CRUORIA. 



Name meaning hlood, because the plant looks like a blood 

 stain. 



Frond between gelatine and leathery, forming a 



skin on the surface of rocks; the structure consists 



of simple-jointed filaments set in a firm gelatine; 



one of the joints of each filament is larger than the 



rest. Fructification: tetraspores lying at the 



base of the filaments. 



CRUORIA PELLITA.— SKIN-LIKE 

 CRUORIA. 



" Fronds forming smooth glossy patches of from 

 two to three or more inches in diameter, at first 



Q 



