THE MARINE BOTANIST. 107 



tata. Perennial. Summer. Common on the Scotch 

 shores, and on the north of England and Ireland. 

 Remarkably fine at Bangor, Co. Down. 



RHODOMELA SUBFUSCA.— PURPLISH- 

 BROWN RHODOMELA. 



Fronds as in the preceding species, clothed with 

 numerous ramuli during summer ) set with alternate 

 branchlets, often crowded towards the end of the 

 branches. Stem, four to ten inches high; branches 

 virgate very variable in ramification. Colour, a red- 

 dish brown, not unlike that oi Ilypnea purpurascens 

 when recent, but becoming much darker in drying. 

 Grows on rocks and algae. Perennial. Summer. 

 Frequent. 



BOSTRYCHIA. 



Name from a ringlet or curl of hair. 



Frond dull, purple, filiform, much branched, in- 

 articulate, dotted. Cells of the outer surface of the 



