240 THE MARINE BOTANIST. 



PTILOTA PLUMOSA.— FEATHERY 

 PTILOTA. 



Fronds from three to fourteen inches high, much 

 and irregularly branched, the branches set with 

 slender opposite ramuli, fine, delicate, and feather- 

 like. The colour a dark red. Substance cartilagi- 

 nous. Grows on the stems of Laminaria digitata. 

 Perennial. Summer and Autumn. Common on 

 the shores of Scotland, and the northern and 

 western coasts of Ireland. Rare on the English 

 shores. Scarborough. Holyhead. Gwyllyn-vase 

 Bay, Falmouth, " Several fine specimens in the 

 Autumn of 1844, after rough weather;" Mr. 

 W. P. Cocks. 



PTILOTA SERICEA.— SILKY PTILOTA. 



Fronds tufted from two to six inches; this is a 

 slender and more flaccid plant than the preceding, 

 with the extreme ramuli jointed. Colour a very 

 dark or brownish red. Substance soft. Grows on 



