BRITISH MARINE ALGJE . 



113 



Polysiphonia Brodiaei. Throughout the year. On 

 rocks, and the larger Algae, between tide-marks. 

 Common. 



Polysiphonia byssoides. Spring and summer. Mount 

 Edgecumbe ; Beggar's Island ; Plymouth. Ayr- 

 shire. Bantry. 



Polysiphonia Carmichaeliana. Spring. Parasitical on 

 Desmarestia aculeata. Appin. 



Polysiphonia elongata. Spring and summer. Redding 

 Point; Bovisand; Torquay; Exmouth; &c. Com- 

 mon. 



Polysiphonia elongella. Summer. Redding Point ; 



Whitsand Bay ; Torquay. 

 Polysiphonia fastigiata. Spring and summer. Grow- 

 ing on Fucus nodosus and others. Abundant. 

 Polysiphonia fibrata. Summer and autumn. Growing 



on Fuci. Whitsand Bay ; Bovisand. 

 Polysiphonia fibrillosa. Summer. With the preceding. 

 Polysiphonia formosa. Autumn. Torpoint ; Mount 



Edgecumbe ; Torquay. 

 Polysiphonia furcellata. Summer. Sidmouth; dredged 



in Torbay. Carrickfergus. 

 Polysiphonia Grevillii. Summer. On the larger Algae. 



Shores of Bute. 

 Polysiphonia Griffithsiana. Summer. Parasitical on 



Polyides rotundus. Torquay ; Isle of Portland. 



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