Ceramiea.l callithamnion. 179 



This is a fine, recl_, loosely-branching plant_, got only in 

 the north of Scotland and in Norway. It was at first named 

 in this country C. Follexfemi, in honour of the Eev. Mr. 

 Pollexfen, who found it in Orkney; but it was afterwards 

 discovered that it had been named C. floccosum by Agardh. 

 It has been gathered at Aberdeen by Dr. Dickie, to whose 

 kindness I am indebted for some fine specimens. 



9. Callithamnion Tuhneri, Agardh, 

 Hab. Parasitical on several marine Algse. 



Very large tufts of it are common in the island of Arran, 

 on Furcellaria fastigiata. It was named C. Turneri, in 

 honour of Mr. D. Turner, the author of ' Historia Tucorum,^ 

 by whom it was discovered. The fructification approaches to 

 that of Griffithsia. C. repens is a variety of this plant. 



10. Callithamnion pluma, Agardh. 



Hab. Generally on the stems of Laminaria digitata. 

 Bantry Bay, Miss Hutchins ; Appin, Captain Carmichael ; 

 Miltown Malbay, Professor Harvey. 



A small plant, from a quarter to half an inch in height. 

 A fine rose-red. It is rare. I have never seen it. 



11. Callithamnion baebatum, /. Agardh. 



Hab. On mud-covered rocks. Perennial and very rare. 

 A small tufted plant, found in Britain only by Mr. Ealfs 

 and Eev. Mr. Berkeley. 



