Ceramiece.'] c a llith amnion. 175 



1. Callithamnion plumula, Lynghye. FeatJiery Calli- 

 thamnion. 



Hab. In the sea^ on every shore of Great Britain and 

 Ireland^ and yet far from being common on many shores. 



It was first figured by Ellis more than eighty years ago_, 

 and then it does not seem to have been again observed till 

 it was figured and described by Dillwyn^ who got it at 

 Swansea in 1802. His figure of it is good, but the colour 

 is not sufficiently lively. It seems a deep-water plant, being 

 got by dredging off the coast of Ayrshire and Arran. It is 

 floated out in fruit in summer, and also so late as September. 

 It is a captivating little Alga, the colour being a fine rosy- 

 red, and the branches being beautifully pectinated, giving 

 it a very feathery appearance. The capsules are small^ but 

 it is often dotted with large dark red favellae. 



2. Callithamnion cruciatum, Agardli. 



Hab. Mud-covered rocks in the sea; rare. In England 

 by Mrs. Griffiths, Mrs. Wyatt, Mr. Ealfs, Eev. Mr. Hore, 

 Mrs. Gulson, Dr. Cocks ; in Ireland by Dr. J. R. Harvey, 

 Mr. W. Thompson, Mr. Andrews ; and var. /3 by Professor 

 Harvey at Miltown Malbay. Not got in Scotland. 



It is a lovely plant, as may be seen by glancing at Plate 

 CLXiv. in ^ Phycologia Britannica.^ It is easy to distinguish 



