THE MARINE BOTANIST. 277 



C. Borreru See description. 



C affine. Shores of Bute, on fuci. Much 

 branched; two or three inches high; plumules short, 

 very narrow. Colour a deep red. This is a doubt- 

 ful species. 



(7. tripinnatum. Grows on rocks at extreme 

 low water-mark. Annual. April and May. Very 

 rare. Roundstone Bay, Galway. Plymouth. 

 Frond capillary, in habit resembling C. gracilli- 

 mum, but resembling, in its microscopic characters, 

 C. Borreri, from which it is known by the minute 

 ramulus which springs from the first joint of the 

 pinnae. Colour a fine crimson. Substance closely 

 adhering to paper. 



C gracillimum. Grows on mud-covered rocks 

 near low water-mark. Exmouth, Mrs. Gulson. Pier, 

 Torquay. Falmouth Bay. Plymouth abundantly. 

 Milford Haven. From one to four inches high, very 

 slender, distichously branched; upper plumules 

 long, narrow-ovate or lanceolate-patent, twice or 

 three times pinnate. Colour a beautiful rose-red. 



(7. thuyoideum. Grows on rocks near low water- 



