172 Mr George W. Traill on the [sess. lu. 



159. Rhodoiitela snhfusca, Ag. 



Coumiou on rocks and stones in pools between tide 

 marks. Perennial. Tetraspores in swollen nlti- 

 mate ramuli in summer, in stichidia in winter. 



160. Mhizodonium riparium, Kiitz. 



At 3, 11, &c., on rocks and Algse near high-water 

 mark. All the year (G. W. T.) ; "winter and 

 spring " (Crouan) ; " all the year " (Le Jolis). 



161. Bhizodonium Koddanuvi, Kutz. 



At 3, on iron-work (Holmes). 



162. lihodajjhyllis bifida, Ag. 



" On Algffi ; very rare " (M'Bain). 



163. Bliodymenia p)(il'>nata, Grev. 



Common on exposed rocks, and in pools between tide 

 marks; also epiphytic on A] g?e. Biennial. Granules, 

 January, February ; tetraspores, August ; tubercles, 

 June, July, August. 



164. Rivularia atra, Roth. 



At 6, 7, &c., on rocks, stones, and Algre in pools near 

 high-water mark. At all seasons. 



165. Saccorhiza hulbosa, De la Pylaie. 



Cast ashore from deep water. 



166. Sddzymenia edidis, Ag. 



At 1, 2, 8, 12, &c., on rocks near low-water mark, 

 rercrniial. Tetraspores, July, August. 



167. ^ijlutcdaria ch'rliosa, Ag. 



At 5, 7, and 12, epiphytic on Alg^e in pools at and 

 above half-tide level. All the year. Fruit in June 

 and July ; propagula in July. 



168. Sphacelaria olivacea, Dillwyn. 



At 2 and 12, in velvety patches on rocks near high- 

 water mark, accompanying Oallithamnion liothii. 

 All the year. Unilocular sporangia, pedicellate, in 

 winter. 



169. f^phacidaria jjlwnivjera (?), Holmes. 



At 12, on sand-covered rocks at low-water mark, 

 according to ProtViSsor Henderson, The plant, how- 

 ever, was not collected for examination, and as the 

 distinction between it and CloAludcphus plumosus 

 (Holmes) was not well understood at the time 

 Profes.sor Henderson saw the specimens, it may 



