312 Mr Traill im Xew and Rare Marine Algce. [sess. lu. 



JVotcs on Ncvj and Rare Marine Algm, fjathercd in 1887. 

 By Geoege Wm. Traill."" 



(Read 8th March 1SS8.) 



1. Chcctoraorpha cannahina, Arescli. Identified by Pro- 

 fessor Kjellman, of Upsala. New to Britain. July 1887. 



Though C. cannahina is generally considered to be a fresh- 

 water species (vide Crouan, Floride du Finidrrre, p. 125, 

 &c.), this habitat — the " Peerie Sea," Kirkwall — is salt 

 water. It should be mentioned, however, that the " Peerie 

 Sea " was formerly a fresh-water lake, separated from 

 Kirkwall Bay by a narrow neck of land ; and that, many 

 years ago, in consequence of an attempt to drain it, the sea 

 broke through, and has ever since regularly ebbed and 

 flowed there. 



2. Rliodomela lycopodioides (L.), Ag. A^'ariety ^ laxa, 

 Kjellman. This is identified by Professor Kjellman as 

 his variety ^ laxa, which is new to Britain. I found it in 

 pools at the Bay of Carness, due south from Hellyar Holm, 

 Orkney, July 1887. It occurred sparingly. 



3. Vaucheria spJucrospora, Nordst. 



Forrtia genuina, Nord., and 



Forma dioica, Nord. 

 1 forwarded these to Professor Nordstedt of Lund, who is 

 the chief authority on this genus, and they were identified 

 by him. He saw antheridia in connection with the 

 oogonium ; also singUi ougonia. Kirkwall and Scappa Bays, 

 on mud covered by the sea at high tides only. July 

 1887.t 



4. C'allibUpharis jubala (Huds.). Extremely narrow form, 

 Jide Kjellman. Dredged in Kirkwall Bay, 6 fathoms. July 



1887. 



5. Folysiphonia roseola (Ag.), Arcscli. IdenLilied by 

 Kjellman as young plants of F. roseola, and proliably new tf) 

 Biitain. (.'rcjuan makes it a variety of Folysiphonia urceo- 



* Mr Traill exhibited herbaiiuiii ami microscopic specimeiis ilhi.strative of 

 his communication. 



+ [Since the above was written I liavi- found tliis species at several places on 

 the Dunbar coast in similar habitats. There were also ougonia and antheridia 

 to;,'etlier. IGth August 1888.] 



