129 

 EISENIA AKBOKEA Aeesch. 



By WrLLiAM Albert Setchell. 



History. 



In 1876, there appeared a paper in the Botaniska Notiser, 

 entitled " De Tribus Laminarieis et de Stephanocystide 

 osmundacea (Tiiru.)Trevis.,observationes praecursorias offert 

 T. E. Areschoug," which will ever be of the greatest interest 

 to the students of the algye of the Pacific Coast of North 

 America. The author, Professor Areschoug of Upsala in 

 Sweden, made known to the world two new and marvellous 

 seaweeds and advanced the knowledge of two other, until 

 that time either little known or even seriously misunderstood, 

 species from the Califoruian coasts, which had been collected 

 by his former student and Doceut in the University, Dr. 

 Gustav Eisen, then as now, of the California Academy of 

 Sciences in San Francisco. The two new Algae were Eisenia 

 arbored and Nereocfjsiis gigantea. The third member of 

 the Laminariaceee was Egregia Menziesii, for which a new 

 genus was provided and which was removed from the Fuca- 

 ceae where it had been placed in the genus Phyllospora. 



The final paper upon these species did not appear until 

 1884, when it was incorporated into the fifth part of 

 Areschoug's " Observationes Phycologicae." In this paper, is 

 given a detailed account of the adult morphology of Eisenia, 

 together with comparisons between it and some other Kelps, 

 particularly with Postelsia palmcpformis Rupr. 



DeToni (Flora, 1891) and Kjellman (in Engler and Prantl, 

 1893), have mentioned it and De Toni again in the Sylloge 

 Algarum (3; 359, 1895) has practically repeated Areschoug's 

 description but has quoted " Vera Cruz, California," instead 

 of " Santa Cruz," as Areschoug gave it. 



The writer was the first as far as he knows, to point out 

 the true relationships of the species, in his paper " On the 

 Classification and Geographical Distribution of the Lamina- 

 riacesB " (Trans. Conn. Acad., 9 ; 348, 1893). In this paper 

 were given also some hints concerning the probable develop- 



Ebythea, Vol. IV., No. 9 [1 September, 1896]. 



