236 University of California Publications. [Botany 



It has seemed best to place Saunders's form under the variety 

 opposita, as Saunders leaves it indefinite in this ease as he does 

 in the whole treatment of this species as to whether he recognizes 

 any special grouping of the forms or not. The general grouping 

 of Kuckuck and Kjellman seems to us the most convenient and 

 natural arrangement possible and to be followed as nearly as can 

 be done, with the understanding that a study of the life-history 

 may indicate that many of the forms are rather states of devel- 

 opment. Saunders's description of the form does not seem to 

 indicate much difference between this and f. rupincola Kjellman. 



Pylaiella litoralis var. opposita f. rectangulans Kuckuck. 



Floating in pools in a salt marsh. Orcas Island, Wash., 

 N.L.G., No. 627! 



Pylaiella litoralis var. firma (Agardh) Kjellman. 



On Fucus. Dutch Harbor, Amaknak Island, Bay of Unalaska, 

 Alaska, R. C. McGregor, No. 5696! ; Iliuliuk, Unalaska, Alaska, 

 W.A.S. and A.A.L., No. 3271!; Harvester Island, Uyak Bay, 

 Kadiak Island, Alaska, W.A.S. and A.A.L., No. 5103!; East 

 Sound, Orcas Island, Wash., A .L.G., No. 476! 



These forms are all lumped under the variety without attempt 

 to separate them. One or two of them probably belong to f. 

 typica Kjellman. 



Pylaiella litoralis var. firma f. macrocarpa (Foslie) Kjellman. 



On Fucus. Victoria, B. ('., Saunders (1901, p. 419).: ^^C. 



Pylaiella litoralis var. varia (Kjellman) Kuckuck. 



Common on rocks and on Fucus. Shumagin Islands, Yakutat, 

 and Juneau, Alaska, and at Victoria, B. C, Saunders (1901, p. 

 419); Port Renfrew, B. C, Tilden, No. 360! : 



Pylaiella litoralis var. varia f. densa Saunders. 



On Fucus or other alga?, occasionally upon rocks. 

 Shumagin Islands, Prince William Sound, and Sitka, Alaska, 

 and Victoria, B. C, Saunders (1901, p. 419) ; Uyak Bay, Kadiak 

 Island, Alaska, M r .J..»S'. and A. A. L.. No. 5135a!; Saunders's f. 

 detfia seems to come under the var. varia (Kjellman) Kuckuck. 



