vol.i] Setchell— Gardner. — Alg<e of Northice stern America. 2:j3 



Family RALFSIACE.E. 



Ralfsia verrucosa (Areschoug) J. Agardh. 



On stones in the middle and lower litoral zones. Iliuliuk, 

 Unalaska, Alaska. ir.A.is'. and A.A.L.. No. 4011!; west coast 

 of Whidbey Island, Wash., X.L.G., No. 192! 



Both the plants placed under this species are sterile, but they 

 seem otherwise to belong with this species rather than under 

 either of the following. 



Ralfsia deusta (Agardh) J. Agardh. 



On rocks and stones middle and lower litoral zones. St. 

 Lawrence Island and Port Clarence, Alaska, Kjellman (1889, 

 p. 47): near Iliuliuk, Unalaska, Alaska, W.A.S. and A.A.L., 

 No. 4059! (sterile), Postels and Buprecht (1840, p. 20, under 

 Padina deusta): Kukak Bay, Orca, and Sitka, Alaska, Saunders 

 (1901. p. 424). 



Ralfsia clavata (Carmichael) Farlow. 



On small stones in the middle litoral zone. Iliuliuk, Unalaska, 

 Alaska. W.A.S. and A.A.L., No. 4012! 



The specimens noted here have fine undocular sporangia and 

 seem to agree well with this species. 



Family LITHODERMATACE.E. 



Lithoderma fatiscens Aresehoug. 



On stones in the lower litoral and upper sublitoral zones. 

 Port Clarence, Alaska. Kjellman (1889, p. 49) ; Iliuliuk, Unalaska, 

 Alaska, W.A.S. and A.A.LI 



The specimens are all sterile but the determination seems safe. 



Lithoderma lignicola Kjellman? 



On pdes in the litoral zone. St. Michael, Alaska, W.A.S., 

 No. 5245x! 



The specimens referred here are sterile, but they agree fairly 

 well with Kjellman's description and figures (1883, p. 256, pi, 26, 

 f. 8-11). 



