[437] THE ALG.E 2OI 



The three numbers, referred to this species somewhat tentatively, 

 represent three very variable and diverse forms which however agree 

 in structure. 



Family DELESSERIACE^Z. 

 Nitophyllum ruthenicum (Post& Rupr.) Kjellm. 1 



A single sterile specimen of this plant was collected in the sublit- 

 toral zone at Sitka (119). 



The plant is 15 cm. high bearing many cuneate branches which are 

 delicately longitudinally striate, especially near the base. It is quite 

 distinct from any of the California!! species of Nitophyllum, but is re- 

 lated to N. latissimum. The nerves are much more delicate and not 

 branched and disappearing above the middle of the lobes ; in this re- 

 spect it is intermediate between N. latissimum and N. fryeanum. 



Delesseria baerii (Post & Rupr.) J. Ag. 



Two small sterile plants of this species were collected in the sublit- 

 toral zone near Sitka (183). 



Delesseria alata (Huds.) J. Ag. 



A few sterile plants of this species were collected in Puget Sound 

 at Victoria (3). It was not seen in Alaskan waters. 



Delesseria sinuosa (Good. & Wood.) Lamon. 



Abundant in the sublittoral zone. Sitka (151); Prince William 

 Sound (265) ; Kukak Bay (344, 323) ; Shumagin Islands (371, 389). 



A very variable species, some of the forms resembling D. quercl- 

 folia but with a more distinct midrib and opposite nerves. Speci- 

 mens from Kukak Bay bore an abundance of cystocarps. The 

 species occurs in the Arctic and North Atlantic oceans and has re- 

 cently been reported by Kjellman from Bering Sea. From Sitka to 

 the Shumagin Islands it is the most common Delesseria. 



Delesseria crassifolia Rupr. 



A specimen of this plant was collected by Prof. Trevor Kincaid in 

 1898 on the shores of St. Paul Island. It was not collected by the 

 Harriman Expedition in Bering Sea. 



Delesseria decipiens J. Ag. 



In the sublittoral zone, Prince William Sound (290). 



An abundance of cystocarpic material was collected. The plants 

 are much smaller (only 8-15 cm. in length) than those from the Cali- 

 fornia coast, but agree in other respects. 



1 Kjellman, Om Behringshaf. Algfl., 25. 



