[409] THE ALG^ 173 



Gymnozyga (?) longata (Wolle) Nordst. 



In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 35 ij.. 



Family ZYGNEMACEy^} 



Spirogyra varians (Hass.) Kuetz. 



In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 38-40 ix. 



Spirogyra porticalis (Muell.) Cleve. 

 In running water, Popof Island. 

 Diameter of the zygospores 32-42 /z. 



CHLOROPHYCEiE. 



Family PLE UR O CO CCA CE^E. 

 Oocystis solitaria crassa (Wittr.) Hansgirg. 



Forming a mucous coating on damp rocks near waterfalls. Juneau 

 (75). Identified by Setchell. 



Family PR O TO CO CCA CE^E. 



Sphaerella lacustris (Girod.) Wittr. 



On snow near Yakutat Bay, June 23. 



This is the so-called " red snow" found in standing rain water and 

 on snow throughout Europe and North America. It was also ob- 

 served by members of the party on Muir Glacier and on snow above 

 Orca, Prince William Sound. 



Family HTDR OD YCTIA CE^E . 

 Pediastrum boryanum (Turp.) Menegh. 

 In freshwater, Popof Island. 



Pediastrum angulosum (Ehrenb.) Menegh. 

 Abundant in a freshwater pond, Popof Island. 

 The plant is discoidal, 32-celled, the cells all angled. 



Family C/L VA CE^E. 

 Monostroma fuscum (Post & Rupr.) Wittr. 



On rocks, Muir Inlet, Glacier Bay (105) ; Sitka (144) ; Virgin 

 Bay, Prince William Sound (277) ; Kukak Bay (315) ; Lowe Inlet 

 (16). 



^ Several sterile specimens of Zygnema were collected, but no fruiting material 

 was obtained. 



