THE ALG^ 409 



Gymnozyga (?) longata (WoUe) Nordst. 



In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 35 //. 



Family Z TGNEMA CE^E . ' 



Spirogyra varians (Hass.) Kuetz. 



In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 38-40//. 



Spirogyra porticalis (Muell.) Cleve. 

 In running water, Popof Island. 

 Diameter of the zygospores 32-42//.. 



CHLOROPHYCEiE. 



Family PLEUR O CO CCA CE^E. 

 Oocystis solitaria crassa (Wittr.) Hansgirg. 



Forming a mucous coating on damp rocks near waterfalls. Juneau 

 (75;. Identified by Setchell. 



YsimWy PROTOCOCCACE^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 HTDRODTCTIACEyE. 

 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 UL VA CE.^. 



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 Zygnenia were collected, but no fruiting material 

 was obtained. 



