18 A Canadian Arctic Expedition, 1913-1918 



ULVACEAE. 

 Enteromorpha Harvey. 

 Enterotnorpha crinita (Roth) Agardh 



This alga was abundant in both brackish and freshwater collections from 

 Teller, and from Bernard harbour. It is really a marine species adapting itself 

 to less saline conditions. F. S. Collins^ has abeady reported this species grow- 

 ing in fresh water along with Spirogyra and Oedogonium. It is a filiform, 

 cylindrical or flattened, much branched species, the branches tapering to a 

 single series of small cells, and it is readily distinguished from E. intestinalis 

 frequently found with it in these collections. 



Enteromorpha intestinalis (L.) Greville 



This alga was exceedingly abundant at Bernard harbour, in fresh water 

 and brackish water, and at the mouth of the creek. 



PRASIOLACEAE. 

 Prasiola (Ag.) Menegh. 

 Prasiola crispa (Lightf.) Menegh. 



No collection of algae from the north or south polar regions could be com- 

 plete without this species. All stages from the H'ormidium stage to fairly large 

 fronds were found on rocks, especially where sea birds were common, at Bernard 

 harbour. Peers point (WoUaston land), and Collinson point. 



Schizogonium Kiitz. 

 Schizogonium murale Kiitz. 



This alga very closely resembles Prasiola crispa in the Hormidium stage 

 and may be a form of that species. It was found on the beach of the island 

 at Bernard harbour. 



ULOTHRICHACEAE. 



Ulothrix Kiitz. 

 Ulothrix tenerrima Kiitz. 



This alga and the next were found in the collections only as fragments- 

 It was found at Teller, in a pond on Pihumalerksiak island (Cockburn point), 

 and at Bernard harbour. 



Ulothrix variabilis Kiitz. 



This was found in material from the bottom of a tundra pond at Collinson 

 point, and at Bernard harbour, where it occurred in the brackish pond as well 

 as. in the large lake. 



MICROSPORACEAE. 



Microspora Thuret. 



Microspora stagnorum (Kiitz.) Lagerh. 



This alga was not abundant. It was found in a mud sample from the big 

 lake east of Bernard harbour, and also at Teller, where some small fragments 

 occurred in the brackish pond and the freshwater lake. 



iCollinB. The Green Algae of North America. 



