4 E Canadian Arctic Expedition, 1913-18 



Genus Ditrichum Timm. 



Ditrichum flexicaule var. densum Braithw. 



Near Colville hills, Victoria island, Northwest Territories, July, 1915, D. 

 Jenness. Tundra at Bernard harbour, Northwest Territories, June, 1916. 



Ditrichum giganteum R. S. Will. 



Port Epworth, Coronation gulf, Northwest Territories, June, 1915, J. R- 

 Cox and J. J. O'Neill. 



Family DICRANACEAE. 

 Genus Dicranum Hedw. 



Dicranum Bergeri Blandow. 



On lower hills of Sadlerochit' river, 25 miles inland from Camden bay, 

 Alaska, Nov. 13, 1913. 



Dicranum elongatum Schleich. 



Tundra hummock at Collinson point, Alaska, June 7, 1914. 



Dicranum neglectum Juratzka. 



Tundra at Collinson point, Alaska, June 7, 1914. Tundra at Collinson 

 point, Alaska, Oct. 9, 1913. Basalt island southeast of Lady Franklin point, 

 Coronation gulf, Northwest Territories, March 12, 1916. 



Family POTTIACEAE. 

 Genus Tortella (C.M.) Limpr. 



Tortella tortuosa (L.) Limpr. 



Moist places on basalt island southeast of Lady Franklin point, Coronation 

 gulf, Northwest Territories, March 12, 1916. 



Tortella fragilis (Drumm.) Limpr. 



Port Epworth, Coronation gulf, Northwest Territories, June, 1915, J. R. 

 Cox and J. J. O'Neill. 



Genus Didymodon Hedw. 

 Didymodon rubellus (Hoffm.) Br. & Sch. 



Young point, Northwest Territories July 21st, 1916. On dolomite rocks 

 on Sutton island, Dolphin and Union strait, Northwest Territories, April 10, 

 1916. 



Genus Barbula Hedw. 

 Barbula Johansenii, n.sp. 



Dioica; humillima (3-4 mm.); caules simplices, cespitosi, virides; folia siccata 

 erecto-appressa, imbricata, ovato-lanceolata, non papillosa, 1-5 mm. longa, 

 margine integro, plus minus revoluto; cellulis inferioribus oblongis vel 



