10 E Canadian Arctic Expedition, 1913-18 



Drepanocladus trifarius (Web. & Mohr.) Broth. 



From pond on Chantry island, Dolphin and Union <\ \-\\\\, Northwest Terri- 

 tories, June 17, 1916. 



Pond in swamp at Bernard harbour, Northwest Territories, June 16, 1915. 



Drepanocladus scorpioides (L.) Warnst. 



Barter island, arctic coast of Alaska, summer, 1918, J. Hadley. Pond at 

 Bernard harbour, Northwest Territories, July 3, 1916. Shore of big lake at 

 Bernard harbour, July 19, 1915. Pond at Bernard harbour, Aug. 16, 1915. 

 Attached to stones in creek-bed, Bernard harbour, Aug. 16, 1915. 



Genus Calliergon (Sull.) Kindb. 



Calliergon giganteum (Sch.) Kindb. 



Tundra at cape Bathurst, Northwest Territories, July 26, 1916. Attached 

 to stones in creek at Bernard harbour, Northwest Territories, Aug. 16, 1915. 



Calliergon sarmentosum (Wahlenb.) Kindb. 



Probably this but with more distant leaves and the leaf-cells with walls 

 thinner and less pitted than is usual. Shore of big lake at Konganevik, Camden 

 bay, Alaska, June 26, 1914. 



Genus Chrysohypnum Hampe. 



* 

 Chrysohypnum Stella turn (Schreb.) Loeske. 



From bottom of ice covered pond on tundra at Collinson point, Alaska, 

 October 9, 1913. Cliffs on "Ptarmigan creek," Sadlerochit river, Camden 

 bay, Alaska, Nov. 13, 1913. Barter island, arctic coast of Alaska, summer, 

 1918, J. Hadley. Pond on Chantry island, Northwest Territories, June 17, 

 1916. From shore of big lake at Bernard harbour, Northwest Territories, 

 July 19, 1915. 



Ghrysohypnum arcticum, n.sp. 



Flores et fructus ignoti; caulis brevis (1-2 cm.), pallide lutescens, ramis 

 paucis; folia caulina e basi appressa, concava, late ovata vel suborbicularia 

 subito in acumen reflexum producta, margine erecto vel involute, integerrimo ; 

 cellulis elongatis, pellucidis non incrassatis, latis 7-8 /*, basi majusculis, laxis 

 plus minus lutescentibus subincrassatis, alaribus varius ventricose fasciculatis. 



Chrysohypno stellato (Schreb.) Loeske proximum sed folia et cellulae latiorae. 



Sterile, no flowers found; the pale, yellowish stems without radicles and 

 with few, irregular branches, in cross-section roundish, about 175 ju in diameter, 

 with small central stand and mostly two outer layers of cells with thickened 

 walls; stem-leaves very concave, not decurrent, up to 1-4 mm. wide and 1-7-2 

 mm. long, the more or less rotund lower part appressed imbricate, with an acute, 

 widely spreading point, the margins entire all round and flat or incurved; costa 

 mostly short and double or rarely single and usually slightly forking above, 



