208 GEOLOGICAL SURVEY OF CANADA. 



On a large rock in a ravine at North Wakefield, Que., Sept. 

 I2th, 1893. (/. M. Macoun.) On rocks at Owen Sound and 

 Wiarton, Bruce Co., Ont., July, 1874. {Macoun.) 



36. LEPTODONTIUM, Hampe, 



165 L. Canadensis, Kindb. 



In the Bryineae of North America and Europe Dr. Kindberg 

 re-describes this species and names it Didymodofi Macounii, Kindb. 



Mrs. E. G. Britton in Bull. Torr. Bot. Club, Vol. XXVII., 

 p. 648, shows that this species is identical with Pottta riparius, 

 Aust. and Trichostomum Warn torfii^ Correns, while Dr. Kind- 

 berg brings them also together but makes two species out of 

 the three keeping Pottia riparitis^ Aust. and Trichostomum Wam- 

 storfli, Correns, under Didymodon riparius, Aust. 



37. DITRICHUM, Timm. 



LEPTOTRICHUM, Hampe. 



991. D. oblongiini,(LiNDB.) Kindb. 

 On earth, Greenland. {Berggrefi.) 



992. D. giganteum, R. S. Williams. 



The author compares this species with large forms of D. 

 flexicmde which approach it very closely. Sterile specimens, only, 

 collected at Dawson, Yukon, 1899. {Williams^ Specimens of 

 this species were collected by the "torrent" at Hector, Rocky 

 Mountains, July 29th, 1885, and again on August 12th, 1890. 

 These were referred to flexicaule in Part VI., Cat. Can. Musci., 

 p. 46. {Macoun.) 



166. D. tortile (Gmel.) Lindb. 



On earth, Aroostook Falls, New Brunswick, Sept. 7th, 1899 ; 

 on earth at South Indian, Carleton Place, Algonquin Park and 

 Ottawa, Ont. {Macoun.) 



Subsp. pusillum, Hedw. 



Drummond's No. 118 and Prof. Fowler's specimen from New 

 Brunswick referred to tortile in Cat. Can. Musci 45 belong here. 

 Rather common by the roadside near the Mer Bleue, and at 

 Rockcliffe, Ottawa, Ont. {Macoun.) 



