242 GEOLOGICAL AND NATURAL HISTORY SURVEY OF CANADA. 



Mountains, B.C. (Macoun.") In rivulets, immediately to the westward 

 of the "Height of Land," Rocky Mountains. (Drummond.') Green- 

 land. (Fl. 



(901.) H. pseudo-arcticum, Kindb., Bull. Torn Bot. Club, XVII, 

 280. 



Differs from H. arcticum in the leaves being crenulate at least above 

 the middle ; costa short and double, not reaching to the middle ; peri- 

 chetial leaves short-acuminate, serrulate. Peristomial segments rimose 

 in the middle. Stem sparingly radiculose. 



On stones in mountain brooks near Sicamous ; and in brooks on the 

 Gold Range, north of Griffin Lake, B.C.. July 9th, 1889. (Macoun.) 



(902.) H. Norvegicum, Bruch & Schimp., Bryol. Europ. VI. 



Greenland. (Fl r.) 

 (903.) H. polare, Lindb. 



Greenland. (Fl. tfr.) 



(904.) H. circulifolium, C. M. & Kindb. (n. sp.) 



Nearly allied to Hypnum dilatatum, Wils. (H. molle, Lesq. & James). 

 Stem loosely foliate, denudate at the base. Leaves patent, when dry 

 subcircular, faintly crenulate nearly all around, slightly decurrent, at 

 the cordate base distinctly auriculate and in the middle carinate, nar- 

 rowed above to an indistinct obtuse tip ; alar cells large, innate, sub- 

 oval, the apical also short, the other narrow and flexuous ; costa none 

 or indistinct. Barren. 



On rocks, Never' s Rapids, Queen's Co., N.B., July, 1889. (J. Moser.) 



(905.) H. arcticum, Sommerf. ; Lesq. & James, Mosses of N. 

 America, 400 ; Canadian Musci, No. 358. 



On stones in Fox River and St. Anne des Monts River, Gaspe Co., 

 Que. ; on rocks along Lake Nepigon, Ont. ; on stones in brooks, Roger's 

 Pass, Selkirk Mountains, B.C. ; also along the Quesnel River, Quesnel, 

 B.C. (Macoun.) Rocky Mountains. (Lyall.} Greenland. (Fl. GHr.) 



(906.) H. Coulardi, Schimp. 



On stones in Ste. Anne des Monts River, Gasp Co., Que.; and along 

 Gunn River, Anticosti. (Macoun.) 



