10 GEOLOGICAL AND NATURAL HISTORY SURVEY OF CANADA. 



(29.) A. alpestris, Schimp. Br. Europ. YI. t. 4. 



A. petrophila, Ehrh. var. alpestris, Thed. ; Braithw. Brit. Moss-Fl. I. 8. 



Differs from A. petrophila in the tufts being black and somewhat 

 glossy in the dry state, the leaves smaller, less distinctly papillose, when 

 dry closely imbricated, the upper leaf cells one-half smaller. 



New to America. On damp rocks, North West Arm, Halifax, N.S., 

 June 18th, 1883. (Macoun.) Christianshaab, Greenland. (Fl. #r.) 



(30.) A. Huntii, Limpr. Laubm. Deutschl. 145. 



Differs from A. crassinervis principally in the subula of the leaf, only 

 about a half formed by the costa, and the very papillose perigonial and 

 perichetial leaves, also in the larger capsule. 



This species is often confounded with A. Rothii, Web. & Mohr. On 

 rocks, Mount Arrowsmith, Vancouver Island. Alt. 5,500 feet. July 

 18th, 188T. (Macoun.*) New to America. 



(31.) A. obovata, Thed.; Greenland Flora, 399. 

 Disco Island, Greenland. (Fl. Gr.) 



(32.) A. Blyttii, Schimp.; Greenland Flora, 400. 

 Jakobshavn, Greenland. (Fl. Gr.) 



(33.) A. crassinervia, Bruch ; Lesq. & James Mosses of N. Ame- 

 rica, 26. 



Greenland. Godhavn. (Fl. Gr.) 



(34.) A. Macounii, Kindb. ; Bull. Torr. Bot. Club, April, 1890. 



Stem elongate, about 5 c. m. high. Tufts soft well cohering, dark 

 brown or brick-red, not glossy. Leaves narrow from the broader base 

 suddenly long acuminate, distinctly but faintly papillose, more or less 

 curved, the uppermost falcate, when dry subcrispate ; cells uniform 

 subquadrate ; costa narrow, linear, nearly smooth, in the upper leaves 

 long-excurrent and denticulate, sometimes to the middle. Dioecious. 



This lovely species is closely allied to the European A. nivalis, 

 Hook. ; but the leaves are narrower and very much less papillose, princi- 

 pally on the stouter, more defined, purple-red and often excurrent costa. 



In cushions and flat mats on the inclined faces of rocks on the 



