152 GEOLOGICAL AND NATURAL HISTORY SURVEY OF CANADA. 



Var. septentrionale, Brid. ; Canadian Musci, No. 427. 



Polytrichum septentrUmale, Drumm. Muse. Bor.-Am., Na 283. 



Sammit of Rocky Mountains. {Drummond.) Abundant on the 

 summit of Copper Mountain, on the south side of the Bow River 

 valley, at Castle Mountain, Rocky Mountains. (Macoun.) Greenland. 

 (Fl. Gr.) St. Lawi'ence, St. Paul and St. George islands, Behring Sea. 

 1891. (J. M. Macoun.) 



Var. brevifolium, Brid. 



On rocks, Digge's Island, iHudson Strait. (E. Bell.) Greenland. 

 {Fl. Gr.) 



Var. microdontium, Kindb., Ott. Nat. Vol. V. 



DiflFers in the leaves being nearly entire or indistinctly denticulate. 

 St. Paul Island, Behring Sea, 1891. («/ M. Macoun.) 



(583.) P. Macounii, Kindb., Bull. Torr. Bot. Club, XVI. 96; Cana- 

 dian Musci, No. 546. 



Dioecious ; laxly ccespitose, green, brownish when old. Stem rooting 

 only at base, ascending 8-15 cm. high, dichotomous branching. Leaves 

 very long (1.5-2 cm.); when dry, spreading or patulose, flexuose and 

 convolute ; when humid, subplane, linear-lanceolate; cuspidate from the 

 short, sheathing, dirty-white base, densely and sharply serrate, spinulose 

 and reddish at back towards the apex ; lamellffi numerous (about 60), 

 entire, each of round hexangular cells, costa long-excunent ; lower 

 cells of the leaf-base elongate and naiTOW, the upper oblong, the cell- 

 walls often oblique and irregular. Perichetial leaves shorter and 

 more acute than the other ; seta robust, 3-6 cm. long, pale, finally 

 orange. Vaginule glabrate, pale ; capsule 6 ram. long, obliquely in- 

 clined, cylindric-oblong without neck at the base, narrowed below the 

 mouth, constricted, noi angulose, finally dark-brown, at first greenish 

 with the mouth orange, 6-7 mm. long and 2 mm. broad ; lid large 

 conic-subulate, at base orange, 2 cm. long ; teeth of peristome 32, short. 



This robust and very distinct species is allied to the Japonian 

 Polytrichum grandifolium, Lindb. 



On rocks and earth in Roger's Pass, Selkirk Mountains ; on rocks 

 at Revelstoke on the Columbia and on earth at Hastings, Burrard 

 Inlet, B.C. ; on the slopes of Mount Arrowsmith, Vancouver Island. 

 (Macoun.) On rocks, Alert Bay, Vancouver Island. (Dawson.) 

 Prince of Wales Island, Alaska, 1891. (J.M. Macoun.) 



