152 GEOLOGICAL AND NATURAL HISTORY SURVEY OF CANADA. 



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



Polytrichum septentrionale, Drumiii. Muse. Bor.-Am., No. 283. 



Summit of Eocky 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. Lawrence, St. Paul and St. George islands, Behring Sea. 

 1891. (J. M. Macoun.) 



Yar. brevifolium, Brid. 



On rocks, Digge'p Island, f^^Hudson Strait. {R. Bell.) Greenland. 

 (^Fl ar.) 



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



Differs in the leaves being nearly entire or indistinctly denticulate. 

 St. Paul Island, Behring Sea, 1891. (J. M. Macmm.) 



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

 dian Musci, No. 546. 



Dioecious ; laxly csespitose, 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, lineai'-lanceolate ; cuspidate from the 

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

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

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

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

 walls often oblique and iri-egular. Perichetial leaves shorter and 

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

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

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

 mouth, constricted, not angulose, finally dark-brown, at first greenish 

 with the mouth oi'ange, 6-7 mm. long and' 2 mm. bi-oad ; 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 

 Folytrichum grandifolium, Lindb. 



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

 at Eevelstoke 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.) 



