224 GEOLOGICAL AND NATURAL HISTORY SURVEY OF CANADA. 



(840.) H. unicostatum, C. M. &Kin(ib. (n. sp.); Canadian Musoi, 

 JSTo. 590. 



Differs from Sypnum chrysophyllum in the dense tufts, the stem more 

 irregularly branching, creeping, the leaves shorter-acuminate, the alar 

 cells smaller, not yellow, the costa more distinct, the capsule smaller, 

 the perichetial leaves gradually acuminate-subulate or filiform-pointed 

 with the acumen arcuate. 



At Canaan Forks, Queen's Co., N.B. (J. Moser.) In the Mer Bleuo 

 near Ottawa, October 4th, 1890. (Macoun.') At Cataraqui, near 

 Kingston, Ont., May 23rd, 1884. (Prof. Fowler.) 



(841.) H. decursivulum, C. M. & Kindb. (n. .sp.); Canadian 

 Musci, ^o. 514. 



H. SommerfeUii, Canadian Musci, No. 328, in part. 



Differs from Mypnum chrysophyllum in the leaves being decurrent 

 with a broader base, borders recurved at the angles ; alar cells numer- 

 ous, hyaline. Barren. 



Abundant on old logs in a boggy place under the trestle just east of 

 of Albert Canon Station, Selkirk Mountains, B.C., May 29th, 1890. 

 {Macoun.') Near New Harbor, Newfoundland. {Eev. A. Waghorne.) 



(842.) H. Columbise, Kindb. 



Amblystegiwm serpens' Columbise, Kindb. Bull. Terr. Bot. Club. XVII. 279. 



Tufts dense. Stems short, very tomentose, irregularly branching ; 

 branches short. Leaves narrower than in Mypnum chrysophyllum, from 

 the narrow-ovate base gradually tapering into the acumen ; borders 

 denticulate all around, recurved at the angles ; areolation often wide, 

 as in Amhlystegium ; costa short, reaching to the acumen or sometimes 

 longer. Capsule generally smaller and shorter than in S. chrysophyllum, 

 curved; lid short-apiculate; peristome dark-yellow, not pale ; periche- 

 tial leaves short-acuminate. 



Differs from ff. chrysophyllum in the narrower, denticulate leaves, 

 from S. hispidulum and K. SommerfeUii in the long costa. 



On wet logs near a spring about one mile from Sicamous, B.C., on 

 the road to Enderby, July 19th, 1889. {Macoun.) 



(843.) H. Macounii, Kindb. Bull. Torr. Bot. Club, XVIL, 2*79; . 

 Canadian Musci, No. 522. 



H. Halleri, Drumm. Muse. Bor.-Am., No. 191. 



Allied to Sypnum hispidulum. Habit of the European H. Halleri. 

 Monoecious. Plants small, interlaced in dense brownish-green tufts. 



