224 GEOLOGICAL AND NATURAL HISTORY SURVEY OF CANADA. 



(840.) H. unicostatum, C. M. &Kindb. (n. sp.)j Canadian Musci 7 

 No. 590. 



Differs from Hypnum 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 Bleue 

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

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



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

 Musci, No. 514. 



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



Differs from Hypnum 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. (Rev. A, Waghorne.} 



(842.) H. Columbia;, Kindb. 



Amblystegium serpent Columbia?, Kindb. Bull. Torr. Bot. Club. XVII- 279, 



Tufts dense. Stems short, very tomentose, irregularly branching - t 

 branches short. Leaves narrower than in Hypnum chrysophyllum, from 

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

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

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

 longer. Capsule generally smaller and shorter than in H. chrysophyllum t 

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

 tial leaves short-acuminate. 



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

 from H. hispidulum and H. Sommerfeltii 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, XVII., 279*; 

 Canadian Musci, No. 522. 



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



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

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



