172 GEOLOGICAL AND NATURAL HISTORY SURVEY OF CANADA. 



west and north of Hull, Que. ; also in McKay's woods at Ottawa ; very 

 abundant on limestone ledges all around Owen Sound, Ont. (Macoun.*) 



(650.) A. heteroideus, Kindb. (n. sp.) 



Leskea nigrescens, Kindb. Bull. Torr. Bot. Club, XVL, 97 ; Canadian Musci, 



No. 395 and No. 252, in part. 

 L. nervosa var. flagellifera, Kindb. Ott. Nat. Vol. IV. 62. 



Plants densely tufted, green, finally fuscescent or blackish. Stem 

 creeping, subpinnate, much branching and furnished with numerous 

 small, flagelliform branchlets, densely beset with very small, oblong, 

 obtuse and nerveless leaves; paraphyllia broad. Stem-leaves subdistant, 

 decurrent, appressed when dry, open-erect when moist, from a broadly 

 ovate base suddenly narrowed to a long, subulate or sublinear acumen, 

 entire, faintly papillose ; margins revolute at the base ; branch-leaves 

 more attenuate ; cells round-oval, the marginal of the base quadrate ; 

 costa vanishing below the acumen. Dioecious. Fruiting specimens 

 not found. This species resembles Leskea nervosa in habit. 



On flat limestone rocks and on the roots of trees in McKay's woods, 

 Ottawa ; also on flat limestone rocks in maple woods at Owen Sound, 

 Ont. ; on rocks, " Dry Canon," discharge of Devil's Lake, Rocky 

 Mountains. (Macoun.) 



108. PLATYCYRIUM, Bruch & Schimp. 



(651.) P. repens, Bruch & Schimp. ; Lesq. & James, Mosses of N. 

 America, 307. 



P. repens var. orthodadon, Kindb. ; Canadian Musci, No. 259, in part. 

 Neckera sericea, Drumm. Muse. Bor.-Am., No. 159. 

 Pterogonium intricatum, Drumm. Muse. Bor.-Am., No. 75- 



Baie St. Paul, Charlevoix Co., Que. (St. Cyr.} Common on rotten 

 wood at London, Ont. (J. Dearness.^ On dead wood, Tobique River, 

 KB. (Hay.} Tay, York Co., N.B. (J. Moser.) On old logs, Skead's 

 Farm, Ottawa ; and on trees at Peace River, lat. 56, X.W.T. (Macoun.) 

 Rocks amongst the Rocky Mountains ; at Portage River ; Beaver 

 Lake and in Upper Canada (Ontario) upon trunks of trees and stones. 

 (Drummond.') 



Var. orthoclados, Kindb. (n. sp ?) ; Canadian Musci, No. 259, 

 in part. 



Branches elongate and not curved. All basal leaf-cells orange. Seg- 

 ments linear, not completely free at base, smooth or denticulate at one 

 side, not shorter than the teeth. 



The European species 'differs in the peristomial teeth being pale, 



