44 Mil. W. MITTEN — BItYOLOGIA OF THE BtTBVEt 



EONTENAJLACE^, Schktp. 



Dichelyma, Myrin. 



D. uncinatum, sp. nov. Foliis tristichis falcatis secundis lanceolatis 

 sensim longe tenuiter angustatis complicatis nervo excurreute apice 

 denticulato marginibus e medio ad apicem minute serrulatis, cellulis 

 elongatis angustis, perichsetialibus convolutis externis oblongis obtusis 

 internis elongatis acutioribus, theca in pedunculo brevi exserta ovali 

 interdum inaequali, operculo subulato subaequilongo, peristomio in- 

 terno toto cancellato externo paulo longiore, habitu D.falcati. 



Hab. Fort Colville, British Columbia, Lyall. 



Rather more slender than D. falcatum, Myrin, and its stems 

 more subpinnate ; its leaves more setaceous from the excurrent 

 nerve, which is smooth beyond the serrulate margins and denti- 

 culate only at its apex. The perichsetial leaves are not twisted ; 

 and the internal peristome, which resembles a perfect cancellate 

 cone, only exceeds the external teeth by about one-fifth of their 

 length. 



Male plants of D.falcatum have sometimes leaves with narrow 

 points, but it is difficult to see if the nerve is continued into 

 them, or if they are merely a prolongation beyond it, as is com- 

 mon in many mosses. The calyptra is not adherent by its base in 

 any of the specimens of D. uncinatum. 



Eonttnalis, Dill. 

 F. antipyretica, Linn. 



Hab. On stones in the river, Fort Colville, British Columbia, Lyall. 

 Appears to be identical with the European species. 



F. squamosa, Linn. 



Hab. Saskatchewan, Bourgeau. 



Leskea, Hedw. 



(ZesJcea.) 

 L. polycarpa, Ehrh. 

 Hab. British Columbia, Pend Oreille River, Lyall. 



(Thuidium, Schimp.) 

 L. gracilis, B. et S. 

 Hab. Saskatchewan, Bourgeau. 

 This is probably Hypnum (Stereodon) Viryinianum, Brid. 



L. abietina (Linn.). 



Hab. Lake Winnipeg, Bourgeau. 



L. Blandovii (Web. et Mohr). 

 Hab. Fort Colville, Lyall. 



