44 MR. W. MITTEN—BRYOLOGIA OF THE SURVEY 
FONTINALACEA, Schimp. 
DICHELYMA, Myrin. 
D. uNCINATUM, sp. nov. Foliis tristichis falcatis secundis lanceolatis 
sensim longe tenuiter angustatis complicatis nervo excurrente apice 
dentieulato marginibus e medio ad apicem minute serrulatis, cellulis 
elongatis angustis, perichetialibus convolutis externis oblongis obtusis 
internis elongatis acutioribus, theca in pedunculo brevi exserta ovali 
interdum inzequali, 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 perichetial 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. 
FoxrISAuIS, Dill. 
F, AN TIPYRETICA, Linn. 
Hab. On stones in the river, Fort Colville, British Columbia, Lyall. 
Appears to be identical with the European species. 
F. savAMOSA, Linn. 
Hab. Saskatchewan, Bourgeau. 
Lrskza, Hedw. 
(Leskea.) 
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) Virginianum, Brid. 
L. ABIETINA ( Linn.). 
Hab, Lake Winnipeg, Bourgeau. 
L. BLannovıuı (Web. et Mohr). 
Hab. Fort Colville, Lyall. 
