OF THE FORTY-NINTH PARALLEL OF LATITUDE. 17 
evident from the close affinity among those belonging to the 
Trichostoma. 
Overlooked amongst Drummond’s specimens is 
C. CANADENSE. Dioicum?, caule brevi simplici, foliis e basi erecta 
subquadrata superne latiore vaginante subulato-lanceolatis divaricatis, 
nervo percurrente valido, marginibus serrulatis, cellulis basi elongatis 
inde suboblongis marginalibus brevioribus omnibus pellucidis, peri- 
chetialibus parum majoribus conformibus, theca in pedunculo elon- 
gato rubro turbinata insequali, ore magno, dentibus validis rubris di- 
cranis. 
‘Hab. British N. America (probably from the Rocky Mountains), Drum- 
mond, no. 101 part. 
In colour and appearance like a small state of C. squarrosum, 
(Dieranum) Schrad. Stems two or three lines high; seta about 
half an inch long or more. The leaves are pellucid, and differ from 
those of C. squarrosum in the more subulate narrower points and 
serrulate margins. This forms the third known species, corre- 
sponding closely with C. sguarrosum—the Indian C. patulum, 
(Leptotrichum) Mitten, having leaves of the same outline, but 
serrulate, and, so far as can be seen, it is of a smaller size. 
No species of Archidium has yet been noticed from British North 
America. Several occur in the United States, and the following 
appears to have escaped notice. 
ARCHIDIUM, Brid. 
A. TENERRIMUM. Foliis lanceolatis subserratis nervo excurrente, cel- 
lulis elongatis laxis, perichætialibus e basi ovali subulato-lanceolatis, 
florescentia fructuque A. phascoidis. 
Hab. Louisiana, Drummond, 2. no. 11 (as A. phascoides). 
In the decidedly exeurrent nerve and very lax areolation of the 
leaves this species is certainly distinct from A. phascoides, Brid. 
A. Ohioense, Sullivant, to which it is also closely allied in habit 
and general appearance as well as in the excurrent nerve, has its 
antheridia in distinct flowers, and the cells of its leayes not quite 
half so long and more close and firm. 
Dicranum, Hedw. 
* D. stricrum, Schleich. 
Hab. Fort Colville, Lyall. Gathered also in British America by 
Drummond; Lake Huron, Todd; and in the United States by Cooley, 
and near Boston, Green, It is not enumerated by Sullivant. 
D. FLAGELLARE, Hedw. 
Hab. Fort Pitt, Saskatchewan, Bourgeau. 
LINN. PROC.—-BOTANY, VOL. VIII. c 
