OF THE FOBTY-NINTH PARALLEL OF LATITUDE. 17 



evident from the close affinity among those belonging to the 

 Trichostoma. 



Overlooked amongst Drummond's specimens is 



C. Canadexse. 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- 

 chcetialibus parura majoribus conformibus, tlieca in pedunculo elon- 

 gato rubro turbinata inaequali, 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 0. squarrosum, 

 (Dicranum) 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. squarrosum — the Indian C. patulum, 

 (Leptot rich urn) ^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. 



Akchidixjm, Brid. 



A. tenerrimum. Foliis lanceolatis subserratis nervo excurrente, cel- 

 lulis elongatis laxis, perichaetialibus e basi ovali subulato-lanceolatis, 

 florescentia fructuque A. phascoidis. 



Hab. Louisiana, Drummond, 2. no. 11 (as A. phascoides). 



In the decidedly excurrent 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 leaves not quite 

 half so long and more close and firm. 



Dicea>-uh, Hedw. 



D. strictum, Sckleich. 



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, 

 LI>-y. PROC— BOTANY, TOL. Till. C 



