THE FERNS AND FERN ALLIES OF ALASKA 



BY WILLIAM TRELEASE 



No plants attract more general attention than the ferns and 

 club-mosses, and as a rule none are earlier or more fully col- 

 lected and studied in any region, partly because of this general 

 interest and partly because identifiable fragments of most of 

 them are more easily dried and brought in than of most of the 

 higher plants, even in the absence of proper appliances for that 

 purpose. Hence the publications on this group and on the 

 Alaskan flora, though widely scattered, contain an unusually 

 full record of the Pteridophytes occurring in that region, though 

 details as to their distribution are not plentiful. 



The members of the Harriman Expedition collected a large 

 number of representatives of each of the families of Pterido- 

 phytes, their collections representing thirty-three species and 

 thirteen additional varieties. This material, as well as that 

 contained in the herbaria of the Missouri Botanical Garden and 

 the United States National Museum, has been passed in review, 

 and the results are embodied in the following catalogue, which 

 admits 74 forms, comprising 58 species and 16 additional vari- 

 eties, distributed by families as follows : Ophioglossaceas, 7 



(375) 



