26 



THE FERN BULLETIN 



(C. deltoid ea) is described as new. The points relied 

 upon for distinguishing these forms are the number of 

 spores in the sporangia, the relative development of the 

 annulus and the amount of development of the sterile 

 leaves. The author -veil says, "a knowledge of the 

 ecology of the various forms would also assist greatly 

 in their classification." The reviewer believes that 

 such knowledge would result in putting these forms 

 back as they were before — as forms of a single 

 species. 



Minnesota is seldom regarded as a State rich in 

 ferns, but according to the "Guide to the Ferns and 

 Fern Allies of Minnesota" recently issued in Minnesota 

 Plant Studies by C. O. Rosendahl and F. K. Butters 

 there are about sixty species in the State. The Guide 

 is issued with the object of making these plants better 

 known to the residents of the State, for which purpose 

 it seems admirably designed. Although covering 

 twenty-four pages it is little more than an illustrated 

 key, but the many illustrations are so scattered through 

 the text that it wouid seem as if nobody could fail to 

 name his plants. We are inclined to think, however, 

 that residents of Minnesota will have to search a long 

 time to find Sahinia growing wild. 



There has recently come into the reviewer's hands 

 a copy of a little book on American ferns which, 

 though it bears date of 1907 and has gone into a 

 second edition, is probably not even known by name to 

 a majority of fern students. The book referred to was 

 written by Ivar Tidestrom of the Department of Agri- 

 culture, Washington, D. C., and is entitled "Elysium 

 Marianum" a name which gives the average reader 

 no clue to the contents of the book. The title recalls 



