THE FERX BULLETIN 



19 



specimens showing the extent of variation of every 

 sort and then publish the results. To take a specific 

 case: Anchistea Virginica usually has a row of sori 

 next the costa of the pinnae and also along the mid- 

 veins of the segments. But in just one specimen that I 

 have seen (from Xew York) there are in addition 

 some rather irregular placed and somewhat abortive 

 sori on the lateral veins of the segments. I dare say 

 any member of the Society who sat down in a good 

 clump of this fern would find similar specimens by 

 looking long enough and also other peculiarities. " 

 After the Society has thoroughly worked up notes like 

 the above they might form the basis for a series of 

 small monographs. 



INDEX TO RECENT LITERATURE. 



Readers are requested to call our attention to any 



errors in, or omissions from, this list. 



Benedict, R. C. Studies of the Ophioglossaceae, — 

 III. Torreya, O. 1909.— Key to the "group of B. 

 ternaium" with observations on the forms. 



Benedict, R. C. The Genus Ceratopteris; A Prelim- 

 inary Revision, illust. Torrey Bulletin Ag. 1909. — 

 Three previously named forms raised to specific 

 rank and another described as new. 



Chester, L. E. Shelter Island Ferns. Fern Bulletin 

 O. 1909. 



Clute, W. N. Rare Forms of Ferns, — XII. Poly- 

 stichum aerostiehoides multifidum, illust. Fern Bul- 

 letin O. 1909. 



Druery, C. T. Tree Ferns. Fern Bulletin O. 1909. 



— Note regarding thorns. 

 Foster, A. S. Fetus of Paradise Park. Muhlen- 



bergia. O. 1909. — A list of seven species collected 



in Mt. Ranier National Park. 



