NO. 1226. NORTH AMERICAN FERNS— M AXON. 623 



1890. Catalogue of Canadian Plants. Part V. Acrogens. John Macoun. 



1890. Va.'^eular Acrogens or Pteridophytes [of the Northern Ignited States]. 1). C. 



Eaton in A. Gray, ^lanual of Botany of the N(jrthern Unite<l States ed. 6. 



675-701. 

 1895. Ferns and Evergreens of New England. Edward Knoliel. 



1895. The Pteridophyta of North America, north of Mexico. Linnaan Fern Bulle- 



tin No. 9, Willard N. Clute, editor. 



1896. The Ferns and Fern Allies of New England. Raynal Dodge. [An excellent 



descriptive work of viii + 52 pages.] 

 1896. Pteridophyta [of the Northern United States, Canada ....]. L. ]\I. Under- 

 wood in Britton and Brown, Illustrated Flora of the Northern United States, 

 . Canada .... 1 : 1-4.S. 



1896. Ferns of Iowa and their Allies. T. J. Fitzpatrick. 



1897. A Revision of the North American Species of Ophioglossum. Elizabeth G. 



Britton in Bulletin of the Torrey Botanical Club 24: 545-559. 



1898. Selaginella rupestris and its Allies. L. M. Underwood in Bulletin of tiie Tor- 



rey Botanical Club 25: 125-133. 



1898. American Ferns: I; the ternate species of Botrychium. L. ]M. Underwood in 



Bulletin of the Torrey Botanical Club 25: 521-541. 



1899. How to Know the Ferns. Frances Theodora Parsons. [An extremely i)Oj)ular 



account of the ferns of the northeastern United States; pp. 215.] 



1900. A Review of the Species of Lycopodium of North America. F. E. Lloyd and 



L. M. Underwood in Bulletin of the Torrey Botanical Club 27: 147-168. 

 1900. The Genus Isoetes in New England. A. A. Eaton in Fern wort Papers 1-16. 



The files of the Torre}" Botanical Club, especially the early volumes, 

 present an unusually large proportion of interesting short papers and 

 notes. Special mention should be given of a long series by Mr. 

 George E. Davenport, beginning in the sixth volume (1875), and 

 embracing descriptions of many new species and notes on the discov- 

 ery and distribution of many others. In the same journal Professor 

 Eaton began with the fourth volume (1873) a series entitled New and 

 Little-known Ferns of the United States, which extended to the 

 tenth volume (1883). The files of the Botanical Gazette, the Ameri- 

 can Naturalist, the American Journal of Science, and several other 

 serials are replete with references to our American species, as are 

 also in many cases the publications of the various state geological 

 surveys. The only journal devoted exclusively to the study of pteri- 

 doph3'ta is The Fern Bulletin, published in Binghamton, New York, 

 and beginning with 1901 its ninth volume. It was established in 1893 

 as the Linnajan Fern Bulletin, and from that time on has constituted 

 the official organ of the Linntean Fern Chapter, an organization of 

 fern students becoming world-wide. Descriptions of many new species 

 have appeared in this journal during the past few years. 



The greater portion of the verification of citations following has 

 been accomplished in the Library of Congress, the libraries of the 

 Smithsonian Institution and the U. S. National Museum, and in the 

 library of the Department of Agriculture. To Prof. E. L. Greene 

 the author is indebted for many courtesies, and particularly for the use 

 of his extensive library; to Mr. Willard N. Clute for the suggestion 



