-98- 



Androscoggin rivers. The northern section consists, for 

 the most part, of Aroostook County with an area more 

 than three-fourths as great as that of the State of Massa- 

 chusetts. 



Maine produces nearly all the common ferns and fern 

 allies of the Eastern States, but lacks a few that are 

 found on calcareous rocks in western New England. 

 Distinct and well-recognized varieties only have been 

 enumerated in connection with species, and the list, thus 

 constituted, comprises thirty-eight species and ten varie- 

 ties of ferns, and twenty-seven species and six varieties 

 of the allies, with reports, which cannot be confirmed, 

 of two or three other species. 



I wish here to acknowledge my obligations to Mr. C. 

 H. Knowlton, Mr. E. B. Chamberlain, Miss Kate Fur- 

 bish, Miss Lillian O. Eaton and numerous other corre- 

 spondents whose notes have greatly assisted me in the 

 preparation of this list of Maine ferns. Acknowledge- 

 ments are also due to Mr. M. L. Fernald of the Gray 

 Herbarium for notes and suggestions, but especially for 

 his work in connection with the genus Isoetes. This 

 portion of the list was written by him from collections by 

 himself and others in the Herbarium of the New England 

 Botanical Club, the Gray Herbarium and notes of Mr. 

 A. A. Eaton. 



. OPHIOGLOSSACE/E. 



Ophioglossum vulgatum L. Adder's-tongue. In all 

 portions of the southern section and not rare. Not 

 known in the northern section. 



Botrychium simplex Hitchcock. In various parts of 

 the State in both northern and southern sections, but 

 apparently not common. 



Botrychium matric aria folium A. Br. Matricary 

 Grape Fern. Generally distributed and not rare. 



Botrychium obliquum Muhl. Common Grape Fern. 



