48 NEW YORK STATE MUSEUM 



broken country, and the rock outcrops are all sandstone beloQg- 

 ing to the Chemung group. Yet the conditions are such as are 

 favorable to plant life and to a rich and diversified flora. A 

 few plants of the region farther north have been brought down 

 by the mighty torrent of the river, while others have slowly 

 crept up from the ocean, and have found congenial homes in the 

 alluvial soil along the river. The writer's knowledge Of x\ui> 

 flora has been acquired during his past seven years' residence in 

 Tioga county. He has gone over the entire territory and has 

 collected specimens of nearly every species and variety included 

 in this list. 



The Illustrated Flora of Britton and Brown has chiefly been 

 followed in nomenclature and in the arrangement of orders. 

 When the names of the species and varieties differ from those 

 in the sixth edition of Gray's Manual, the names in the latter 

 are given second place. 



Cordial acknowledgment of assistance in the identification of 

 critical species is hereby tendered to Professor F. Lamson Hcrib- 

 ner, Edward S. Burgess, Dr John K. Small, Dr Nathaniel i.. 

 Britton and specially to Charles H. Peck and the late Dr Thomas 

 C. Porter. They have, by their correspondence extending over 

 several years, aided and encouraged the writer in the study ol 

 the plants of this region. 



PTERIDOPHYTA 



Ferns and fern-allies 



OPHIOGLOriSACEAE 



Botrychium obliquum Muhl. 

 B. ternatum var. obliquum D.C.Eaton 



O'bliqiie grape fern 

 On knolls in old clearings and pastures. Frequent. Sep- 

 tember. 



Botrychium dissectum Spreng. 



B. ternatum var. dissectum D. C. Eaton 



Cut-leaved grape fern 

 Damp pastures. Barton. Rare. September. 



Botrychium virginianum (L.) Sw. 

 Rattlesnake fern 

 Rich moist woods. Common. August. 



