136 MIDDLESEX FLORA. 



A. ebeneum, Ait. 



Not uncommon. "Var. serratum, Gray, . . . Maiden, Nov., 



1872." G. E. Davenport, in Catalogue of the Davenport Herbarium. 

 A. thelypteroides, Michx. 



Medford (L. L. Dame) ; Melrose (F. S. Collins) ; Dracut (Dr. C. 



W. Swan) ; Groton (C. W. Jenks). Not common. 

 A. Filix-foemina, Bernh. LADY FERN. 



Common and variable ; the only form seemingly worthy a special 



recognition being the following. 

 A. Filix-foemina, Bernh., var. Michauxii, Mett. (var. angustum, 



Eaton). 



Medford and Sudbury (G. E. Davenport) ; Maiden (F. W. Morandi). 



PHEGOPTERIS, Fee. BEECH FERN. 

 P. polypodioides, F6e. 



Maiden and Melrose (F. S. Collins) ; Medford and Ashby (L. L. 



Dame); Waltham List; Somerville (E. H. Hitchings). Not 



common. 

 P. hexagonoptera, F6e. 



Medford (G. E. Davenport) ; Maiden and Melrose (F. S. Collins) ; 



Groton (C. W. Jenks). Not common. 

 P. Dryopteris, F6e. 



Arlington Heights (Wm. Boott) ; Melrose (F. W. Morandi). Very 



rare. 



ASPIDIUM, Swartz. SHIELD FERN. WOOD FERN. 



A. Noveboracense, Swartz. 



Common. 

 A. Thelypteris, Swartz. 



Common. 

 A. cristatum, Swartz. 



Rather common. 

 A. cristatum, Swartz., var. Clintonianum, Eaton. 



Maiden (F. W. Morandi) ; Arlington (Mrs. P. D. Richards). 

 A. marginale, Swartz. 



Common. 

 A. spinulosum, Swartz. 



Rather common. 

 A. spinulosum, Swartz., var. intermedium, Eaton. 



Ashby (L. L. Dame) ; Newton and Maiden (G. E. Davenport) ; 



Billerica (Dr. C. W. Swan). Not quite so common as the type. 

 A. spinulosum, Swartz., var. dilatatum, Horneman. 



Groton (C. W. Jenks) ; Maiden and Melrose (F. S. Collins). This 



variety does not in the county assume its most highly developed 



form. 



