184 FLORA OF MOUNT DESERT. 



SERIES II. CRYPTOGAMIA; FLOWERLESS PLANTS. 



CLASS I. PTERIDOPHYTA. 

 EQUISETACE^S. HORSETAIL FAMILY. 



EQUISETUM, L. HORSETAIL. SCOURING RUSH. 



E. arvense, L. COMMON HORSETAIL. 



Moist gravelly soil; common. 

 E. sylvaticum, L. 



Wet banks and shady places; frequent. 

 E. limosum, L. 



Borders of ponds; rare. Bubble Pond (F. M. Day, Redfield) ; 

 Great Pond (Rand). 



FILICES. FERNS. 



POLYPODIUM, L. POLYPODY. 

 P. vulgare, L. 



Rocks; very common. 



PTEEIS, L. BRAKE. 

 P. aqnilina, L. 



Dry soil ; very common. 



ASPLENIUM, L. SPLEENWORT. 



A. Filix-foBmina (L.), Bernh. LADY FERN. 



Damp shady places; frequent, and very variable. 



Var. angustatum (Willd.), D. C. Eaton. Var. Michauxii, 



Mett. 



Fronds l-3 high, rather rigid, narrow in outline, nearly 

 bipinnate; pinnse obliquely ascending or curved upwards, nar- 

 rowly lanceolate ; segments oblong, crowded, crenated or serrate; 



