184 FLORA OF MOUNT DESERT. 



Series II. CRYPTOGAMIA; FLOWERLESS PLANTS. 



Class I. PTERIDOPHYTA. 



EQUISETACE^. Hoksetail Family. 



EQUISETUM, L. Horsetail. Scouring Eush. 



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 (Band). 



FILICES. Ferns. 



POLYPODIUM, L. Polypody. 

 P. vulgare, L. 



Bocks; very common. 



PTERIS, L. Brake. 

 P. aquilina, L. 



Dry soil; very common. 



ASPLENIUM, L. Spleenwort. 

 A. Filix-foemina (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; 



