184 FLORA OF MOUNT DESERT. SERIES II. CRYPTOGRAMIA; FLOWERLESS PLANTS. CLASS I. PTERIDOPHYTA. EQUISETACEÆ. HORSETAIL FAMILY. EQUISETUM, L. HORSETAIL. SCOURING RUSH. 766 E. arvense, L. COMMON HORSETAIL. C. XC. S GR. Bic. J. Cal. Da R. Moist gravelly soil; common. LC. BR. Pace'D. AC RSA-T 767 E. sylvaticum, L. Da R. J. Cal. D. Wet banks and shady places; frequent. C. PD. RSA- 768 E. limosum, L. CB(m) Da R. GR. XC. BR. D. Borders of ponds; rare. Bubble Pond (F. M. Day, Redfield); c. xc. — Great Pond (Rand). FILICES. FERNS. POLYPODIUM, L. POLYPODY. 769 P. vulgare, L. R Blanca qc. Pea T ma. C. Q. DH. GR. Bic. Trac MR. T Rocks; very common. PTERIS, L. BRAKE. Bic Da-BB 770 P. aquilina, L. C. XC. S. J. Cal. XC. GR. GA. D. Dry soil; very common. ASPLENIUM, L. SPLEENWORT. 771 A. Filix-fœmina (L.), Bernh. Lady Fern. ma- T qc T Damp shady places; frequent, and very variable. C. B. S. Bic Cal. XC. Var. angustatum (Willd.), D. C. Eaton. Var. Michauxii, 772 Mett. Fronds 1°–3° high, rather rigid, narrow in outline, nearly bipinnate; pinnae obliquely ascending or curved upwards, nar- rowly lanceolate ; segments oblong, crowded, crenated or serrate;