FILICES. 261 



3-5 inches long, deeply pinnatifid, each of the crowded lobes 

 bearing 3-6 pairs of oblong fruit-dots. Rich woods. 



5. A. angUStifo'lium, Michx. Not evergreen. Fronds 

 simply pinnate, somewhat resembling Aspidium acrosti- 

 choides, lut very smooth and thin, and larger. Pinnae cren- 

 ulate, short-stalked. Fruit-dots linear, crowded. Rich 

 woods; not common. 



* * Indusiiim curved, delicate, often crossing the vein, thus appearing 

 reniform. 



6. A. FiliX-fce'mina, Bernh. Fronds 1-3 feet high, 

 broadly lanceolate in outline, twice- pinnate, the pinnae lanceo- 

 late in outline, and the pinnules confluent by a narrow 

 margin on the rhachis of the pinna, doubly serrate. Indu- 

 sium curved, often shaped something like a horse-shoe, 

 owing to its crossing the vein and becoming attached to both 

 sides of it. Rich woods. 



6. WOOD WARD' I A, Smith. CHAIN FERN. 



W. Virgin'iea, Smith. Fronds 2-3 feet high, pinnate ; 

 pinnae lanceolate, pinnatifid. Veins forming a single row 

 of meshes next the midrib. Wet swamps. 



T. s< OM)li;\ mtl I II, Smith. HART'S TONGUE. 

 S. VUlga're, Smith. Frond simple, bright green, a foot 

 or more in length, and an inch or more in width. Shaded 

 ravines and limestone cliffs ; not very common. 



8. CAMPTOSO'Rl'S, Link. WALKING-LEAF. 

 C. rhizophyl'lUS, Link. A curious little fern, growing in 

 tufts on shaded limestone rocks. Frond simple, with a very 

 long narrow point. not very common. 



9. PHEGOF'TERIS, F6e.* BEECH FERN. 



1. P. polypodioi'des, Fee. Fronds triangular, longer 

 than broad, 4-6 inches long, hairy on the veins, twice-pin- 

 natifid, the rhachis winged. The pinnae sessile, linear-lance- 

 olate in outline, the lowest pair deflexed and standing for- 

 wards. Fruit-dots small and all near the margin. Stipes 

 rather longer than the fronds, from a slender, creeping 



