Oi'd. L] CRYPTOGAMIA FILICES. 209 



477. LYCOPoDIUM. Caps, axillary, solitary, compressed. — Sub- 



ORD. LYCOPODIACE^E. 



479. PILULARIA. Common recept. of 4 cells, concealing- nume- 



rous barren and fertile Jiorets. Seeds coated. — Subord. 



MaRSILEACEjE. 



480. ISOeTES. Comm. recept. of 1 cell, within the base of the 



frond. Seeds rough. — Subord. MarsileacejE. 



CRYPTOGAMIA FILICES. 



463. POLYP6DIUM. Polypody. 



1. P. vulgare, 16. 1149. (Common P.) Frond deeply pinnatifid ; 



lobes oblong, somewhat serrated, obtuse. Root scaly. 

 Walls, & shady banks. If. . 5 — 10. Frond 9 — 12 in. Caps, crowd. 



2. P. Phegopteris, 31. 2224. (Pale Mountain P.) Frond pinnate ; 



leaflets lanceolate, united at the base, pinnatifid, with blunt seg- 

 ments ; the lowest pair deflexed. Ribs and veins hairy. Masses 

 of capsules marginal. 

 Northern mt. If. 6, 7. Fr. 1 — ^hf delicate, pale gr. Caps. fewer. 



3. P. Dryopteris, 9. 616. (Tender Three-branched P.) Frond three- 



branched ; branches doubly pinnate, spreading rather down- 

 wards ; segments obtuse, somewhat crenate. Root thread- 

 shaped. Masses of capsules scattered, distinct. 

 Shady mount, pi. If. 7. Fr. If. green, delicate. Stalk pale, brittle. 



4. P. calcdreum, 22. 1525. (Rigid Three-branched P.) Frond three- 



branched ; branches doubly pinnate, erect, rather rigid ; seg- 

 ments obtuse, somewhat crenate. Masses of capsules crowded, 

 finally confluent. 

 Limest. mount., Derby sh. l(..l. R. stouter. Fr. firmer, If. 



464. ASPlDIUM. Shield-fern. 



1. A. Lonchitis, 12. 797. (Alpine Sh.) Frond linear-lanceolate, sim- 



ply pinnate ; leaflets crescent-shaped, declining, bristly-serrated. 

 Stalks scaly. 

 Alp. rocks. If. 5, 6. A span ; harsh. Masses of caps, in the upper 

 half. 



2. A. fhelypteris, 15, 1018. (Marsh Sh.) Frond pinnate ; leaflets 



linear-lanceolate, deeply pinnatifid, smooth, somewhat crenate; 

 their lowermost segments elongated. Masses globular ; at length 

 confluent. Cover central, lax. Root trailing. 

 Boggy mead. % . 7. Fr. 1 — \\f. deep green ; stalks slender, naked. 



3. A. Oreopteris, 15. 1019. (Heath Sh.) Frond pinnate ; leaflets 



deeply pinnatifid, entire ; besprinkled underneath with resinous 



