CL. XXIV.] CRYPTOGAMIA FERNS. 387 



leathery, oblong, deep-green. Perennial: bears fruit through the 

 greater part of the year : grows on walls and rocks : common in the 

 south of England, and in Ireland, rare in Scotland. Eng. Bot. vol. 

 xviii. pi. 1244. Scolopendrium Ceterach. Eng. Fl. vol. iv. p. 315. 



1463. 



2. POLYPO'DIUM. POLYPODY. 



Sori roundish, convex, scattered over the back of the frond, 

 in rows, between the central rib of each lobe and the margin. 

 Cover none. Capsules very numerous, globular, on hair -like 

 stalks, one-celled, two-valved, bound by a jointed ring. Seeds 

 numerous, very minute. Name from polys, many, and pous, a 

 foot. 461. 



* Frond pinnatifid. 



\ . P. vulgdre. Common Polypody. Frond deeply pinnatifid, with 



oblong, obtuse, somewhat serrate lobes; root scaly. Frond from 



six inches to a foot high, between linear and lance-shaped. Peren- 

 nial : bears fruit from May to November : grows on rocks, walls, 

 dry banks, and trunks of old trees : common. Eng. Bot. vol. xvi. 

 pi. 1149. Eng. Fl. vol. iv. p. 281. 1464. 



** Frond twice pinnatifid. 



2. P. Phegbpteris. Pale Mountain Polypody. Fronds pinnate, 

 with lance-shaped leaflets, united at the base, their segments ob- 

 tuse ; the two lowermost leaflets deflected ; veins hairy ; sori near 



the edges of the segments. Root thread- shaped, slightly scaly : 



stalk long, slender, scaly, as well as the shaft and partial stalks : 

 fronds a foot and a half high, minutely hairy, pale- green. Peren- 

 nial : bears fruit in June and July : grows in the clefts of rocks : 

 common in Scotland and Ireland, less so in England. Eng. Bot. vol. 

 xxxi. pi. 2224. Eng. Fl. vol. iii. p. 282. 1465. 



*** Fronds thrice compound. 



3. P. Dryopteris. Tender Three -branched Polypody. Fronds ter- 

 nate, each division twice pinnate, loosely spreading, the segments 

 obtuse, somewhat crenate ; root and stalk thread-shaped; sori 



scattered, separate. Fronds from six inches to a foot high, 



bright-green, smooth and delicate. Perennial : bears fruit in July : 

 ^rows in shady places : common in Scotland. Eng. Bot. vol. ix. 

 pi. 616. Eng. Fl vol. iv. p. 283. 1466. 



4. P. calcdreum. Stiff Three-branched Polypody. Fronds ternate, 

 each division twice pinnate, erect, somewhat stiff, the segments 

 obtuse, somewhat crenate; sori crowded, finally confluent. Pe- 

 rennial : bears fruit in July : grows in rocky ground : rare. About 

 Matlock-bath in Derbyshire. Eng. Bot. vol. xxii. pi. 1525. Eng. 

 Fl vol. iv. p. 283. 1467. 



3. WOO'DSIA. WOODSIA. 



Sori roundish, convex, scattered on the veins at the back of 

 the frond. Cover lying under the sorus, its margin deeply di- 

 vided into taper-pointed segments, curved over the capsules, 

 permanent. Capsules several, stalked, crowded, bound by a 

 ring, and opening irregularly at the sides. Seeds numerous, 

 kidney -shaped. Named after Mr. Woods, an English botanist. 



462. 



