CL. XXIV.] CRYPTOGAMIA FERNS. 387 



long, 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. Scolopen- 

 drium 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. 



1. 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. Perennial : 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. Phegdpteris. Pale Mountain Polypody. Fronds pinnate, with 

 lance-shaped leaflets, united at the base, their segments obtuse ; the two 

 lowermost leaflets deflected ; veins hairy ; sori near the edges of the seg- 

 ments. 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. Perennial : 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. 

 *** Frond thrice compound. 



3. P. Drwpteris. Tender Three-branched Polypody. Fronds ternate, 

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

 somewhat crenate ; root and stalk thread-shaped ; sori scattered, sepa- 

 rate. Fronds from six inches to afoot high, bright-green, smooth and 



delicate. Perennial : bears fruit in July : grows in shady places : com- 

 mon 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. Perennial : bears 



fruit in July : grows in rocky ground : rare. About Matlock-bath in Der- 

 byshire. 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 divided 

 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. 



1. W. hyperborea. Ronnd-leaved Woodsia. Fronds hairy beneath, 



