CL. XXIV.] CBYPTOGAMIA. FERNS. 391 



and Perth. Fronds having the above characters sometimes grow 

 from the same root with others having the characters of A. Ruta- 

 muraria. Eng. Bot. vol. xxxii. pi. 2258. Eng. Fl. vol. iv. p. 309. 



1486. 



6. A. septentriondle. Forked Spleenwort. Fronds two or three- 

 cleft ; segments linear, pointed and jagged at the summit. 



Fronds in a dense tuft, erect, consisting of a thread-shaped stalk, 

 divided at the top into two or three narrow segments. Perennial : 

 bears fruit from June to October : grows on rocks in Scotland, 

 Wales, and north of England. Eng. Bot. vol. xv. pi. 1017. Eng. 

 Fl. vol. iv. p. 308. 1487. 



7. A. Adidntum-nigrum. Black Maidenhair Spleenwort. Frond 

 between lance-shaped and triangular, alternately thrice pinnate ; 



leaflets lance-shaped, pointed, deeply serrate. Fronds about a 



foot high : stalks scaly at the base, dark-brown, shining. Peren- 

 nial : bears fruit from June to October : grows on rocks, walls, 

 and shady banks : common. Eng. Bot. vol. xxviii. pi. 1950. Eng. 

 Fl. vol. iv. p. 310. 1488. 



8. A. lanceoldtum. Green Lance-shaped Spleenwort. Frond lance- 

 shaped, twice pinnate ; leaflets and segments deeply toothed. 



Fronds six or eight inches high : stalks brown at the base. Peren- 

 nial : bears fruit from June to October : grows on rocks and old 

 walls, in the south of England : very rare. Jersey ; near Bath, 

 Cornwall, and Oxfordshire. Eng. Bot. vol. iv. pi. 240. Eng. Fl vol. 

 iv. p. 311. 1489. 



9. A.fontdnum. Smooth Rock Spleenwort. Frond bet ween lance- 

 shaped and linear; leaflets and segments wedge-shaped, deeply 



toothed ; stem and partial stalks bordered. Fronds from two to 



six inches high, very smooth. Perennial : bears fruit from June 

 to September : grows on rocks and old walls, in England : very 

 rare. Found by Mr. Bradney, on Amersham church, Bucks. Eng. 

 Bot. vol. xxix. pi. 2024. 1490. 



7. SCOLOPE'NDRIUM. HART'S-TONGUE. 



Sori linear, straight, in pairs, scattered obliquely over the 

 back of the frond, each pair between two parallel veins. Covers 

 membranous, continuous, linear, their edges folded over the 

 capsules, finally separating. Capsules numerous, stalked, 

 globular, two-valved, with a jointed ring. Seeds numerous, 

 minute. Named from the lines of fructification resembling the 

 feet of a scolopendra. 466. 



1. S. vulgdre. Common Hart's -tongue. Frond lance-shaped, 



heart-shaped at the base, smooth ; stalk and shaft scaly. Fronds 



a foot or more high, deep grass- green. Perennial : bears fruit in 

 July : grows on rocks, walls, and banks. Eng. Bot. vol. xvi. pi. 

 1156. Eng. Fl. vol. iv. p. 314. 1491. 



8. BLE'CHNUM. HARD-FERN. 



Sori linear, straight, continuous, parallel to the central rib on 

 each side, at the back of each segment of the fertile fronds. 

 Cover membranous, linear, continuous, arising from near the 

 margin of the frond and opening towards the rib. Capsules 

 numerous, stalked, globular, two-valved, with a jointed ring. 

 Seeds numerous, minute. Name, blechnon, the Greek for a, 

 fern. 467. 



