CL. XXIV-3 CRYPTOGAMIA FERNS. 393 



a hair-like naked point projecting beyond the cover. Name from 

 thrix, a hair, and mania, excess. 470. 



1. T. brevisttum. Bristle-fern. Frond thrice pinnatifid, smooth; seg- 

 ments linear, entire ; stalk winged. Fronds four or five inches high, 



oblong, with decurrent deep-green segments. Perennial: bears fruit in 

 May and June : Belbank, near Bingley, Yorkshire ; Killarney and 

 VVicklow, Ireland. Eng. Bot. vol. xx. pi. 1417 : Hymenophyllum atatum. 

 Eng. Fl. vol. iv. p. 325. 1496. 



12. HYMENOPHY'LLUM. FILMY-FERN. 



Sori roundish, terminal, imbedded in the segments of the frond. 

 Cover compressed, of the same texture as the frond and conti- 

 nuous with it, of two equal valves, opening outwards, perma- 

 nent. Capsules several, sessile, roundish, two-valved, with a 

 jointed ring, crowded at the base of a permanent, cylindrical, 

 common receptacle, with a hair-like point not projecting beyond 

 the cover Name from hymen, a membrane, and phyllon, a leaf. 



471. 



1. H. Tunbridgtnse. Tunbridge Filmy-fern. Frond tender, pinnate, 

 smooth, the linear segments and covers acutely toothed ; the shaft 



strongly winged. Fronds two or three inches high, with hair-like 



stalks. Perennial : bears fruit in May and June : grows among moss in 

 moist rocky places in the north of England, in Ireland and Wales. Eng. 

 Bot. vol. iii. pi. 162. Eng. FL vol. iv. p. 326. 1497. 



2. H. Wilsdni. Scottish Filmy-fern. Fronds stiff, pinnate, the linear 

 segments acutely toothed; covers entire; the shaft slightly margined. 



Perennial : bears fruit in May and June : grows among moss in 



moist rocky places. North of England and Wales : common in Scotland 

 and Ireland. Brit. FL p. 448. 1498. 



13. OSMU'NDA. FLOWERING-FERN. 



Capsules clustered, distinct, stalked, nearly globular, one-celled, 

 with two incomplete equal valves. Cover none. Seeds numerous, 

 minute. Name of Saxon origin : Osmunder was one of the names 

 ofThor. 472. 



1. 0. regdits. Osmund Royal. Flowering-fern. Fronds twice pin- 

 nate; leaflets oblong, nearly entire, dilated at the base ; clusters panicled, 



terminal. Frond from two to four feet high: the most beautiful of 



our ferns. Perennial: bears fruit in June and July: grows in watery 

 places : not common : frequent in the outer Hebrides and south of 

 Ireland. Eng. Bot. vol. iii. pi. 209. Eng. FL vol. iv. p. 327. 1499. 



14. BOTRY'CHIUM. MOONWORT. 



Capsules distinct, sessile, on the upper side of a branched, flat- 

 tened, common stalk, nearly globular, one-celled, with two equal 

 valves. Cover none. Seeds numerous, minute. Name from botrus, 

 a bunch of grapes. 473. 



1 . B. Lundria. Common Moonwort. Stalk with a single pinnate leaf ; 



leaflets kidney-shaped, entire. From two to five inches high : stalk 



2 L 



