CL. XXIT.] CRYPTOGAMIA FERNS. 393 



receptacle, with a hair-like naked point projecting beyond the 

 cover. Name from thrix, a hair, and mania, excess. 470. 



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



segments linear, entire ; stalk winged. Fronds four or five 



inches high, oblong, with decurrent deep- green segments. Pe- 

 rennial : bears fruit in May and June : Belbank, near Bingley, 

 Yorkshire ; Killarney and Wicklow, Ireland. Eng. Bot. vol. xx. 

 pi. 1417 : Hymenophyllum alatum. 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, permanent. 

 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. Tunbridgense. Tunbridge Filmy-fern. Frond tender, pin- 

 nate, 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. II. Wilsoni. 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. OSMUNDA. FLOWERING-PERN. 



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 of Thor. 472. 



1. O. regdlis. Osmund Royal. Flowering-fern. Fronds twice 

 pinnate ; 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 He- 

 brides 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, 

 flattened, 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 



2 L 



