THE BRITISH FERNS. 
THE TUNBRIDGE FILM FERN. 
HYMENOPHYLLUM TUNBRIDGENSE. 
H. fronds pellucid-membranaceous, ovate or oblong, more or less 
elongated, pinnate; pinn® subvertical, pinnatifid, decurrent forming 
a wing to the rachis; segments linear, undivided or bifid, and, as 
well as the upper margin of the roundish valves of the axillary 
solitary sessile compressed involueres, spinulosely serrate. [Plate 
CVIII.] 
HYMENOPHYLLUM TUNBRIDGENSE, Smith, Mem. Acad. Roy. Sc. Turin, v. 418 ; 
Id., Eng. Bot. ii. t. 162; Id., Eng. Fl. 9 ed. iv. 313. Hooker, Sp. Fil. 
i 95; Id., Gen. Fil. t. 32; Id., Fl. Lond. iv. t. 71. Hooker & Arnott, 
Brit. Fl. 7 ed. 592. Babington, Man. Brit. Bot. 4 ed. 428. Mackay, Fl. 
Hib. 345. Deakin, Florigr. Brit. iv. 122, fig. 1616. Newman, Hist. Brit. 
Ferns, 3 ed, 297. Moore, Handb. Brit. Ferns, 3 ed. 262 ; Id., Ferns of Gt. 
Brit. Natwre Printed, t. 49 A. Lowe, Nat. Hist. Ferns, viii. t. 5 B. 
Sowerby, Ferns of Gt. Brit. 75, t. 49. Bentham, Handb. Brit. Fl. 638. 
Gray, Nat. Avr. Brit. Pl. ii. 19. Willdenow, Sp. Plant. v. 520. Sprengel, 
Syst. Veg. iv. 183. Presl, Hymenophyll. 32. Hooker fil., Fl. New Zealand, 
ii. 11. Nyman, Syll. Fl. Europ. 434. 
HYMENOPHYLLUM ASPERULUM, Kunze, Lin. ix. 109. Presl, Hymenophyll. 32. 
HYMENOPHYLLUM THUNBERGI, Ecklon, Sched. Pl. Exsic. Cap. 92 ; according to 
Kunze. Presl, Hymenophyll. 32. 
TRICHOMANES TUNBRIDGENSE, Linnaeus, Sp. Plant. 1561. Hedwig, Fil. Gen. 
with figure-(t. 17). Flora Danica, t. 954. 
TRICHOMANES PULCHELLUM, Salisbury, Prod. 404. 
Caudex rigid, filiform, creeping, branched, dark brown, forming 
dense entangled carpet-like masses ; furnished about the base of the 
fronds with a few hair-like scales. Fibres slender downy. 
Vernation circinate. 
Stipes slender, wiry, terete, varying from one-third to one-half 
the length of the frond, often slightly margined or winged in the 
upper part; lateral at intervals along the caudex, to which it is 
adherent. Rachis winged. 
Fronds smooth, pellucid-membranaceous, minutely cellular, deep- 
olive or sometimes full olive-green, from one to four or six inches 

