CRYPTOGAMIA— FILICES. Hymenophyllum. 3^5 



T. pyxidiferum. Huds.46l. Bolt. Fil. 56. t. 30. With. 78\. Hull 

 243. 



T. Tunbridgense, var. 3. With. 782. Hull 244. 



Hymenophyllum Tunbridgense j3. Fl. Br. 1142. 



H. alatum. Engl. Bot. v. 20. t. 1417. Willd. Sp. PL v. 5. 526. 



Filix humilis repenSj foliis pellucidis et splendentibus, caule alato. 

 Dill, in Rail Syn. I27.t.3.f.3,4. 



In watery places, or on wet rocks, very rare. 



At Belbank, scarce half a mile from Bingley, Yorkshire, at the 

 head of a remarkable spring. Dr. Richardson. Found there, 

 by Mr. Dickson and Mr. R. Teesdale, long afterwards, in a 

 young state only, liVe Jig. 4. Gathered, in fructification, upon 

 rocks near the cascade, at the bottom of Turk mountain, Killar- 

 ney, Ireland. Mr. J. T. Mackay. 



Perennial. May, June. 



The root is creeping, cylindrical, black and downy, with several, 

 scattered, branched, vertical, stout, downy radicles. Fronds 

 springing solitarily, here and there, from the upper side of the 

 horizontal root, erect, four or five inches high, smooth, of a 

 deep transparent green, ovate-oblong, about thrice alternately 

 pinnatifid, with a winged stalk; the segments uniform, linear, 

 single-ribbed, obtuse, entire, decurrent : a few of the upper- 

 most terminating each in a solitary, imbedded, oblong or cylin- 

 drical, somewhat urn-shaped cover, continued from the leaf, 

 slightly winged at the sides, a little dilated, not lobed, at the 

 orifice. Capsules in a round mass, attached to the base of a 

 cylindrical slender receptacle, or column, which in an early state 

 does not project beyond the cover; but afterwards acquires 

 three or four times the length of that part, and is nearly as 

 prominent as in any other Trichomanes. The name of alatum, 

 therefore, would have been far preferable to brevisetum, had it 

 not been already applied by Willdenow to his 1 7th species. 



473. HYMENOPHYLLUM. Filmy-fern. 



Sm. ^ct.Taurin.v.5.4l8.f.8. Tracts 256. t. \.f. 8. Sw.Syn.Fil. 

 145. Willd. Sp. PI. v,5. 5)6. Lam.t.870. Spreng. Crypt. f. 36. 



Nat. Ord. see n. 463. 



Masses of capsules roundish, terminal, imbedded in the 

 segments of Xhe frond. Cover somewhat orbicular, com- 

 pressed, of the texture of the frond, and continuous with 

 it, of 2 equal parallel valves, opening outwards, per- 

 manent. Caps, several, sessile, crowded at the base of 

 a permanent, cylindrical, very short common receptacle, 

 whose point does not project beyond the cover, e&ch. 

 roundish, of 2 valves, bound by a vertical jointed ring. 



Fronds membranous and pellucid, like the last, much 



