344 FILTCES. [Trichomona. 



10. Adiantum. Linn. Maidenhair. 



Sori oblong or roundish. Involucres membranaceous, arising 

 from distinct portions of the margins of the frond, turned in, 

 opening interiorly. — Name, ahiavios — that which is of a dry 

 nature. 



1. A. Capillus Veneris, Linn. True Maidenhair. Frond 

 bipinnate ; pinnules thin, membranaceous, obovato-cuneate, 

 inciso-sublobate ; segments of the fertile pinnules terminated by 

 a linear-oblong sorus, sterile ones serrated. Br. Fl. ed. 3. 

 p. 455. E. Fl. v. iv. p. 2,21. E. Bot. t. 320. 



In the fissures of limestone rocks, south isles of Arran, abundant. 

 It has also been found sparingly near Roundstone, Cunnamara, by 

 Mr. J. M' Calla, and on Cahir Couree Mountain, near Tralee, by 

 Mr. Wm. Andreivs. — A most delicate and beautiful Fern, varying 

 in height from three inches to one foot and a half, according to the 

 depths of the fissures in which it grows. In our Gardens it requires 

 the protection of the green-house. 



11. Trichomanes. Linn. Bristle-fern. 



Sori marginal. Capsules upon an elongated receptacle, within 

 a cylindrical, or suburceolate, monophyllous involucre, which 

 is of the same texture as the frond, opening above. — Name ; 

 Sy'fj T P'X 0S > a hair, and jxavia, excess, from the numerous 

 hair-like, exserted receptacles of the sori. 



1. T. brevisetum, Br. Short-styled Bristle-fern. Fronds 

 thrice pinnatifid, glabrous, segments linear, entire or bifid, 

 obtuse ; involucres solitary in the axils of the upper segments, 

 margined, cylindrical, the mouth scarcely 2-lipped, shorter than 

 the receptacle. Br. Fl. ed. 3. p. 455. E. FL v. iv. p. 325.— 

 T. Europceum, Sm. in Bees' Cycl. — T. alatum, Hook, in Fl. 

 Lond. N. S. t. 53, fnot Willd.J—T. pyxidiferum, Huds.—Hy- 

 menophyllum alatum, E. Bot. t. 1417. — Hymenophyllum Tun- 

 bridgense, /3. S?n. Fl. Brit. 



Wet rocks and shady banks in warm sheltered situations, rare. — I 

 was fortunate in finding this beautiful Fern, with fructifications and in 

 considerable quantity, near Turk Waterfall, Killarney, in Oct. 1805. 

 It has since been found sparingly in one or two other places in that 

 neighbourhood. A single plant was found about the same time at 

 Powerseourt Waterfall, by Miss Fitton and Doctor Whitley Stokes, 

 where I have since seen it. A few plants were also found soon after, 

 by Mr. Nuttall, in Hermitage Glen, County of Wicklow, where I have 

 seen a single plant in a weak state. I have specimens of this 

 Fern from Madeira, collected by my late friend Doctor James Suter, 

 along with T. canariensis and several other beautiful species. I 

 have succeeded in cultivating it to perfection, by placing the pots in 

 which it is planted in the (jreen-house under a hand-glass. 



