FILICES. 33 



SPECIES I.-TRICHOMANES RADICANS. Swartz. 



Plate 1839. 

 Eabenli. Crypt. Vase. Europ. Essicc. No. 116. 

 T. speciosiim, Willd. Sp. PI. Vol. V. p. 514. Milde, Fil. Europ. p. 10. Neinn. Hist. 



Brit. Ferns, ed. ii. p. 305. 

 T. brevisetuni, B. Br. Hort. Kew. ed. ii. p. 529. Sm. Eng. Fl. Vol. IV. p. 324. 

 T. alatum, Hook. Fl. Lond. Tab. 53 (non Swartz). 



T. pyxidiferuni. Linn, (parte) Sp. PI. 1561 (non Auct.). Huds. Fl. Eng. p. 461. 

 Hymenophylluni alatum, Sm. Eng. Bot. No. 1417. 

 H. Tunbridgense, var. /3, Sm. Fl. Brit. Vol. III. p. 1417. 



Rootstock wiry, elongate, creeping, thickly covered with long pitchy 

 brown hairs intermixed with shorter ones. Fronds distant. Stipes 

 wiry, from one-fourth as long to as long as the lamina of the frond, 

 with hair- like scales similar to those on the rootstock at the base, 

 nearly naked above, with an herbaceous wing on each side, which 

 is broadest at the top and vanishing towards the base. Lamina about 

 twice as long as broad, translucent, consisting of but a single layer 

 of cells, ovate or lanceolate, twice or thrice or four times pinnati- 

 partite, dark green ; ultimate segments wedge-shaped at the base, 

 pinnatifidly lobed ; rachis and secondary rachides winged ; veins 

 branching, with a branch running into each ultimate segment, 

 but not extending quite to its apex. Involucre solitary, more or 

 less exserted, cylindrical-obconic, more or less winged, truncate or 

 very indistinctly 2-lipped ; receptacle more or less ultimately 

 exserted. 



Var. a. genuinum. 



Frond ovate or oblong-ovate. Involucre conspicuously exserted. 



Yar. /3. Andreu'sii. 



Frond lanceolate. Involucre nearly wholly immersed in the sub- 

 stance of the frond. Receptacle projecting much more beyond the 

 involucre than in var. a. 



On wet, shady rocks and banks, very local. Formerly found at 

 Bell bank, near Bingley, in the west of Yorkshire. In North and 

 South Wales (Mr. Backhouse, who considers the South Wales station - 

 at least as a natural one). Near Corrie, Arran, but probably planted 

 there. In several places in the south and south-west of Ireland. 

 " Yalentia (perhaps introduced, Kinahan) ; Waterville ; Turk Moun- 

 tain and near Killarney ; Kenmare; Glouin (or Grlen) Caragh ; near 

 Derriana Lake, and Lough Carragh ; Dingle; Mounteagle ; near 



VOL. XII. f 



