Asplenium.] FILICES. 341 



10. A. dumetorum, Sm. Thicket Shield-fern. " Frond 

 doubly pinnate ; leaflets pinnatifid ; lobes with terminal sharp 

 prickly teeth ; common stalk scaly ; cover orbicular, flat with 

 a deep notch." Sm. E. FL v. iv. p. 294. Br. Fl. ed. 3. 

 p. 451. 



Bushy and dry stony places. Near Powerscourt Waterfall and side 

 of Djouce Mountain, abundant. Much smaller than A. dilatatum of 

 Sm. both in the wild and cultivated state, although perhaps only a va- 

 riety of it. 



4. CISTOPTERIS. BernhardL Bladder-fern, f Cystea, Sm.) 



Sort roundish. Involucre inserted, by its broad cucullate 

 base, at the under side of the sorus, opening by a lengthened 

 free extremity, which points towards the apex of the frond. 

 Name compounded of Kunrj, a little box, and Tn-epis, a 

 fern. 



1. C. fragilis, Bernh. Brittle Bladder-fern. Fronds bipin- 

 nate; pinnae ovato-lanceolate ; pinnules ovato-lanceolate, deeply 

 pinnatifid ; segments ovate or lanceolate, toothed ; rachis 

 winged. Br. FL ed. 3. p. 452. Cystea fragilis, E. Fl. v. iv. 

 p. 298. Aspidiumfragile^Sw. Hook. Scot. 2. p. 155. Cyathea 

 fragilis, E. Bot. t. 1587. 



Rocks and walls, in the mountainous parts of the southern,"northern, 

 and western counties. 



5. ASPLENIUM. Linn. Spleen-wort. 



Sori oblong or linear. Involucres of the same shape, superfi- 

 cial, arising from the lateral veins, and opening on one side 

 longitudinally towards the central nerve or midrib. Name, 

 a, not, and trTrXvjv, the spleen, the plant having been supposed 

 useful in removing obstruction of the viscera. 



1. A. Trichomanes, Linn. Common Wall Spleen-wort. 

 Fronds pinnate ; pinnae roundish-oblong, obtuse, crenated, trun- 

 cato-cuneate at the base ; (stipes and rachis black.) Br. Fl. 

 ed. 3. p. 453. E. Fl. v. iv. p. 305. E. Bot. t. 576. 



Rocks and walls, common. 



2. A. viride, Huds. Green Spleen-wort. Fronds pinnated ; 

 pinnaa roundish-ovate, obtusely serrated, cuneate at the base, 

 (rachis green.) Br. Fl. ed. 3. p. 453. E. Bot. t. 2257. E. 

 FL v. iv. p. 306. 



Moist rocks on mountain cliffs. Turk Mountain, Killarney ; Ben 

 Bulben, County of Sligo, and on the Donegal Mountains near Lough 

 Eske. 



3. A. marinum, Linn. Sea Spleen-wort. Fronds pinnate ; 



