CRYPTOGAMIA— FILICES. Cystea, 301 



3. C. angustata. Deep-cut Mountain Bladder- fern. 



Frond oblong, doubly pinnate ; leaflets lanceolate, decur- 

 rent, wavy, or pinnatifid, with linear, acute, pardy 

 cloven, segments. Masses scattered, permanently dis- 

 tinct. 



Polypodium fragile angustatum. Hoffm. in Rcem. and Ust. Mag. 



fasc.9. 11./. 14. d. 

 P. tenue. Hoffm. Germ. v. 2. 9. 

 P. rhaeticum. Dicks. H. Skc. fast. \.\7. With. 780. Bolt. Fil.W. 



t. 45. 

 P. polymorphum A, rhseticum. Villars Dauph. v. 3. 846. t. 53./. A. 



From the author, agreeing precisely with Mr. Dickson's speci- 

 mens. 

 P. ilvense. Rnii Syn. 1 1 7. 

 Cyathea fragilis /3. Fl. Br. 1 139 ; omitting the references to Ray 



and Plukenet, which belong to Aspidium dumetorum. 

 C. fragilis y. Fl. i^r. 1139. 

 Aspidium fragile /3. JVilld. Sp. PL v. 5.28 \ ; omitting the syn. of 



Ray and Plukenet. 

 A. rhaeticum. Willd. Sp. Pl.t. 5. 280; omitting the reference to 



Linnceus, and perhaps Swartz. 

 Filix pumila saxatilis altera. Clus. Hist. v. 2.212. f. Pann.706.f. 

 Filicula petraea mas. Ger. Em. 1 142./. 

 F. fontana major, sive Adiantum album filicis folio. Bauh. Pin. 



358 J according to the opinion of Linnceus. 



In mountainous woods, or about shady rocks^ on the loftiest hills 

 of Scotland, Wales, and the north of England. 



On shady rocks in Scotland. Dickson. Near Llanberis, North 

 Wales. Mr. Lhwyd. Brought from Gordale in Craven, by the 

 late Mr. Curtis, whose specimen, rightly named, is in my pos- 

 session. 



Perennial. June, July. 



Root tufted, or somewhat creeping, black, with long fibres, and 

 rusty scales. Fronds several, erect, twelve or fifteen inches 

 high, of wlych the slender, blackish, smooth and naked staZA; 

 occupies more than one-third, sometimes nearly half ; the mid- 

 rib above is still more slender, and, like every other part, quite 

 smooth, without any membranous border. Main wings, or 

 leaves, bright green, from twelve to fifteen pair, of a moderate 

 length, nearly opposite, taper-pointed ; the lowermost rather 

 shorter, and more remote from the next, than those about the 

 middle of each frond ; all pinnate, with a scarcely bordered mid- 

 rib. Leaflets about ten at each side, alternate, lanceolate, 

 decurrent, rather bluntly pointed, sometimes tapering at the 

 extremity; all either deeply pinnatifid, with oblong, acute, 

 wavy segments ; or, in less luxuriant plants, sliglitly pinnatifid, 



