ACOTYLEDONS. FTLICEs. Aspidiltm. 153 



1, Gr. Ce/eracA, fronds pi nnatiful covered with imbricating chaffy 

 scales beneath, segments all coadunate ovate obtuse, scale^i 

 entire. WiUd. Scolnpendrium Ceterach, E. B. t, 1244. As- 

 plenium Ceterach^ Light/, p. 661. 



Hab. Fissures of rocks. Hill of Kinnoul, Perth, Light/. 



2. POLYPODIUM. 



Son (or clusters of fructification) roundish. Involii:re 0. 

 * Fronds pinnatifid. 



1. P. vulgare, fronds deeply pinnatifid, the segments linear- 

 lanceolate obtuse crenulate approximate, the superior ones 

 gradually smaller, caudex chaffy. Llght/.p. 667. E. B.t. 1 149. 



■*■* Fronds bipinnati/id. 



2. P. PhegopteriSf fronds bipinnatifid, the two lowermost pin- 

 nae deflexed, their segments linear lanceolate obtuse entire ci- 

 lated, the lowermost ones adnato-decurrent, veins hairv, sori 

 marginal. Light/. p.GQ9. E. B.t. 2224. 



Hab, Shady rocky places, in the Lowlands, frequent^ Light/. 



*** Fronds thrice compounded. 



3. P. DryopteriSf fronds ternate bipinnate patulous and deflex- 

 ed, the segments obtuse subcrenated, sori marginal, root fili- 

 form. Lighi/.p.67S' E.B.t.Q\(]. 



Hab, Dry stony places, not uncommon. 



3. WOODSIA. Br. 



Sori scattered, roundish, having beneath an involucrum which is 

 cut at the edge into many capillary segments. 



1. W. hj/perlorea, fronds lanceolate pinnated, pinnae ovato-cor- 

 date inciso-pinnatifid hairv beneath, sori solitary at length 

 confluent. Br. in Linn, trans, u. 1 1. M 1. E. B. i. 2023 

 {Pohjpodium hyperloreum.). Acrostickum iluense^ Huds., 

 With., {not o/ Linn, according to Sm.) 



Hab. Alpine rocks rare. Ben Lawers, Dickson. Clova mounlauis, 

 G. Don. 



4. ASPIDIUM. 



Sori roundish, scattered. Involucre umbilicated, or opening on 

 one side. fViUd. 



* Fronds pinnated. 



I. A. Lonchitis, fronds pinnated, pinnae lanceolato-falcatc acute 

 ciliato-serrate, the upper base acutely auriclcd the lower one 

 euneate, superior pinnae bearing the fructifications, stipes 

 chaffy. E. B. t. 796, and Light/, p. 66,9 (Pohjpodium Lon- 

 chitis). 



Hab. Shady clefts of rocks among the Highland mounttiin^;, not un- 

 common. 



