130 PKLL.EA. 



(American) form, although they are not quite so large ; but, while the majority 

 of the Indian specimens are as here described, there are others that are more 

 slender and flaccid, with fronds and narrower fertile pinnules, in short, in all 

 particulars resembling our own native specimens. 



c. forma Americana ; erect generally rather stout, pinnules 

 of the sterile fronds usually ellii)tical or ovate and more or less 

 deeply and regularly serrated, those of the mature fertile fronds 

 rather broad-oblong with the margins (or involucres) much 

 spread. — Cryptogramme acrostichoides, Br. in App. Franklin 

 and Richardson's First Journ. pp. 39 and 54. Hook, et Grev. 

 Ic. Fil. t. 29. Fee, Gen. Fit. p. 131. AUosorus crispus, 

 KauJf. 



Hab. N., and chiefly N. W., America, Hudson's Bay Company's territories, be- 

 tween 56° and 60° north, Sir John Richardson. First found by Mr. Menzies 

 at Nootka Sound. Abundant on dry rocks between the grand rapids and great 

 Falls of the Columbia, and on the mountains of Macgillivray's River, and sparingly 

 in the Rocky Mountains near the source of the Columbia, 1825, 6, and 7, Douglas. 

 (The specimens from these stations may be considered the types of the C. acro- 

 stichoides, Br., and were the first recognized specimens referred to Cryptoyamme; 

 and they have the broad, flattened, mature, fertile pinnules, and generally ellipti- 

 cal, rigid, sterile ones.) — Island of Kodiak (Ruprecht) ; North-west coast of Ame- 

 rica, both at Kodiak and Sitcha, Barclay ; Unalashka, Chamisso ; Sitka, Mertens 

 e Rupr.; all these, and specimens just received (March, 1 857) from J. A. Laphani, 

 Esq., gathered on Isle Royale, Lake Superior, by W. D.Whitney, Esq., — the only 

 locality known within the U. States, — possess quite the European form. 



9. Pell^a, Link (1841), Fee. 



Allosorus, in part Presl, scarcely of Bernhardi, (Hook. 

 Gen. Fil. tab. V., and tad. CXV. A., as Platyloma, J. 

 Sm.) Pteridis sp., Linn, and others. 



Sari linear or oblong, occupying the upper portion of the 

 simple or forked veins, at length becoming confluent and 

 forming a continued more or less broad marginal line of 

 fructification. Involucre marginal, generally narrow continu- 

 ous, formed of the dilated more or less changed and often 

 membranaceous margin of the frond, at first revolute, at 

 length frequently spread open, so as to expose the entire 

 fructification. — Ferns tropical or subtropical and of temperate 

 regions. Caudex often creejnngj Fronds simple and palmate 

 or pedate, or j)innate, or more generally bi-tripinnate or de- 

 compound, mostly of a harsh and rigid character and when 

 dry of an olive-brown colour. Veins pinnate, free, mostly 

 inconspicuous and sunk in the thick and opaque substance. 

 Stipes more or less elongated, and together with the straight 



