28 ADIANTUM. 



§ IV. Fro7td pedateli/ tripartite * {all jwlysoroun). (Sp. 55 — 65). 



55. A. pedatum, L. ; frond flabelliform bipartito-pedately 

 divided tripinnate, secondary pinnoe lanceolate, pinnules 

 membranaceous dimidiate oblong antrorsely subfalcato broad- 

 est at the superior truncated base very obtuse lowest ones 

 triangulav-cuneate all petiolulate, superior margin obtusely 

 lobed, lobes soriferous, sori oblong rarely curved, stipes and 

 rachis ebeneous glabrous. — Linn. Sp. PL 1557. Sw. Syn. 

 Fil. 121. Schkuhr, Crypt, t. 115. Willd. Sp. PL v. p. 

 438. A. boreale, Pr. Tent. Pterid. p. 158. 



Hab. North America, Virginia to Canada (Lake Huron), N. West Ame- 

 rica ; California {Douglas, Barclay) to Silka, Barclay. Unalascbka, 

 Chaniisso. Northern India, Kamoun, i)r. Waliich. J umnotxi, Dr. Can- 

 tor. — A very handsome species : the perfect frond is bipartite, each primary 

 ramification spreads and is recurved, bearing on the upper side several se- 

 condary pinnae, the ultimate one (or apex of each primary ramification) is 

 forked. The specimens, from Northern India, are identical with those of the 

 New World. The Unalascbka plant is referred confidently by Kaulfuss 

 to A. pedatttin, although Presl has named it as a distinct species. It is 

 probably the same as the Sitka plant, and there can be no question of its 

 identity with ours. 



56. A. tetragonum, Schrad. ; " caudex creeping, frond pe- 

 dato-tripinnate, stipes tetragonous slightly furfuraceous, rachis 

 pubescenti-paleate, tertiary pinnae (or the pinnules) ovate 

 much acuminate, superior base rounded inferior cuneate both 

 margins subincised, lobes truncated soriferous the point 

 naked (not soriferous) serrated, sori linear." — Mart. — Schrad. 

 in Goett. GeL Arnz. 1824, p. 872, n. 8. Mart. Ic. Plant. 

 Crypt. Braz. p. 93, t. 63. 



Hab. Brazil ; Woods of Bahia, between Almada and Ferradas, Mar- 

 tins. — Martius has devoted a large quarto plate to a beautiful coloured re- 

 presentation of this fine species, which evidently belongs to the same group 

 as the well known Ad. jiedatvm, and has a pedately tripinnate frond and 

 large membranaceous pinnules: these pinnules are straiglit and much 

 acuminate, the two margins nearly alike (little obliquity in the lower) and 

 both are soriferous with long (sometimes a line in length) linear straight 

 sori, very unlike any in the pedately divided group. No specimen has ever 

 come under my observation, nor that of Mr. J. Smith ; nor has any botan- 

 ist noticed it, besides Schrader and Martius. 



57. A. curvatnm,KsL\i\i'.; frond subflabellate pedately and 

 dichotomously divided tripinnate, secondary pinnae very 



* The majority of the species of this group correspond well with this 

 character. A. Le Prieurii is anomalous, from its reticulated or anastomos- 

 ing venation : A. affine passes into the ordinary tripinnate or decompound 

 form. 



