POLYPODIACE^E. 



101 



The usual form of this occurs very frequently, in dry rocky situ- 

 ations at all the habitats cited. In the var. (3. the stipes are more 

 slender, their branches divaricate, and the somewhat flabellate pinna 

 shorter than in the original. 



* * * # * Frondes supradecompositce. 



16. Adiantum formosum, R. Br. 



Adiantum formosum, K. Br. Prodr. Fl. Nov. Holl. p. 155; A. Rich. Bot. Voy. Astrol. 

 p. 88 ; A. Cunn. in Hook. Comp. Bot. Mag. 2, p. 366. 



Hab. Illawarra, and shores of Port Jackson, New South Wales. 



The stipes of this are nearly round, black, shining, and rough. 

 Fronds supradecompound, and rising to the height of 4 to 5 feet. 

 Pinnules numerous, glabrous, subrhomboid, crenate-dentate. Partial 

 rhachis pilose. Sori punctiform, with a reniform indusium. 



17. Adiantum pentad actylon, Langsd. & Fisch. 



Adiantum pentadactylon, Langsd. & Fisch. Ic. Fil. p. 22; Willd. Spec. PL 5, p. 448; 

 Kaulf. Enum. Fil. p. 206 ; Hook. & Grey. Ic. Fil. t. 98. 



Hab. Organ Mountains, Brazil. 



Closely allied to the A. trapeziforme of Linnaeus ; but easily recog- 

 nised by its more acuminate and incisely-lobed pinnules. 



18. Adiantum teuncatum, Raddi. 



Adiantum truncatum, Kaddi, Plant. Brasil. p. 59, t. 78, f. 1. 

 A. betidimim, Kaulf. Enum. Fil. p. 207. 

 A. conicum, Velloz. Fl. Flumin. 11, t. 97. 



Hab. Organ Mountains, Brazil. 



There are few species of Adiantum that exhibit such a distinct 



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