Colensoane. N. O. Filices. 
TAB. CDIX. 
Po.ypopium (Dictyopteris) arrenuatum. Br. 
Caudice repente radicibusque ferrugineo-tomentosis, frondibus 
simplicibus aggregatis submembranaceis lanceolatis costatis 
basi in petiolum longe attenuatis reticulatis, areolis oblongis, 
soris ellipticis oblongis uniserialibus anastomosi venularum 
insidentibus. 
Polypodium attenuatum. Br. Fl. Nov. Holl. p. 147. Spreng. 
Syst. Veget. v. 4. p. 56. 
P. Brownianum. Spreng. (fide Presl). 
Dictyopteris attenuata. Presi. Tent. Pterid. p. 194. Hook, Gen. 
Fil. tab. LX XI. B. 
Has. New Holland. Brown. New Zealand. All. Cunningham. 
Wm. Colenso, Esq. | 
__ The nature of the venation is of the highest importance in 
_ the study of the ferns; sometimes for discriminating species, — 
_ and not unfrequently, especially when combined with difference 
in habit, for distinguishing genera. The simply reticulated 
_ Yenation in this and some allied species, has induced Presl to 
_ Constitute the genus Dictyopteris. In the present instance the | 
— are dense and prominent, the stalks of the sporangia very 
long, and they are mixed with articulated filaments or abortive 
Sporangia. 
ig. 1. Portion of the fertile frond. f. 2. Sporangia and 
articulated filaments ; magnified ve | 
