CHARACTERS OF TRIBES AND GENERA. 321 



(v v.) ; A. polyodon, Forst. (v v.) ; A. falcatum, Lam. 

 (v v.) ; A. caudatum, Forst. (v v.) ; A. paleacum, It. Br. 

 (v v.). 



11. EROSUM GROUP (TaracJiia, Pr.) 



Fronds 'bi-tripinnate, decompound, rarely linear or simply 



forked ; segments rarely otherwise than cuneiform, with 



erose apices ; venation often flabellate, the costa being 



undefined or evanescent. 



A. septentrionale, Schk. (v v.) (Acropteris. Link.) ; A. 



germanicum, Weis. (v v.) ; A. Seelosi, Sielold (v v.) ; 



A. Ruta-muraria, Linn, (v v.) ; A. cuneatum, Lam. (v v.) ; 



A. prEemorsum, Sw. (v v.) ; A. furcatum, Thunb. (v v.) ; A. 



laserpitiifolium, Lam. (v v.) ; A. dimidiatum, Sw. (v v.) 



(A. zamicefolium, Lodd.) A. contiguum, Kaulf. (v v.) ; A. 



erosum, Linn, (v v.) ; A. nitidum, Sw. (v v.). 



Sect. 4. ACTINIOPTERIS, Link. 



Fronds stipate, flagellate, 6 to 8 inches high, rigid ; segments 

 linear rachiform. Veins radiating and dichotomous. 



A. radiatum, Sw. (v v.). 



OBS. This is a remarkable Fern, of which Sir William 

 Hooker says, " perfectly sui generis. Even its place in the 

 Fern arrangement is doubtful. The frond is in no way 

 foliaceous, but rachiform in its divisions, and, before ex- 

 pansion, it is, as it were, refracted (not circinate) upon the 

 stipes, and in appearance then, and even when fully 

 developed, very much like some small Chamcerops among 

 the Palms." 



Although such is the view of this Fern, taken by Sir 

 Win. Hooker, I nevertheless do not find sufficient character 

 beyond its habit, to separate it from Asplenium. It is 



