82 



DXOKSONXEiE. 



B, Indusium distinctly two-valved, 



DXCKSONIA. L' Heritier Sertum Anglicum, SO. 



(Balantium, Kaulfuss. Presl ;—Culcita, Presl. ; Leptopleuria, Presl ; Cystodium, J* Smith ; Davalliae Sp., Aiich; Cibotii Sp., 

 Anct. ; Microlepiee Sp., And. ; Pataniae Sp., Auct. ; Nephrolepidis Sp., Mettenius.) 



Sori involucrately-indusiate, globose or short transverse oblong, marginal, more or less reflexed ; the receptacles globose or 

 transverse oblong, terminal. Indusium coriaceous, double, i. e. two-valved ; the outer or accessory valve formed of a more or less atte- 

 nuated lobule of the frond, cucullate, sometimes equalling in size, but more frequently larger than the inner valve or proper indusium, 

 which latter, when smaller, is less convex than the outer. Veins simple forked or pinnate, from a central costa, venules free. 



Fronds coriaceous, usually large decompound, sometimes pinnate, the fertile portions appearing somewhat contracted. Rhizome 

 thick, short, erect or arborescent ; sometimes decumbent, criniferous. Agenus of noble ferus, including several arborescent species. It is 

 distinguished from Dennstcedtia by the two-valved, not entire cup-shaped, indusium ; and from Cibotium by the more or less herbaceous 

 texture of the outer valve of the Indusium, which in Dicksonia, is but a partially changed lobule of the frond. (Moore.) 



DlCKSONIA. APPENDICULATA. (Wall.) Every where especially beneath piloso-glandular, fronds lanceolate tall, much 

 attenuated at the base bipinnate, pinnae narrow, oblong almost linear pinnatifid, the segments oblong entire or bi-trifid, the base decurrent 

 on the rachis, sori large, globose copious upon the shortened teeth of the segments. Hook, Sp. Fil, i. 79. Wall. Cat. n % 65, 



The figure is taken from Sir W. Hooker's Sp. Fil. 



Hab. Nepal, Kumaon. 



PLATE No. LXXXII. 



