334 Ferns of British India and Ceylon. 



13. Niphobolus nummularlefolius. (Sw. under Acrostichuni). 

 Rhizome slender wide-creeping, filiform, clothed with bright ferru- 

 ginous lanceolate fibrillose scales ; fronds dimorphous, carnose-coria- 

 ceous, the barren ones roundish or elliptical, subsessile \ — 1 inch each 

 way, the ferule ones longer and narrower, i§-2 inches long, \-\ 

 inch broad, upper surface naked, at least in age, lower densely 

 coated with loose ferruginous woolly tomentum ; veins forming areoles 

 irregular in size and shape, empty or with one free veinlet, marginal 

 veinlets free ; sori close, scattered, sometimes covering the whole 

 surface. Sw. Syn. Fil. 191, 419/1? 2. Polyp, nummularis folium. 

 Mett. Farngatt Polyp. 122, t. 3. Hook. Sj>. Fil. v. 54. Syn. Fil. 351. 

 Bedd. F. B. I. t. 320. Galeoglossa, Presl. 



East Bengal, Bhotan, Assam, Khasya, Cachar, up to 2,500 feet 

 elevation. There is a variety from Khasya (obovatum, Mett.) with 

 the sterile fronds obovate on a f inch petiole. This species is 

 abnormal in the genus, I do not think it is a Niphobolus at all, but 

 probably a Drymoglossum. 



GENUS LXIIL— DIPTERIS. {Reinw.) 



(Di, two ; pteris, fern — the fan-like fronds in two parts.) 



Fronds adherent to the caudex, flabellate in two halves which 

 are deeply lobed from their circumference in the direction of the 

 base, secondary veins forming many areoles, including free or netted 

 veinlets ; sori punctiform, numerous, scattered small, or in a single 

 series. 



1. Dipteris Wallichii. {Br.) Rhizome stout, creeping, 

 clothed with appressed copious black hard subulate setaceous scales 

 wrinkled at the back; stipes 1-2 and more feet long, smooth and 

 polished, distant erect; fronds coriaceous, 1-2 \ feet long and much 

 wider than long, dark-green above, whitish or ferruginous beneath, 

 flabelliform bipartite into two nearly equal broad-cuneate portions 

 which are palmately and dichotomously divided, ultimate segments 

 6-10 inches long, i|-2 inches wide, oblong acuminate; costse 

 from the summit of the stipes dichotomously branched through the 



