POLYPODIES. 



* * Veini reticulated with free included veinlet$> 



Free vein lets divaricate. 



DIPTERIS, Eeinwardfc. Regensb. Bot. Zeit. 11 -3. 



(Polypodii. Sp. Auct. ; Drynarise^ Sp., J. Sm.) 



Sori non-indusiate, small, round, superficial ; the receptacles punctiform. (1) Transversely sub-serial between the branches of 

 a dichotomous costa, when the segments are confluent; or (2) longitudinally untseriai on each side, a central costa in the ultimate segments, 

 when more distinct. Venation diverse : (1) in the more confluent species, the costa dichot mio-flabelliform with the veins prominent, 

 transversely anastomosing, the venules and veinlets (several series) thickly anastomosing, the ultimate or panultimate soriferous, the ulti- 

 mate branches often free dilated at the apex \ or (2) in the more distinctly divided species, costa central, the veins and venules irregularly 

 anastomosing with divaricate free sterile veinlets. 



Fronds binate, digitato-palmately-lobed, or repitito-dichotomously partite, elongafcely sbipitate, coriaceous. Rhizome woody 

 creeping, the fronds adherent, or not readily separable. So remarkable and paouliar in habit, that, relying partly on the oligocarpous 

 sori, we have kept it distinct from our Pleopdtls with which, in company with Drynaria, it is techincally allied. (Moore.) 



UlPTERIS WALLICHIL (Br.) Caudex creeping, clothed with appressed copious black hard subulato-setaceous scales 

 wrinkled at the back, stipites 1-2 and nnre feet long smooth and polished, fronds coriaceous 1-2| feet long and much wider than long 

 dark-green above, pale-yellowish ferruginous beneath, flabelliform bipartite into two nearly equal broad-cuneate portions which are pal- 

 mately and dichotomously divided, ulcimite segments 6-8-10 inches long, 1| 2 inches wide oblong acuminate, costa3 from the summit of 

 the stipes dichotomously branched through the disk of the frond, a single pair runs through each terminal segment connivent at the 

 apices, venation manifest prominent beneath, all the costoe are united by transverse flexuose costules, these by a longitudinal flexuose vein 

 through the middle into tw> naarly equal series of costular areoles, then again into lesser ones all sub -quadrangular, sori small, superficial 

 copious scattered in the areoles, but generally in series more or less perfect and accompanied by a resinous or gummy substance. Hook. Sp. 



Fit. v. 99. B r . in Hook, and Grev. Ic. Fit. t. 168-9. Wall. Cat. n. 287, Metten. Pohjpod. p. 119 ;— Drynaria, ./. Sm. ;—. Dipteris, Moore 



Ind. Fil, p. 341 ; — Polyp : macrocherios, Wall. Herb. 



The specimen figured is from the Khasya Hills— (Dr. Thomson.) 

 Hab, Khasya, Bhotan, Assam, Pundoa Mountains. 



PLATE No. LXXX, 



