196 CHARACTERS OF TEIBES AND GENERA. 



plants show that D. irregularis and D. macrodonta (Cumin- 

 gianum, Hook.) are distinct, the one having- erect vernation, 

 the other decumbent. In the " Species Filicum " eight 

 species are described, but I very much doubt if they are 

 all distinct. 



100. DIPTERIS, Eeinw. (1825). 

 Polypodium, sp., auct., and Hook. Sp. Fil. 



Vernation uniserial, distant, sarmentum setose-squamose. 

 Fronds long stipate, 3 to 6 feet high, broad flabelliform in 

 two lobes ; the lobes digitately laciniated, lacinee lanceo- 

 late, entire or serrate. Primary veins radiating in each 

 lobe, 2 or 3 times forked ; secondary veins transverse anas- 

 tomosing, and producing numerous venules and veinlets, 

 forming sub- quadrangular small areoles and containing free 

 clavate veinlets. Receptacles punctiform, compital. Sori 

 small, numerous, and irregular, or in one species longitu- 

 dinal uniserial. 



Type. Polypodium conjugatum, Kaulf. 



Illust. Hook, and Grev., t. 168 and 169 ; Blume, Fil. 

 Jav., p. 174, t. 81 ; Moore, Ind. Fil., p. 64, A. ; 

 Horsf., Flora Jav., 1, t. 1 ; Hook., Syn. Fil., t. 5, 

 fig. 48, N. 



OBS. This genus contains three known species, natives of 

 the East India, Malay and Polynesian Islands, two of them 

 being remarkable for having large fronds resembling Fan 

 Palms. This genus agrees in venation and character of 

 the sori with Drynaria, but its adherent vernation brings 

 it under the division Desmobrya. 



Sp. D. conjugata, Beinw. (P. Horsfieldii, Br.) ; D. 

 Wallichii (Hook, and Grev.) j D. Lobbiana (Hook.) ; Bedd. 

 F. Brit. Lid., pi. 233. 



