CHARACTERS OP TRIBES AND GENERA. 297 



P. excelsa, Gaud. ; P. lata, Link, (v v) ; P. paleacea, Roxb. 

 (v v.) ; P. scabra, Bory. ; P. Kingiana, Endl. (v v.) ; P. 

 flabellata, Thunb. (v v.) ; P. straminea, Mett. (v v.) ; P. 

 arguta, Ait. (v v.) ; P. tremula, R. Br. (v v.) ; P. Croesus, 

 Bory. ; P. felosma, /. 8m. (v v.) ; P. nemoralis, Hook, and 

 Bauer, t. 64 A. (?) Willd. 



ft Fronds tripartitely branched, deltoid, generally 



quadripinnate. 



P. deflexa, Link, (v v.) ; P. pellucens, Agardh. ; P. con- 

 nexa, J. 8m. ; P. decussata, /. 8m. (v v.) ; P. hirsuta, 

 Hook. (Lonchitis, Linn. ; P. laciniata, Willd.) (v v.) ; P. 

 Griesbreghtii, J. Sm. (v v.). 



The above species are widely dispersed, being found in 

 the tropical and subtropical regions of both hemispheres. 



170. ORNITHOFTERIS, Agardh. (1839.) 

 Pteris sp. auct. ; Hook. Sp. Fil. 



Vernation uniserial, distant, sarmentum hypogeous, thick 

 and fleshy, or epigeous and slender. Fronds tri-quadri- 

 pinnate, deltoid, from 1 to 6 or 10 feet high, opaque, 

 coriaceous ; ultimate segments entire or unequally lacin- 

 iated. Veins simple or forked, the sterile free, the apices 

 of the fertile transversely combined by the receptacle 

 forming a linear sorus, furnished with a special, exteriorly 

 attached, linear indusium, and also with an accessory in- 

 dusoid membrane, rising from the inner side of the recep- 

 tacle, but often obsolete. 



Type. Pteris aquilina, Linn. 



lllust. Moore Ind. Fil., p. 30, fig. 5, 6 ; Hook. Sp. Fil., 

 t. 141 ; Hook. Syn. Fil., t. 3. fig. 31 d. e. f. 



OBS. The sarmentose caudex and special aspect of 



