CHARACTIES OF TRIBES AND QENEEA. 297 



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

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

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

 arguta, Ait. (v v.) ; P. tremula, B. Br. (v v.) ; P. Crossus, 

 Bory. ; P. felosma, /. Sm. (v v.) ; P. nemoralis, Eooh. and 

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



tt Fronds tripartitely hranched, deltoid, generally 



quadripinnate. 



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



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



Hoolc. {LoncUtis, Linn. ; P. laciniata, Willd.) (v v.) ; P. 



Griesbreghtii, /. Sm. (v v.). 



The above sjoecies are widely disi^ersed, being found in 

 the tropical and subtropical regions of both hemispheres. 



170.— Oenithopteeis, Agardli. (1839.) 

 Pleris fp. aitct. ; Hook. Sj). Fit. 



VernoJion 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. Veiri,s 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. 



Ulust. Moore Ind. Fd., p. 30, %. 5, 6 ; Hook. Sp. Fil., 

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



Obs. — The sarmentose caudex and special asjoect of 



