CHARACTERS OF TRIBES AND GENERA. 219 



the fronds being smootb, shiny, of a hard, dry texture, and 

 by the ultimate divisions being terminated by a spiny 

 point. The fronds of Lasfrea, on the contrary, are soft, 

 and generally villose, and soon wither and crumple up 

 "when separated from the plant. 



In arranging the species I have followed the plan indi- 

 cated in my " Catalogue of Cultivated Ferns," by which 

 they are thrown into two natural groups ; one with fasci- 

 culate vernation and lanceolate pinnate or bi-tripinnate 

 fronds, typically represented by P. actdeatum, and the 

 other with sarmentose vernation and generally distant, 

 bipinnate or decompound deltoid fronds, like P. coriaceum. 



Sect. 1. — Polysiichum veruin. 

 Vernation fasciculate, generally erect, acaulose. 

 * Fronds pinnate. 

 Type. Polypcjclmm loncMtus, Linn. 



Sp. P. Plaschniokianum (Kuaze) ; P. rhizophyllum 

 (^Sw.) ; P. auriculatum (^Sia.) ; P. mucronatum {Sio) (vv.) ; 

 P. falcinellum {Sw.) (v v.) ; P. acrostichoides {Siv.) (v v.) 

 (A. auriculatum, S'chlc. Fil., t. 30) ; P. munitum {Kaulf.) ; 

 P. lepidocaulon (Soak.) (v v.) ; P. Lonchitis (Sio.) (v v.) ; 

 P.triangulum {Siv.) (v v.) ; P. obliqumn (Don.) (v v.) ; P. 

 ilicifolium {Don.) ; P. tridens {Hoolc.) 



** Fronds hipinnate. 

 Type. Polypodium aculeatum, Linn. 



P. aculeatum {Sw.) (v v.) ; P. lobatum (Sio.) ; P. angu- 

 lare {Willd.) (v v.) 



Indian, Malayan, Chinese, and Japanese. 

 P. Thomsoni {Hoolc.) ; P. Lachnense {Hook) ; P. Pres- 

 cottianum {Wall.) ; P. lentum (Don.) ; P. disoretum (Don.) ; 

 P. Tsus-Simense (Hook.) ; P. tripterum (Kunze) ; P. obtu- 



