CHARACTERS OF TRIBES AND GENERA. | 919 
the fronds being smooth, shiny, of a hard; dry texture, and 
by the ultimate divisions being terminated by a spiny 
point. The fronds of Lastrea, 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. aculeatum, and the 
other with sarmentose vernation and generally distant, 
bipinnate or decompound deltoid fronds, like P. coriaceum, 
Sect. 1.—Polystichum verum. 
Vernation fasciculate, generally erect, acaulose. 
* Fronds pinnate. 
Type. Polypodium lonchitus, Linn. 
Sp. P. Plaschnickianum (Kunze) ; P. rhizophyllum 
(Sw.) ; P. auriculatum ($w.) ; P. mucronatum (Sw) (v v.) ; 
P. falcinellum (Sw.) (v v.); P. acrostichoides (Sw.) (v v.) 
(A. auriculatum, Schk. Fil., t. 30); P. munitum (Kaulf.) ; 
P. lepidocaulon (Hook.) (v v.); P. Lonchitis (Sw.) (v v.); 
P.triangulum (Sw.) (v v.); P. obliquum (Don.) (v v.) ; P. 
ilicifolium (Don.); P. tridens (Hook.) 
** Fronds bipinnate. 
Type. Polypodium aculeatum, Linn. ec: 
P. aculeatum (Sw.) (v v-); P. lobatum (Sw.); P. angu- 
lare (Willd.) (v v-) 
INDIAN, MALAYAN, CHINESE, AND JAPANESE. 
P. Thomsoni (Hook.); P. Lachnense (Hook); P. Pres- 
` eottianum ( Wall.) ; P. lentum (Don.) ; P. discretum (Don.) ; 
. P. Tsus-Simense (Hook.); P. tripterum (Kunze) ; P. obtu- 
