286 CHARACTERS OP TRIBES AND GENERA. 



Hook, (v v.) ; P. Bojeri, Hook. ; P. pilosa, Hook. ; P. pro- 

 fusa, J. Sm. (v v.) ; P. nitidula, /. Sm. ; P. pulchella, 

 J. Sm. 



** SPECIES OF THE WESTERN HEMISPHERE. 



P. lomariacea, Hook. ; P. intramarginalis, /. Sm. (v v.) ; 

 P. rigida, Hook. (Cheiloplecton, Fee, Iconogr. Nouv. 33) ; P. 

 Skineri, Hook. ; P. Seemanni, Hook. ; P. mucronata, 

 Eaton (v v.) (P. Wrightii, Hook.) ; P. ternifolia, Link, (v v.) ; 

 P. ornithopus, Hook. ; P. densa, Hook. ; P. inarginata 

 (Hook.) ; P. cuneata (Link.) ; P. angustifolia (Humb.) 



161. ONYCHIUM, Kaulf. (1820). 

 Hook. Sp. Fil. 



Vernation fasciculate and decumbent, or distant and sub- 

 sarmentose. Fronds decompound, multifid, 1 to 3 feet high, 

 smooth ; sterile segments cuneiform. Veins forked, free, 

 their apices clavate ; fertile segments linear, apiculate, 

 veins simple, short, their apices transversely combined by 

 the receptacle, forming a linear sorus. Indusium slightly 

 intramarginal, its free margin conniving with the margin 

 of the opposite indusium (siliquiform), ultimately becoming 

 replicate, the sporangia of both confluent. 



Type. Onychium auratum, Kaulf. 



Illust. Hook, and Bauer. Gen. Fil., t. 11 ;. Moore Ind. 

 Fil., p. 28 B. ; J. Sm. Ferns, Brit, and For., fig. 95 ; 

 Hook. Syn. Fil., t. 3, fig. 27. 



OBS. Although the technical character of the sori of 

 this genus does not differ from Pteris, the general aspect 

 of the species is however entirely at variance with the 

 whole of that genus, except P. scaberula, which in the 

 smallness of its pinnules presents some similarity to Ony- 



