286 CHARACTERS OF TRIBES AND GENERA. 
Hook. (v v.); P. Bojeri, Hook.; P. pilosa, Hook. ; P. pro- 
fusa, J. Sm. (v v.); P. nitidula, J. Sm.; P. pulchella, 
J. Sm. 
** SPECIES OF THE WESTERN HEMISPHERE. 
P. lomariacea, Hook. ; P. intramarginalis, J. Sm. (v v.) ; 
P. rigida, Hook. (Cheiloplecton, Fée, 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. marginata 
(Hook.) ; P. cuneata (Link.) ; P. angustifolia (Humb.) 
161.—Onycutum, 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. Jndusium 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. 
Ilust. Hook. and Bauer. Gen. Fil, t. 11; Moore Ind. 
Fil, p. 28 B.; J. Sm. Ferns, Brit. and For, fig. 955 
Hook. Syn. Fil., t. 3, fig. 27. | 
Oss.—Although the technieal 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- 
