TAB. LVIL 
Aspidium (Polystichum) TRIPTERON, Kze, 
Caudice brevi erecto crasso squamia magnis ovatis acuminatis 
paleaceis, stipitibus caespitosis semipedalibus ad pedalem 
stramineis inferne squamosls, frondibus 1-1 J ped. submeni” 
branaceis circumscriptione hastato-lanceolatis acuminatis 
pinnatis, pinnis numerosis IJ unciam longis horizontalibus 
sessilibus e basi oblique cuneata superne auriculata lanceo- 
latis grosse serratis setoso-mucronatis subtus racbibusque 
parce albo-paleaceis, infimis duabus suboppositis 4-6-un- 
cialibus iterum pinnatis, soris plerisque subbiserialibus, in- 
volucris parvis orbicularibus peltatis demum obsoletis. 
Aspidium tripteron^ Kze, Bot, Zeit, 6. p. 509 ; Metten, Aspid, 
p. 51. 
Hab. Island of Tsus Sima, Gulf of Korea, Wilford, Japan, 
Goring ; Hakodadi, C, P. Hodgson^ Esq, 
A species well distinguished among the Polystichum-grou^ 
of Aspidium by the flaccid and submembranaceous texture, 
simply pinnate, except the lowest pair of pinnse ; these are 
greatly elongated and again pinnate, resembling two ears, and 
spreading so horizontally as to form in circumscription a has- 
tate frond. In the more advanced state of the fructification, 
the delicate involucre is so shrunk and concealed by the 
copious capsules of the sori that the Fern resembles a Poly- 
podium (§ Phegopteris.) 
Tab. LVII. Aspidium tripteron ; nat, size. Fig, 1 . Por- 
tion of a pinna with young sori. f, 2. An old sorus, with 
the involucre nearly obsolete ; — magnified. 
Cent. 2 . t, 57 . 
