TAB. LVII. 
AsPIDIUM (POLYSTICHUM) TRIPTERON, ICze. 
Caudice brevi erecto crasso squamis magnis ovatis acuminatis 
paleaceis, stipitibus ciespitosis semipedalibus ad pedaleru 
stramineis inferne squamosis, frondibus 1-1§ ped. submem 
branaceis circumscriptione hastato-lanceolatis acuminatis 
pinna tis, pinnis numerosis U unciam longis horizontalibus 
sessilibus e basi oblique cuneata superue auriculata lanceo- 
latis grosse serratis setoso-mucronatis subtus rachibusque 
parce albo-paleaceis, infimis duabus suboppositis 4-6-un- 
cialibus iterum pinnatis, sons plerisque subbiserialibue, 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 - group 
of Aspidium by the flaccid and submembranaceous texture, 
simply pinnate, except the lowest pair of pinnaj ; 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.) 
Iab LVII. Aspidium tripteron; nat. size. Fig. 1. Por- 
tion of a pinna with young 80 ri. f 2. An old sorus, with 
the involucre nearly obsolete ;■ -magnified. 
Cent. 2. t. 57, 
