POLYPODIACE.E. 279 



82. CIBOTIUM, Kaulf. 



(Pinonia, Gaud.) 



This genus is distinguished from Dicksonia and other allied genera 

 by its very coriaceous or horny indusium, the valves of which point 

 downwards; the outer valve of the same substance as the inner, quite 

 independent of, and altogether of a different consistence from the margin 

 of the frond. 



1. ClBOTIUM GLAUCUM, Hook. & Am. 



Cibotium glaucum, Hook. & Am. Bot. Beech. Voy. p. 108 (excL syn. Kaulf. & 

 Gaud.); Hook. Spec. Fil. 1, p. 82, t. 29, A. 



Hab. Sandwich Islands. 



Plant arborescent. Trunk from 6 to 8 feet high, rather slender for 

 Its stature, and crowned with large, spreading, smooth, subcoriaceous, 

 bipinnate fronds, which are glaucous beneath, and with linear-oblong, 

 acuminate, deeply pinnatifid, sessile pinnules, having serrated points. 

 Segments alternate, oblong and falcate, their apices acute and crenate. 

 Sori numerous, borne in a row near the margin, and continuing out- 

 wards about two-thirds of the length of the segments; the inner 

 valve of the indusium narrower and longer than the outer. 



Of the three species of Cibotium detected by us at the Sandwich 

 Islands, the present is decidedly the most graceful, and, as far as 

 our observations extended, the rarest; as we only found it on the 

 island of Hawaii, in deep shady forests. 



2. Cibotium Chamissoi, Kaulf. 



Cibotium Chamissoi, Kaulf. Enum. Fil. p. 230, t. 1, 14; Hook. Spec Fil. 1, p. 83. 

 Pinonia sjplendens, Gaud. Bot. Freyc. Voy. p. 369, t. 21. 



Hab. Sandwich Islands. 



