POLYPODIACE.E. $5 



The fronds of this in our possession are very large, but without 

 fructification. They resemble very much the Platycerium (Acros- 

 tichum) grande of A. Cunningham, a native of Moreton Bay ; which 

 we saw in a cultivated state at Sydney, New South Wales, and 

 which is well represented in the Narrative of the Expedition, Vol. II., 

 p. 181. 



33. C Y R T G N I U M, /. Sm. 



(Acrostiohi Spec. Auct. Campium, Presl. Pcecilopteris, Presl. Jenkinsia, Hook.) 



1. Cyrtogonium rivulare, Sp. Nov. (Tab. 11.) 



C. rhizomate repente; stipitibus angularibus paleaceis; frondibus membra- 

 naceis gldbris oblongis attenuatis basi pinnatis versus apicem sinuato- 

 pinnatifidis, fertilibus minoribus ; pinnis integris oblongo-lanceolatis 

 eel ovatis obtusis subfalcatis apice proliferis. 



Hab. Ovolau, Feejee Islands : banks of streams, on wet rocks, in 

 shady places. 



Rootstock creeping, about the thickness of a goosequill, and palea- 

 ceous; the palese reticulate, ovate-oblong, attenuate, dentate. Stipes 

 angular, slightly furrowed, 4 to 5 inches long ; that of the fertile frond 

 12 to 14 inches long, and, together with the rhachis, bearing slender 

 rufous paleo3. Sterile fronds 8 to 10 inches long, smooth and mem- 

 branaceous, oblong, attenuated, the base pinnate, towards the apex 

 sinwxto-pinnatifid, the latter with the obtuse points of the pinnae proli- 

 ferous. Fertile fronds small, not exceeding 4 inches in length, with 

 the points of the pinnce oblong-lanceolate or ovate, more rounded than in 

 the sterile ones. Sporangia of a pale straw-colour, concealing the 

 whole of the under surface. 



Plate 11. — Fig. 2. Plant, of ftie natural size. 2 a. A scale from 

 the stipe. 2 b y b. Sporangia. — Magnified. 



22 



