xcvii. 



coriaceous, distinct from the substance of the frond ; the outer 



valve larger cucullate, the inner operculiform. Veins forked or 



pinnate from a central costa ; venuUs free. 



Fronds large, decompound. Khizome thick, short, decumbent, 



or erect. This genus, like Dicksonia, has two-valved indusia; 



but in the present, the texture of the two valves is alike, and 



evidently different from that of the frond, on the extreme 



margin of which they are borne. 

 Ex. : C. Barometz, J. Sm. \ C. assamica, Book. 



C. Schiedei, Schlech. C. Chamissoi, Klf* 



C. glaucum, Hk. and Arn. \ C. Menziesii, Hook, 



(b) Indusivm cup-shaped, reflexed. 



186. DENNST.ZEDTIA, Eernhardi, Schrad. Journ. 1800, 

 ii. 124, t. 1, f. 3. 



DICKSOXIA, Kaulfwi : Presl ; SITOBOLUJII, Desvaux; PATANIA, Presl ; 

 SiiotOBiuM, J. Smith; ADBCTUM, Link ; DEPABI.X sp., Hooker; Potr- 

 PODII sp., Auct. ; CYATHB.S sp., Auct.; TBICHOUASIS &p.,Aiict.; NEPH- 

 BODII sp., Auct. 



Sori involucrately-indusiate, globose, marginal, reflexed; the 

 receptacles small punctiform, terminal. Indusium cupuliform 

 or pateriform, sub-membranaceous, the special and accessory 

 valves nearly equal, and coalescing into an almost entire, rarely 

 sub-bilabiate, reflexed cup. Veins pinnate, from a central costa ; 

 venules simple or forked, free. 



Fronds herbaceous, bi-pinnate or decompound; the sori ex- 

 serted within the cup-shaped involucriform indusia, and reflexed. 

 Ehizome creeping. A group quite distinct in habit from Dick- 

 sonia, and also differing in the sori being seated within cup- 

 shaped indusia, which are almost or quite entire, instead of 

 distinctly two-valved. The cup, which is formed by the conflu- 

 ence of the special and accessory indusia, is sometimes, but 

 rarely, slightly notched at the sides when this confluence is not 

 quite perfect; these instances showing its affinity with Dicksonia. 



Ex.: 



