ICvi. GENEEA OF FEEN8 : 



by the sinus. Veins forked or pinnate, from a central costa ; 

 venules free, terminating within the margin. 



Fronds herbaceous, bi-pinnate, the sori entirely occupying the 

 small projecting marginal teeth. Rhizome? ...... The 



structure of this plant appears to us unlike that of any estab- 

 lished genus. The sori, though not stalked, project from the 

 margin, and entirely occupy the small marginal lobes, thus pro- 

 ducing in general aspect a similarity to Deparia; but instead 

 of being an extrorse-marginal cup, as in that genus, this project- 

 ing body here consists of two flat valves. These valves we regard 

 as analogous to those of Dicksonia, from which, however, the 

 present plant differs in the larger size of the inner valve, 

 and in both valves lying flat in the plane of the frond open 

 round the margin (like a bi- valve shell), instead of being reflexed 

 so as to stand at a right angle with the plane of the frond. 



Ex. : D. deparioides (Ceylon, Hb. Perad. 3062.) 



.134. (?) P.S3SIA, St. ffilaire, Voy. Distr. Eiamans, i. 381. 



Sori sub-rotund or linear, sub-marginal, at first enclosed in 

 the indusium. Indusium plane, membranaceous, thin, double or 

 two-valved; the accessory valve growing from the margin, the 

 special smaller sub-orbicular, at length reclinate. Veins pinnate 

 free. 



Fronds large, tri-pinnate, glandular-pubescent; pinnules spread- 

 ing; the aspect of Pteris, We know nothing of this plant, 

 which, according to St. Hilaire, is certainly related to Dicksonia. 

 He, however, compares the aspect of the plant with Pteris, and 

 the sori with Adiantum. 



Ex.: P. viscosa, St. mi. 



135. CIBOTITJM, Kaulfuss, Serl. Jalvrl. der Ph. (1820) ; 

 Id., Emm. Fil. 229, t. 1. 



Qaudichaud; HIATEA, Hfenzies MS (Hook. Sp. Fil.); DICK- 

 SONUS v.,Auct. ; BALANTII 8p.,Auct. ; ASPIDII sp.,Auct.; POLYPODII 

 sp., Auct. 



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

 the receptacles slightly elevated, terminal. Indusium two-valved, 



