DIOKSONrE^. — PEEAlfEME*. ICII. 



elongated costal areoles, the rest uniting in unequal oblong hex- 

 agonal areolea, with here and there an included free vemlet; 

 marginal veinlets icee, those opposite the teeth exourrent, and 

 bearing the sori at their extremity. 



Fronds pedately bi-pinnato-pinnatifid, membranaeeo-herbace- 

 ous. Ehizome short, decumbent. — This genus differs from De- 

 paria in the distinctly reticulated veins ; it is also quite unlike it 

 in general aspect. 

 Ex. : C. Moorii, T. Moore (Deparia, Sooher.) 



§ 23 Peeaiteme^. 



(a) Veins free. 

 * Involucres stallied. 



139. PEEAITEMA, Don, Frod.M. Nep. 12. 



Sph^bopteeis, WoXlich ; S, Brown (non Semha/rdiJ ; FosErLEMA, S. 

 Brown MS. ; Wematopeha, Kunxe. 



Sori involucrate, globose; the receptacles globose, stipitate, 

 medial on the lower anterior yenules. Involucre coriaceous, 

 stalked, globose, entire, at length bursting Tertically into two 

 irregular valves. Veins forked or pinnate, from a central costa ; 

 venules free, thickened at the apex. 



Fronds tri-pinnate, herbaceous, the stipes and rachis densely 

 clothed with spreading scales. Ehizome large, globose. — Don's 

 name for this genus has unquestionably priority of publication. 

 It cannot be set aside on the personal grounds referred to by Dr. 

 Wallich, nor on the more forcible and technical objection he has 

 urged, of its similarity to Feronema, for there are numerous 

 instances of generic names equally resembling other names, being 

 admitted without question; nor does there appear any special 

 reason for the change in the present instance. 



Ex, : P. cjatheoides, Hon. 



* * Involucres sessile. 



140. DIACALPE, Slume, Unum. PI. Jam. 241. 



AspiDll Bp., WalUch.', Physematu sp., Kvmze i Cystopteeidis sp,, 

 Fresl ; Cyathe^ sp., Mettenius. 



Sori involucrate, globose ; the receptacles punctiform medial 



