xl. 6ENEEA OP PEEKS: 



marginal twin fructifications, which though not universally 

 double, are commonly so. 



Ex. : C. pinnata, Klfs. \ C. gleichenioides, Gardn. 



C. triphylla, Klf. \ C. petiolata, Fee. 



(d) Sori intramarginal, medial on the veins. 



48. PLECOSOBUS, Fee, Gen. Fil. 150. 



CBYPTOSTISMA, A. Braun MS. ; CHEILANTHIB sp., A, Braun olim, and 

 Auet. 



Sori (spuriously) indusiate, i.e., covered by the continuously 

 inflexed slightly attenuated or scariose margin of the segments ; 

 rotundate, intramarginal, seated among hair-like scales, becoming 

 effuse ; the receptacles prominent, medial. Veins forked from a 

 central costa, indistinct ; venules free. 



Fronds large, pinnato-pinnatifid, densely scaly beneath. The 

 ferns referred to this group differ from Cheilanthes in having 

 distinctly intramarginal medial, instead of marginal terminal sori. 

 They approach very near to Jamesonia, in company with which 

 they might perhaps be placed without violence to nature. We 

 retain them among the CheilantAece, in consequence of the 

 transverse marginal though scarcely more than spurious 

 indusium, which is analogous to what occurs in some species of 

 Cheilanthes. 



Ex. : P. peruvianus, Fie. \ P. speciosissimus (Cheilanthes, A.SrJ 





 (a) Veins free. 



49. ONYCHIUM, Kaulfuss, Serl. Jahrb. Pharm. 45 ; Id. 

 Enum. Fil. 144, 1. 1. 



LKPTOSTKGIA, D. Don; TKICHOMANIS sp., Thunlerg ; C^WOPTERIDIS sp., 

 Thunberg ; ~D^s.siK sp., Willdenow ; PHOEOLOBI sp., Deivaitx; CHBIL- 

 AHTHis sp., Auct.; ALLOSOKI sp., Presl; PTEEIDIS sp., Auct.; LOHARIJB 

 sp., Auct. ; LOMABIOBOTETDIS sp., Fee ; ASPLEHII sp., Kunze, 



Sori indusiate, linear (or oblong) transverse marginal or sub- 

 marginal ; the receptacles continuous. Indusium linear (or 

 oblong), membranaceous, usually opposite, and while young 



