X5. OTuEA^TSiyEtA^, Cavanilles. 



Sori on the back of the veins, rarely + medial, generally near the a 

 iium reniform, firm, fixed by the sinus. 



Rhizome creeping, scandent or erect, branched. Fronds simple, articula 

 •hizome; veins free, compact. Hk. Bk., Syn. Pil., tab. V, fig. 46; Diel 



& Prantl, Nat. PH.Fam., I", fig. 109 (»). 

 Pantropical. 



Rhizome scandent or erect (^). 



*. Sori medial on the veins. (1) 0. cuspic 



3.8. Sori near the costa. 



3. Rhizome scales ciliate, the ciliae cobwebby. (2) 0. cil 



3.3. Rhizome scales at best ciliate when young, the ciliae short. 

 A. Stipes articulate at the apex, the joint close to the bat 

 the lamina. (3) 0. colub: 



A.S:. Stipes articulate below the apex or towards the base 

 joint not dose to the base of the lamina. (4) 0. neriifoi 

 Rhizome creeping. 

 a. Costa naked or hairy beneath. 

 h. Stipes articulate at the base. 



c. Sori somewhat distant from the costa. (S) 0. musi; 



c.v. Sori close to the costa. (6) 0. Walli 



b.b. Stipes articulate above the base or towards the apex. 



S. Rhizome scales ± adpressed. Stipes articulate belweei 



base and the apex. (7) 0. Cumi 



§.$. Rhizome scales spreading. Stipes articulate at the summ\ 



(8) 0. trichol 

 Costa scaly beneath. (9) 0- Whiti 



a.u. 



') Most of the species are more or less variable and so closely allied that Ihey 

 )nsidered as varieties of 1 or 2 species united by several intermediate forms, wic 

 difficult of determination. 

 "} See also O. maslfolla, Pr. 



