﻿IS. OLEATVDI^A., Cavanilles. 



Sori on the back of the veins, rarely ± medial, generally near the cosla. 

 Indusium reniform, firm, fixed by the sinus. 



Rhizome creeping, scandent or erect, branched. Fronds simple, articulate to 

 the rhizome; veins free, compact. Hk. Bk., Syn. Fil., tab. V, fig. 46; Diels, in 

 Engl. & Prantl, Nat. Pfl.Fam., l\ fig. 109 {'). 



Pantropical. 



1. Rhizome scandenl or erect (^). 



2. Sori medial on the veins. (1) 0. cuspidata. 



2.3. Sori near the costa. 



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



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



A. Stipes articulate at the apex, the joint close to the base of 



the lamina. (3) 0. colubrina. 



■J.J. Stipes articulate below the apex or towards the base, the 



joint not close to the base of the lamina. (4) 0. neriiformis. 



±.1. Rhizome creeping. 



a. Cosla naked or hairy beneath. 

 h. Stipes articulate at the base. 



c. Sori somewhat distant from the costa. (5) 0. musifolia. 



c.c.Sori close to the costa. (6) 0. Wallichii. 



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



$. Rhizome scales + adpressed. Stipes articulate between the 

 base and the apex. (7) 0. Cumingii. 



$.§. Rhizome scales spreading. Stipes articulate at the summit. 



(8) 0. tricholepis. 

 a.a. Cosla scaly beneath. (9) 0. Whitmeei. 



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

 be considered as varieties of 1 or 2 species united by several intermediate forms, vvich are 

 often difficult of determination. 



{'J See also O. musifolia, Pr. 



