

XTX1V. GENEBA OF TEENS: 



aa extrorse-marginal furrow, i.e., a groove open exteriorly in the 

 extreme margin of the frond. Veins obscure, simple, combined 

 at their apices by the receptacle. 



Fronds simple and coriaceous, narrow-elongated and grass-like. 

 Ehizome short, creeping, or tufted. A group quite distinct in 

 technical characters, but closely approached in aspect by some of 

 the narrow-fronded species of Taniopsis. The fronds are mostly 

 long and very narrow, like stiff blades of grass. 



Ex. : V. rigida, Klfi. \ V. isoetifolia, Bory. 



V. zosteraefolia, Bory. \ V. anodontolepis, Fee. 



LINDS.EE.E. 

 (a) Veins free (except where combined by the receptacle.) 



39. LINDS.SJA, Dryander, Trans. Lin. Soc. Land. iii. 40, 

 t. 710 ; Smith, Mem. Acad. Turin, v. 413. 



ISOLOMA, J. Smit h ; LINDSAYN IUM, Fee ; LINDSAYA, Kaulfuss; ADIASTTI 

 sp., Auct.; VITTABI.* sp., Auct.; WIBBLIJB sp., Fee; I ) \ \ \ i, i, i /ic sp., Spreng. 



Sori indusiate, linear or oblong, continuous or interrupted; 

 the receptacle sub-marginal. Indusium membranaceous, equalling 

 or shorter than the margin of the frond, opening on the exterior 

 ide. Veins ecostate and flabellately forked, or forked from a 

 central costa ; venules straight, combined at their apices by the 

 receptacle, otherwise free ; sometimes thickened at their apices. 



Fronds herbaceous or sub-coriaceous, simple pinnate or bi- 

 tri-pinnate ; the pinnae (or pinnules) sometimes articulate, dimi- 

 diate or equal-sided ; fertile only on the upper margin, or on 

 both margins. Rhizome creeping. In Lindsaynium the veins 

 coalesce with a thickened margin, not a marginal vein. Isoloma 

 has a central costa, articulated pinnse, and clavate veins, but 

 cannot be separated without also involving the separation of 

 the isomerous Adianti. 



Isoloma. Divisions of the frond isomerous, with a midrib. ' 



Ex. : L. lanuginosa, Wall. I L. divergens, Hk. and Or. 



L. Walker*, Hook. \ 



Eulindtaia. Divisions of the frond flabellate or dimidiate, ecostnte. 

 Ex. : L. reniformis, Dryand. I L. microphylla, Sw. 



L. quadrangularis, Raddi. \ L. retusa, Mett. 



