XXXIT. OENBEA OP TEENS: 



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



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



at tbeir apices by the receptacle. 



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



Rhizome 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, Klfg. I V. isoetifolia, Bary. 



V. zosterffifoUa, S&ry. \ V. anodontolepifl, F^e. 



§ LlNDSiEE^. 

 (a) Veins free (except where comiined iy the receptacle.J 



39. LINDS^A, Bryander, Trans. Lin. Soc. Land. iii. 40, 

 t. 7 — 10 ; Smith, Mem. Acad. Turin, v. 413. 



IsoLOMA, J. Smith.; LiNDBATiriTrM, Tie; Lindsata, Kaidjhtss; AniANTI 



8p.,j4»ct,; VlTXAEIjESp., jiiWrf.; WlBELLffi 8p., JPi^ej DaT ALLI^ Sp., ^pTfin^. 



Sori indusiate, linear or oblong, continuous or interrupted; 

 the receptacle sub-marginal. Indusivm membranaceous, equalling- 

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

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

 central oosta ; 'oenules 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 pinnse (or pinnules) sometimes articulate, dimi- 

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

 both margins. Rhizome creeping. — In lAndsaynium, the veins 

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

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

 cannot be separated without also involving the separation of 

 the isomerous Adiamti, 



§ laoloma. — Divisions of the frond isomerous, with a midrib. 



Ex. : L. lanuginosa. Wall. I L. divergens, Mk. and Cfr. 



L. Walkerse, Sook. \ 



§ MuliTidaisa. — Divisions of the frond fiahellate or dimidiate, ecostate. 

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



L, quadrangnlaris, Saddi. | L. retusa, Meft. 



