r.iNLis.KA. 203 



anlerior or sujierior one licMjueiitly, liowcver, broader than the iiiltrinr, 

 the inner one ajipcaring in that case to be intraniarginal. 



1. LiNDS.KA, Dri/. 



Isoloxiia, J. iSiH. Scliizoloraa, Gaud. Sjiuiphlcbiuni, .7. Sm. 



Sori marginal, double, continuous or intcrrui)lc(l. J/t- 



rolucrc opening outwardly, Ibrnicd of 2 linear membranes, of 



which the inlerior mav be considered accessory, uniting 



the apices of '2 or more veins. — Tropical or subtropical 



Ferns, willi frequcnih/ a creepinif caudex. Fronds slipitaie, 



simple or rariousli/ dirided. Piunic equal or dimidiate. 



Veins free or siiiipli/ anasiomosiu<j (without reiulets iu the 



areola;) Costa ceutral or e.vceutric, or n-autiuq. (Hook. G en. 



FiL. Tab. JAIII. A. and B.,Tah. CII. and Tai?. CI.) 



Subgen. I. Eulindsa^a. I'eiiis simple or forked. Lindstea (tud 



Isolonia. J. Sm. — Sj). 1 — 47. 



* Fronds siin}>le. 



1. L. reiiiformis, Dry. ; fi-ond situ])le subcoriaceous orV)i- 

 culari-renilbrm with a deeji sinus. — Dry. iu Liiiu. Traus. iii. 

 p. 40, /. 7, /: 1. Su: Syu. FiL p. 118. " Milld. Sp. PI. v. p. 

 4-20. Kze.'iu Schkh. Fil. Sup pi. t. 16,/. 2. 



Hab. Trencli Guiana, Ale.v. Anderson, {Dri/andcr). British Guiana, 

 Schombur(jk,n. .'y'.V.i. — Caudex short, creeping. Hoots fibrous, wiiy. Sli- 

 pites a span high, somewhat tufted, ebony bhick. Fronds 2 — 3 inches in 

 diameter : vc ins radiating, dichotomous ; in one of my specimens 2 branches 

 of the veins sometimes converge, tlius anastomosing. Involucre continuous 

 round the whole margin to a little distance from the sinus. 



2. L. saffittdla, Dry. ; frond simple submembranaceous 

 broadly ovato-sagitlalc acuminate. — Drq. iu Liun. Traus. iii. 

 p. 40. Sw. Syu. Fil. p. 118. Willd. Sp. PI. v. /;. 420. Hook, 

 et Grev. Ic. Fil. i. 87. — Adianlura &c. Aubl. Guyau, ii. p. 

 964, t. 366. 



Hab. French (ruiana, Auhlet. Ouadaloupe, {Sprengcl) — A very rare 

 species and quite distinct from the preceding one. Fronds more membra- 

 naceous, acuminated at the point and at the two deflexed lobes. Involu- 

 cre everywhere continuous except at the point and the sinus, accessory one 

 distant from the margin. 



** Fronds pinnate. — Sp. 3 — 2.5. 



f Cosla cvcenlric or muniinal, or obsolete. Sori on the superior niaryin of 



the vnet/ual pitma. Lindsa^a, ./. Sm. Sp. 3 — 22. 



3. h.cultrata, Sw.; caudex creeping, fronds i)innatc long- 

 lanceolate, pinna.^ submembranaceous horizontal ovate, the 

 upper base truncate rather acute slightly arcuate at the up- 

 per margins the apex (usually) directed u])wards, shortly and 

 rctuscly lobed, the lobes bearing the oblong sori, stipes and 

 rachis generallv ])ule brown, the former occasionally black. — 

 Sw. St/u. Fil. 'p. Il!>. ]\'ilhl. Sp. PI. V. p. i-2-2. Sihhh. Fit. 



