24 CYATIIEA. 



Oils frequently twice or even thrice forked, sori occupying 

 most of the segment at some distance from the costa, invo- 

 lucre membranaceous durable but bursting very irregularly. 

 (Tab. XI. B.) Spr. Sijst. Ve(/. v. iv. p. 126. C. Borbonica, 

 Poh: C. Mascarena, 'Sw. Map. Nat. Berl. 1811, w. 328 {ac- 

 cordituf to Desvanx). — /3. rachis very dark-colored. C. me- 

 lanocaula, ])esv. — y. latifolia ; pinnules a foot long, 3 inches 

 broad, pinnated almost to the summit. (Tab. XIII. A). 



Hab. Isles of France and Bourbon {Poiret), Bojer, Sieber {S'l/n. Fil. n. 

 5J), and Fl. Mixta n. 305). Madagascar, Desvaux. — y. iNIauritius, Bojer, 

 Sieber (Fl. Mixta n. 304). — A very distinct species, of which Prof. Bojer 

 says tliat the caudex is much shorter than in the following (C. exceha), and 

 the frond far broader and thicker. It is the finest of the genus with 

 wliich I am acquainted; the pinnules being 8 — 10 inches long and 2^ inch- 

 es broad in the usual state of the plant ; but some are more than a foot long 

 and 4 inches broad, as in our var. y. Sometimes the stipes and rachis be- 

 come black, probably the effect of age, and then it is the C. melanocaula, 

 Desv. 



30. C. e.vcelsa, Sw.; unarmed, fronds bipinnate rather mem- 

 branaceous but firm, pinnules glabrous lanceolate much acu- 

 minated pinnatifid pinnate at the base, segments oblong, ob- 

 liquely subacute serrated destitute of scales, veins simply 

 forked below the middle, sori near the costa, involucre mem- 

 branaceous glossy very fragile bursting irregularly often into 

 lobes rarely bifid. (Tab. XII. B.)—Stv. Si/n. Fil. p. 140 and 

 p. 367. Pr. Tent. Pterid. lab. 1. ./: 15.' C. arborea, Bori/, 

 {not Sm.) 



Hab. Bourbon, Bori/, Curmichael. jNIauritius, Bojer. — Stipes and rachis 

 pale. Fronds, when dry, rather dark green, not verging to brown. Nerves 

 very slender, but little prominent, one-" forked below the middle, and the 

 sori are by no means so near the costa as in the following very distinct spe- 

 cies. Swartz doubts, however, if this be really dislinct from C. vieduUaris. 



31. C. Wo I ker<e, Hook. ; unarmed, fronds bipinnate, pin- 

 nules thick firm very coriaceous, deeply pinnatifid pinnate 

 below, segments and ultimate ])innules (the latter contracted 

 at the base) oblong very obtuse, entire or slightly crenate of- 

 ten scaly (scales deciduous) on the costa beneath, veins co- 

 pious sunk forked at the very base often again about half way 

 up, sori occupying the lowest fork close to, almost u])on, the 

 costa, involucres large opaque bursting as it were on the su- 

 perior side only reflexed upon the costa and partially cover- 

 ing the sorus in the form of a broad bifid hood. Hook. Ic. 

 PI. V. vii. /. C47. 



Hab. Adam's Peak, Ceylon, Mrs. Col. Walker. — An extremely well- 

 marked species, of which I have received copious specimens from Mrs. 

 Walker, and from that lady alone. The stipes and main rachis are of a 

 mahogany colour, much flattened and slightly grooved when dry above, and 



