17. TRICIIOMANES, EUTRTCHOMANES. 81 



ft Main rachis hardly, if at all, winged in the lower part. Sp. 48-57. 



48. T. Filicula^ Bory ; rhizome wide-creeping, tomentose, rather slender ; st. 1-2 

 in. 1., naked, slightly winged above ; fr. 1-4 in. I., 1^-2 in. br., ovate, tripinnatifid," 

 main rachis with a very narrow wing or free below ; pinnae ovate-rhomboidal, 

 pinnatifid down to a narrowly-winged rachis ; the lower pinnl. again deeply 

 pinnatifid ; ultimate segm. linear ; texture firm, memhranaceous ; a central costa 

 in each segment, spurious venules none or indistinct ; sori 1 to 4 to a pinna, 

 axillary or terminal on the segments ; tube sunk or somewhat exserted, the 

 mouth very distinctly two-lipped, the lips subtriangular with a rounded apex. 

 Hk. Syn. \.p. 124. Didymoglossum, Desv. /3, T. tate-alatum, V. D. B. ; ultimate 

 segments very narrow and acute, wing of rachis somewhat crisped, spurious 

 venules distinct. V. D. B. Suppl. l.p. 54. D. plicatum, V. D. B. 



Hab. Mauritius, Bourbon, Madagascar, Natal, Cape Colony, and Fernando Po ; 

 Nepaul, Assam, Japan, N. Hindostan, Ceylon, Java, Borneo, and Polynesian Islands. 

 Very like T. pyxidiferum in habit, and principally distinguishable by the distinctly two- 

 lipped involucre. It was formerly supposed that one of them was confined to the New, 

 the other to the Old World ; but T. pyxidiferum has now been found abundantly in Asia, 

 Africa, and the Polynesian Islands ; and I cannot distinguish from this, though labelled 

 pyxidiferum on high authority, a Mexican plant from Liehmann. Here are included 

 numerous species of Van den Bosch ; amongst which are his Didymoglossum Draytonia- 

 num, euphlebium, Qriffithii, racemulosum, insigne, capillatum, and dilatatum. 



49. T. pyxidiferum, L. ; rhizome wide-creeping, tomentose, rather slender ; st. 1-2 

 in. L, naked, winged above ;fr. 1-6 in.L, 1-1| in. br., ovate-oblong, tripinnatifid, 

 main rachis with a very narrow wing ; pinnae ovate-rhomboidal, pinnatifid down 

 to a narrowly-winged rachis, with the lower pinnl. again deeply pinnatifid ; 

 ultimate segm. linear, often emarginate at the apex ; texture membranaceous ; a 

 central costa in each segment ; spurious venules none or indistinct ; sori 1 to 4 to 

 a pinna, axillary, tube more or less winged, mouth broadly dilated but scarcely 

 two-lipped ; recept. filiform, exserted. #. Sp. I. p. 124. Hk. & Gr. Ic. Fil. t. 

 206. /3, T. emarginatum, Presl ; more divided, the segments of the pinnules 

 numerous and crowded. T. cavifolium, C. Muller. y, T. olivaceum, Kunze ; 

 segments broader, less divided, wing of rachis somewhat crisped, spurious venules 

 distinct. 



Hab. Tropical America, from Mexico and the West Indies southward to Brazil and 

 Peru ; Bourbon, Cape of Good Hope, Angola, Fernando Po, Hindostan as far north as 

 Khasia, Moulmein, Borneo, and New Caledonia. Our a corresponds to numerous 

 species of Van den Bosch, including his hymenophylloides, Lechleri, JBrasiliense, Borboni- 

 cum, Milnei, Vieillardi, eximium, and Sclimidtianum. 



50. T. radicans, Swartz ; rhizome wiry, wide-creeping, tomentose ; st. strong, 

 wiry, ascending, 2-6 in. 1., naked or nearly so, sometimes the upper part winged ; 

 fr. 4-12 in. 1., 2-6 in. br., tripinnatifid, main rachis very narrowly winged, often 



free, except near the apex ; lower pinnae 1-4 in. 1., ovate-rhomboidal, cut down 

 to a narrowly-winged rachis ; pinnl. again deeply pinnatifid, ovate-rhomboidal, 

 with deeply toothed lower segm. ; texture membranaceous but firm ; a single vein 

 only carried into each ultimate segment ; sori lateral, 1 to 4 to a pinnule, the 

 tube small, subcoriaceous, more or less decidedly exserted, the mouth very 

 slightly two-lipped; recept. slender, elongated. Hk. Syn. I. p. 125, non Hk. c$- 

 Gr. Ic. Fil. t. 218. Hk. Brit. Ferns, t. 42. T. speciosum, Willd.^ T. 

 Kunzeanum, Hk. ; fr. 12-18 in. L, subcoriaceous, main and secondary rachises 

 hardly at all winged ; pinnae distant stalked, pinnules deeply pinnatifid, the 

 lowest lobes again pinnatifid, the segments very long and narrow. Hk. Syn. 1, 

 p. 127. t. 39. D. T. Antillarum, V. D. B. T. umbrosum, Wall.y, T. Luschna- 

 tianum, Presl \fr. lanceolate acuminate, quite sessile. Hymenophyllum rupestre, 

 Raddi. 



