21. ADIANTUM, EUADIANTUM. 119 



9-12 in. br., with a terminal central pinna 6-9 in. 1., 1-1^ in. br., and numerous 

 rather distant lateral ones on each side, the lowest of which are sometimes again 

 branched ; segm. ^-f in. 1., J- in. br., dimidiate, the lower line nearly straight, 

 the upper nearly parallel or rounded, the point blunt, texture coriaceous ; rachts 

 tomentose ; sorzin several oblong or linear patches round the upper and outer 

 edge. Hie. Sp. 2. p. 46. A. Kunzeanum, Klotzsch. HJc. Sp. 2. p. 47. 



Hab. West Indies and Venezuela. This species and the two next are distinguished 

 from their neighbours by their smaller and more rigid segments. They bear the same 

 relation to A . tetrapliyllum that Lindsaya stricta bears to L. Guianensis and trapeziformis. 



23. A. obtusum, Desv. ; st. 6-12 in. L, wiry, erect, polished, blackish, slightly 

 tomentose ; fr. with a terminal and several pairs of erecto-patent lateral pinnae ; 

 pinnl. ^-if in. br., l|-2 lin. deep, subdimidiate, the lower line nearly straight, 

 without sori, the upper bluntly rounded, nearly entire, placed close, and the 

 lower slightly stalked ; texture coriaceous, venation flabellate ; rachis often 

 densely tomentose ; sori in numerous close transversely oblong patches round 

 the up'per and outer edge. Hk. Sp. 2. p. 19. Hk. & Gr. t. 188. p, A. Kunzei, 

 Miquel ; pinnules larger, sometimes ^-f in. br., in. deep. 



Hab. West Indian Islands and Panama southward to Peru and Rio Janeiro. This 

 comes very near in habit and texture to A. cristatum, from which it may be best known 

 by its closer, more numerous, and shorter sori. A plant gathered by Barter in the 

 Niger Expedition appears to agree with the copious American specimens. 



24. A. hirtmn, Klotzsch ; st. 6-9 in. ]., wiry, erect, polished, dark chesnut- 

 brown, tomentose ; fr. with a terminal and several pairs of erecto-patent lateral 

 pinnce ; pinnl. ^-\ in. br., 1^-2 lin. deep, dimidiate, the lower line straight and 

 barren, the upper bluntly rounded, finely toothed, placed close, and the lower 

 slightly stalked ; texture subcoriaceous ; venation fine, prominent, under surface 

 slightly and rachis very tomentose ; sori transversely oblong, placed in small 

 lobes of the upper and outer margin. Hk. Sp. 2. p. 20. t. 82. A. 



Hab. Tropical America, from Panama and Guiana southward to Peru and Brazil. 

 This is more closely and regularly branched than the two preceding, with the segments 

 longer in proportion to their breadth, and the sori very close, small, and numerous. 

 A. gracile, Fe*e, which I have not seen, seems near this. 



25. A.formosum, R. Br. ; st. 12-18 in. L, strong, erect, scabrous ; fr. 18-24 

 in. L, 12-18 in. br., tri- or even quadripinnate ; lower pinnce 12-15 in. L, 6-9 in. 

 br., deltoid ; pinnl. deltoid ; ult. segm. J-| in. br., If -2 lin. deep, dimidiate, the 

 lower edge straight, the upper rather rounded and deeply lobed, the outer also 

 oblique and lobed, the lower ones distinctly stalked ; texture subcoriaceous ; rachis 

 glossy, scabrous ; sori numerous, between obreniform and transversely oblong, 

 placed at the edge of the lobes along the upper and outer margin. Hk. Sp. 2. 

 p. 51. t. 86. B. 



Hab. Temperate Australia and New Zealand. This has pinnules as small but not 

 nearly so thick and rigid as in the three preceding. It comes from a different part of the 

 world, and the ample compound pinnae will at once distinguish it from all its allies. 



26. A. Cubense, Hk. ; st. 4-6 in. 1., polished, blackish, naked, erect ; fr. 6-9 

 in. L, 1-lf in. br., simply pinnate, or with a single pair of short erecto-patent 

 branches ; pinnl. f in. br., in. deep, unilateral, the lower line slightly recurved, 

 the upper rounded and broadly lobed, the outer edge blunt, lowest short-stalked ; 

 texture pellucido-herbaceous ; rachis slightly pubescent ; sori in shallow hollows 

 of the lobes, 1-1^ lin. br. Hk. Sp. 2. p. 28. t. 73. A. 



Hab. Jamaica and Cuba. This species is marked by the simple or slightly-branched 

 stem and character of the sori, which are not more than five or six in number, and placed 

 in the centre of distinct hollows along the upper and outer edge. 



