118 21. ADIANTUM, § EUADIANTUM. 



18. A. trapcziforme, L. ; st. 6-12 in. 1., firm, erect, naked, polished, blackish ; 

 fr. with a, c:iitra,l/jj»Ba 4-8. in. 1., 2-3 in. br., and 2 to 4 large spreading ones on 



each side, the lowest of which are often branched again; segm. \\-2 in. 1., 

 ^- j in. br., dimidiate, the sides nearly parallel, the outer edge oblique, both it 

 and the upper one bluntly, not deeply lobed, the lowest on stalks J-^ in. 1. ; tescture 

 papyraceo-herbaceous ; rachis and both surfaces naked ; sori numerous, con- 

 tiguous, transversely oblong, placed round the upper and outer edge. — Hk. Sp. 2. 

 p. 33. Hk. & Gr. t. 98. — 13, A. pentadactt/lon, L. & F. ; lower margin of the 

 segments somewhat decurved obliquely from the petiole. — y, A. cultralvm, 

 3. Sm. ; outer edge of the segment bluntly rounded. — Hk. Sp. 2. p. 34. 



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

 well-known plant, readily distinguished from its neighbours by its ample trapezoid seg- 

 ments. A. CaiAermcB of the gardens appears not to differ materially. 



19. A. polyphyllum, Willd. ; st. 12-18 in. 1., strong, erect, blackish, polished, 

 rather scabrous; fr. 2-3 ft. 1., 12-18 in. br., the upper part simply pinnate; 

 lower pinruB sometimes 1 ft. 1., 6 in. br., with a long terminal and numerous 

 erecto-patent lateral pinnules ; segm, \-\ in. 1., \ in. deep, dimidiate, the upper 

 and lower edge nearly parallel, the point bluntly rounded, the upper edge 

 sharply but not deeply toothed ; taseture coriaceous, veins prominent ; rachis and 

 surfaces naked ; sori in numerous suborbicular patches placed in hollows in lobes 

 along the upper edge. — Hk. Sp. 2. p. 49. A. cardiochlaena, Kwnze, Hk. Sp. 2. 

 p. 60. t. 83. A. A. Matthewsianum, Hk. Sp. 2. p. 35. t. 84. A. A. macro- 

 eladum, Klotzsch, Hk. Sp. 2. p. 49. t. 83. B. 



Hab. Columbia and Peru. — A large copiously-branched plant, with very numerous 

 (sometimes fifty to a pinna) closely-placed subsessile, segments. A. tomentomm,, Klotzsch 

 \A. Klotzscliianwm, Hk.), and A. urophyllv/m, Hk,, seem forms of this with slightly- 

 pubescent rachises. 



20. A. glaucescens, Klotzsch ; st. 6-9 iii. 1., slender, erect, naked, polished ; 

 fr. 1 ft. each way, with a terminal pinna and several loosely-spreading ones on 

 each side ; pinnl. j-1 in. 1., J-f in. deep, dimidiate, the lower border nearly 

 straight, the upper nearly parallel with it, almost entire, the outer margin 

 bluntly rounded, the lowest on short stalks ; texture papyraceo-herbaceous ; 

 rachises naked, under surface glaucous ; sori in numerous patches, 1-1^ lin. 

 br., with a space between them, placed round the upper and outer edge. — 

 Hk. Sp. 2. p. 26. 



Hab. Ecuador, Guiana, and north of Brazil. — Perhaps this also is not distinct from 

 A . polyphyllvm, but it is less copiously branched, and the segments are fewer and thinner 

 in texture. 



*** Ultimate segments dimidiate, the stems pubescent, Sp. 21-31. 



21. A. Henshvianum, Hk. fil. ; st. 6-12 in. 1., erect, dark chesnut-brown, naked, 

 glossy ; fr. 12-18 in. 1., 6-9 in. br., ovate tripinnate, furnished with numerous 

 distant pinnw on each side, the upper of which are simple, but the lowest slightly 

 branched ; segm. ^-| in. br., :|-f in. deep, dimidiate, the lower line nearly straight, 

 the upper rather rounded, a good deal lobed, the point bluntly rounded ; tescture 

 j)apyraceo-herbaceous ; rachis and under surface hairy; sori obversely reniform, 

 placed in the hollows of the lobes of the upper and outer edge. — Hk. Sp. 2. p. 43. 

 A. sessilifolium, Hk. p. ii. A. Reichenbachii, Moritz. A. laetum, Mett. 



Hab. Columbia, Peru, Galapagos group.— This is well-marked amongst its neighbours 

 by the shape of its segments, the inner edge of which is often imbricated over the rachis, 

 as in il . Shepherdi and concvrvn/wm, and by the reniform sori which encircle a very distinct 

 hollow. 



22. A. cristatum, Ii. ; st. 6-12 in. 1., strong, erect, tomentose ; fr, l|-3 ft., 1. 



