60. ACROSTICHUM. 403 



Hab. Trinidad and Guiana. Differs only from A. latifolium by its blunter fronds of 

 subspathulate outline, with the edge slightly scaly. 



18. A. Sieberi, Hk. & Gr. ; rhizome stout, woody, the scales ^ in. ]., linear- 

 subulate, nearly black ; st. 3-6 in. 1., firm, erect, stramineous, hardly at all 

 scaly \ fr. 3-12'in. 1., 1-3 in. br., the lower part narrowed very gradually, the 

 edge cartilaginous, entire ; texture coriaceous ; veins immersed, usually once 

 forked ; fertile fr. smaller than the barren one. Hk, Sp. 5. p. 197. H. & G. 

 t. 237. 



Hab. Mauritius and Bourbon ; and a similar plant, but with shorter and browner 

 scales, gathered by Mann at Fernando Po. This has quite the habit of the next, but 

 the scales are different. 



] 9. A. latifolium, Sw. ; rhizome thick, woody, often creeping, the scales lan- 

 ceolate, crisped, dark or light-brown ; st. 6-12 in. 1., firm, erect, stramineous, 

 naked or slightly scaly ; barren fr. 9-18 in. 1., 2-4 in.br., the point acute, the 

 lower part narrowed gradually, the edge entire, thickened and cartilaginous; 

 texture very coriaceous ; both sides naked or nearly so ; fertile fr. considerably 

 narrower than the barren one. Hk. Sp. 5. p. 202. 



Hab. Mexico and Cuba to Brazil and Peru. From this we cannot distinguish clearly 

 A. longifolium, Jacq., A. Sartorii, Liebm., A. Blanchetii and Tovarense, Mett., A. seal- 

 pellum, Mart., A. alismcefolium, Schomburgkii, Funckii, and andicola, Fe'e, and the 

 Javan A. callcefolium of Blume. A plant from the Seychelles is probably the same. 



** Both surfaces nearly or quite naked, the edge of the frond fringed. 

 Sp. 20-24. 



20. A. stramineum, Mett. ; rhizome short, stout, the scales lanceolate-subulate, 

 often \ in. 1., bright-brown ; st. 5-9 in. 1., stramineous, finally naked ; barren fr. 

 3-5 in. 1., f-lj in. br., narrowed gradually to both ends ; texture subcoriaceous ; 

 the margin ciliated but the scales deciduous ; fertile fr. l|-2 in. 1., ^-| in. br., 

 the st. 2-4| in. 1. Mett. Fil. Nov. Gran. p. 200. 



Hab. N. Granada, Lindig, 251. Very near the next species. 



21. A. melanopus, Kze. ; rhizome short-creeping, densely clothed with small 

 reddish-brown linear scales ; st. 2-3 in. 1., densely clothed with linear spreading 

 dark chesnut-brown scales ; barren fr. 5-8 in. 1., 2 in. br., the apex acuminate, 

 the base rounded or subcuneate ; texture coriaceous ; veins lax, the margin 

 ciliated with similar scales ; fertile fr. 3-4 in. 1., in. br., on a longer stem. 

 Mett. Fil. H. Lips. p. 19. t. 1. 



Hab. Venezuela. This comes near the small forms of the next, and there are a few 

 scales on the lower part of the midrib beneath. 



22. A. hybridum, JBory ; rhizome woody, the scales dense, J-| in. 1., linear, 

 crisped, dark chesnut-brown ; st. subtufted, 6-9 in. 1., firm, erect, with scattered 

 squarrose linear dark scales ; barren fr. 6-12 in. 1., 1^-2 in. br., the point 

 acuminate, the base rather rounded ; texture subcoriaceous ; both sides naked 

 except the midrib beneath, the edge ciliated with linear-subulate scales ; veins 

 immersed, usually once forked ; fertile fr. much smaller than the others. 

 j8, A. Vulcani^ Leperv. ; fr. ovate-oblong, cuspidate, 3-4 in. 1., l\ in. br. Hk. 

 Sp. 5. p. 231. 



Hab. Mascaren Isles, Natal, Tristan d'Acunha, Cameroon Mountains, Fernando Po, 

 Mexico to Brazil. The scales here are from 1 to 1| line long, and often fall quite away 

 as the frond matures. A. Lindbergii, Mett., from Brazil, appears to be identical with 

 this. 



23. A. decurrens, Desv. ; rhizome woody, the scales large, ovate, dull-brown ; 



