60. ACROSTICHUM. 409 



linear scales, dark chesnut in the centre, grey at the edge ; barren fr. 3-4 in. 1., 

 1-1^ in. br., blunt at both ends ; texture coriaceous ; both sides densely clothed 

 with pale-brown linear scales ; veins hidden ; fertile fr. smaller than the other 

 and on a much longer stem. Hk. Sp. 5. p. 241. Hk. & Gr. t. 2. 



Hab. Tristan d'Acunha, and reported also from Bourbon and Mauritius. Habit of 

 A. conforme. 



B. Fronds 6-18 inches long. Sp. 52-65. 



52. A. cinnamomeum, Baker ; rhizome short-creeping, the scales dense, linear, 

 bright reddish-brown ; st. 3-4 in. 1., firm, densely clothed with similar but 

 narrower squarrose scales ; barren fr. 4-6 in. 1., ~| in. br., narrowed gradually 

 to both ends ; texture coriaceous ; both sides, especially the lower one, densely 

 clothed with long bright-yellow hair-like scales, which are scarcely at all 

 flattened or ciliated ; veins hidden ; fertile fr. shorter and blunter than the other, 

 the stem longer. 



Hab. Cameroon Mountains and Clarence Peak, Fernando Po, G. Mann. This agrees 

 with the next in size and habit, but the scales are quite different. 



53. A. lepidotum, Willd. ; rhizome thick, woody, the scales very dense, linear, 

 glossy, black ; st. 1-3 in. 1., firm, scaly throughout ; barren fr. 3-6 in. 1., 

 -f in. br., the point usually blunt, the base cuneate or rather rounded ; texture 

 coriaceous ; scales furfuraceous and white on the upper surface, large, dense, 

 ovate, ciliated, and ferruginous on the lower one, those on the midrib with a 

 black middle ; veins hidden; fertile fr. similar to the other, but the stem longer. 

 -HLSp.5.p.2Q8. 



Hab. Andes, from Columbia to Peru. To this appear to belong A. Engelii, Karsten, 

 A. Dombeyanum, Fde, the West Indian A. vestitum, Schlecht., and Mexican A. fulvum, 

 M. & Gr., and probably A. rufescens, Liebm. It may be a dwarf mountain variety of 



54. A. strictum, Raddi ; rhizome woody, short-creepirig, densely clothed with 

 small lanceolate dark chesnut-brown conspicuously ciliated scales ; st. 1-2 in. 1., 

 clothed with similar scales ; barren fr. 4-6 in. L/J-J in. br., narrowed to both 

 ends ; texture subcoriaceous ; veins mostly simple ; upper surface nearly or quite 

 naked when old, lower densely clothed with bright reddish-brown scales, which 

 are almost reduced to stellate tufts of hairs ; fertile fr. about equal to the other, 

 but the stem longer. Hk. Sp. 5. p. 225. 



Hab. Brazil and Columbia. This bears the same relation to auricomum that lepidotum 

 does to muscosum. 



55. A. villosum, Sw. ; rhizome woody, but not thick, densely clothed with 

 bright-brown soft fibrillose scales ; st. tufted, 2-4 in. 1., slender, densely clothed 

 with spreading scales like those of the base ; barren fr. 6-9 in. 1., 1-1^ in. br., the 

 point acute, the lower part narrowed gradually ; texture thin and flaccid ; both 

 sides with scattered scales like those of the stem, and the edge usually densely 

 ciliated ; veins distant, usually once forked, clubbed at the point and not 

 reaching the edge ; fertile fr. much smaller than the other. Hk. Sp. 5. p. 225. 

 Hk. $ Gr. t. 95. 



Hab. Mexico and Cuba to Peru. A plant gathered by Barter at Sierra Leone is like 

 this, but more robust and more scaly. A . undulatum, Willd., Hk. Sp. 5. p. 212, is evidently 

 a form. It is larger and thinner than the type, with main veins two lines apart. A. seto- 

 sum, Liebm., is a small form, less scaly than usual, and A. Plumieri, Fe'e, Hk. Sp. 5. p. 226, 

 a thin variety, with the edge of the frond repand. This may be known from all its 

 neighbours, except cinnamomeum, by the scales, however dense, being uniform, and not 

 at all flattened. 



3 F 



