406 60. ACROSTICHUM. 



85. A. lineare. Fee ; rhkome short- creepino:, the scales dense, linear, glossy- 

 brown ; St. of barren frond 1-3 in. 1., slender, thinly clothed with squarrose 

 linear scales ; barreii fr. 8-12 in. 1., J-§ in. br., narrowed very gradually to both 

 ends ; texture thin, midrib beneath with a few linear scales and under surface 

 slightly furfuraceous ; veins distant, not reaching the edge ; fertile fr. not more 

 than 2-3 in. 1., on a slender stem 4-8 in. \.—Iik. iSp. 5. p. 221. 



Hab. Brazil, Gardner, 98, 5927 ; and a plant from Bourbon differs only by its more 

 distinct raised veins. — This is very likely a narrow-fronded variety of the next, with 

 which it agrees in clothing and texture. 



36. A. Aubertii, Desv. ; rJiizome woody, short-creeping, the scales dense, 

 linear, bright-brown ; st. of barren frond 1-G in. 1., clothed with squarrose linear 

 brown scales ; barren fi\ 1 ft. or more 1., ^-1 in. br,, the point acute, the lower 

 part narrowed gradually, the edge entire or subrepand ; texture thin ; midrib and 

 edge slightly ciliated with scales like those of the stem ; veins fine, conspicuous, 

 usually simple, 1 lin. apart ; fertile fr. 2-3 in. L, ^-| in. br., narrowed suddenly 

 at the base, the stem 6-i) in. \.—Hk. Sp. 5. p. 219. 



Hab. Bourbon, Natal, Zambesi-land, Fernando Po, Venezuela (^. Klotzschii, Moritz), 

 Guatemala. — A well-marked species, differing from viscosum in texture, clothing, and 

 veining. 



37. A. dimorphum, Hk. & Gr. ; rhizome stout, horizontal, the scales lanceolate, 

 dark-brown ; st. close, 4-6 in. 1., slender, erect, slightly scaly throughout ; 

 barren fr. 3-5 in. 1,, -j-fin. br., the point bluntish, the edge deeply and irregularly 

 crenate ; texture subcoriaceous ; both sides covered with minute white dots ; veins 

 subparallel, simple or forked ; fertile fr. much smaller than the barren one, 

 nearly entire.— ZT/i;. Sp. 5. p. 208. Hk. ^ Gr. t. 145. 2nd Cent. t. 90. 



Hab. St. Helena. — The on\j Elaplwglossum that has the fronds distinctly incised or 

 crenated. 



38. A. viscosum, Sw. ; rhizome woody, short-creeping, the scales dense, fibril- 

 lose, dark chesnut-brown ; st. 3-6 in. 1., firm, erect, furfuraceous, often viscous ; 

 barren fr. 6-12 in. 1., \-\ in. br., the apex acute, the lower part narrowed 

 gradually ; texture subcoriaceous ; both sides more or less viscid and minutely 

 furfuraceous ; veins close and fine ; fertile fr. smaller, and on longer stems than 

 the others.— ///t-. >S>. 5. p. 220. Hk. Sf Gr. t. 64. 



Hab. Cuba to Brazil and Peru ; Himalayas to Ceylon, Java, and Philippines ; Sey- 

 chelles, Mascaren Isles, Fernando Po, Angola.— From the large forms of this we cannot 

 distinguish clearly A. xanihoneuron, Karstenianum, dissimilc, and curvans, Kze. The 

 two latter are described as squamulose, but both our authentic specimens are nearly 

 naked. The frond often becomes quite naked in an old state, and then the plant is 

 difficult to recognize. 



89. A. ciliatum, Presl ; rhizome woody, wide-scandent, the scales short, dense, 

 deciduous, linear, dark chesnut-brown ; st. of barren frond 6-9 in. 1., firm, erect, 

 slightly scaly ; barren fr. 12-18 in. 1., |-lj in. br., the point acute, the base 

 narrowed gradually ; texture subcoriaceous ; both sides nearly naked ; the edge 

 deciduously furfuraceous ; veins fine, close, indistinct ; fertile fr. smaller and on 

 much longer stems than the others. — A. Preslianum, Fee. Hk. Sp. 5. p. 220. 

 {not p. 265). 



Hab. Columbia to Peru. — Probably a variety of the last, from which it differs chiefly 

 by its woody wide-scandent rhizome and larger barren fronds. 



40. A. pilosum, II. B. K. ; rhizome woody, the scales large, dense, lanceolate, 

 pale-brown ; st. 6-8 in. 1,, firm, flexuose, slightly scaly ; barren fr. flexuose, 

 6-8 in. 1., I in. br., the point acute, the base narrowed gradually ; texture 

 lierbaceous ; both sides, especially the under one, clothed with small bright- 



