122 21. ADIANTUM, § EUADIANTUM. 



naked, dark chesnut-brown ; fr. 4-G in. 1., | in. "br., witii a terminal lobe" and 

 numerous subopposite pairs of pinnce, the lower ones distant, distinctly stalked, 

 g in. 1., 2^-f in. br., hastate-deltoid, cordate or cuneate at the base ; texture 

 pellucido-herbaceous ; venation flabellate ; sori in interrupted lines along the 

 sides of the pinnae, not reaching the rounded apex. — Hk. 8p. 2. p. 9. 



Hab. West Indian Islands. — Stem casually once branched below. A very clearly- 

 marked species. The pinnas resemble an ivy-leaf in miniature, but there is no clearly- 

 defined central midrib. 



+t Segments dimidiate, toith the line of fruit absent altogether from the lower 

 margin. Sp. 37-40. 



37. A. villosum, Linn. ; st. 9-12 in. 1., strong, erect, blackish, polished, 

 .tomentose ; fr, with a terminal central and several erecto-patent pinnce on each 

 side, 6-12 in. 1., lJ-2 in. br. ; pinnl. dimidiate, about 1 in. 1., f in. br., the lower 

 line nearly straight, the upper nearly parallel with it, but considerably larger," 

 slightly toothed and the outer edge auricled at the base ; texture coriaceous ; 

 rachises tomentose, both surfaces naked ; sori in a continuous line round the 

 upper and outer edge. — Hk. Sp, 2. p. 18, A. falcatum, Sw. S. F. p. 19, 



Hab. West Indies and Panama southward to Brazil. — Easily recognizable by having 

 the line of fructification continued all along the upper -and then usually down the oblique 

 outer edge. A. obUgm-trimcatum, Ffo, seems to be the ordinary form of this species. 



38. A. puherulentum, Jj. ; s*." 6-12 in. 1., strong, erect, blackish, tomentose; 

 fr. with a terminal pinna and several spreading lateral ones en each side, wliich 

 are 4-B in. I., 1 in. br. ; pinnl. ^ in. 1., 1^-2 lin. deep, dimidiate, the lower line 

 nearly straight, the upper one nearly parallel, both it and the outer edge finely 

 toothed ; texture subcoriaceous ; rachises tomentose, surfaces naked ; sori in 

 a continuous line along the lower two-thirds of the upper edge. — Hk. Sp. 2. 

 i». 17. 



Hab. West Indies southward to Brazil. — Here the line of fruit does not usually extend 

 beyond the inner half or two-thirds of the upper margin. 



39. A. incisum, Presl ; st. 4-6 in. 1., wiry, polished, naked, nearly black ; fr. 

 6-12 in. 1., 3-4 in. br., simply pinnate or vsritii, one or two pairs of short spreading 

 branches at the base ; pinnce 1-2 in. 1., J-^ in. deep, subdimidiate, the lower line 

 often considerably curved upwards and toothed in its outer half, the upper one 

 also more or less falcate and not deeply lobed ; texture subcoriaceous ; rachis 

 nearly naked ; sori in a continuous marginal line on the edge of the lower two- 

 thirds of the upper margin. — Hk. Sp. 2. p. 16. A. alarconianum, Gaud. 



Hab. West of Mexico and Columbia, Galapagos Island. — Very near A. puhemlentum, 

 with which it quite agrees in the fruit. The frond is less branched, and the pinnules 

 are larger and more toothed. 



r- 



40. A. microphylhm, Kaulf. ist. 6-9 in. 1., strong, erect, tomentose ; fr. with a 

 terminal pinna 6-9 in. 1., and several erecto-patent lateral ones on each side, the 

 lowest of which are branched again ; segm. -^-f in. 1., J in. br., unequal-sided, 

 with a midrib, the lower at first at a right angle with the stem and afterwards 

 decidedly upcurved, the upper nearly entire, upcurved, so that the segment is 

 falcate and narrowed to an acute point ; texture coriaceous ; rachis tomentose or 

 nearly naked ; sori in a few elongated patches along the upper edge. — Hk. Sp. 2. 

 p. 47. 



Hab. West Indies, rare. — Very doubtfully distinct from A. puherulentum. In habit 

 and general appearance they are identical, but this has the line of fructification slightly 

 interrupted. Grisebach suggests that this is probably A. pyramidale, Willd. 



