122 21. ADIANTUil, § EUADIANTUJr. 



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

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

 \ in. ]., \-\ in. br., hastate-deltoid, cordate or cuneate at the base ; texture 

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

 sides of the pinna;, not reaching the rounded apex. — Hh. Sp, 2. p. 9. 



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

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

 defined central midrib. 



ft Segments dimidiate^ with 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 pinnae on each 

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

 line nearly straight, the upper nearly parallel with it, but considerably l^wger, 

 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. ohliq_u&-truncaturit, F^e, seems to be the ordinary form of this species. 



38. A. pulverulentum, L. ; st. 6-12 in. ]., strong, erect, blackish, tomentose ; 

 fr. with a terminal pinna and several spreading lateral ones on each side, which 

 are 4-8 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. 

 p.^1. 



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 with one or two pairs of short spreading 

 branches at the base ; pinnce 1-2 in. 1., J-i 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 ; soi'i 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. pulverulentum, 

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

 are larger and more toothed. 



40. A. microphyllum, Kaulf. ; st. 6-9 in, L, 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. ^-^ in. 1., ^ 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.Al. 



Hab. West Indies, rare. — Very doubtfully distinct from A . pulverulentum. 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. 



