116 21. ADIANTUM, § EUADIANTUM. 



9. A. Galcottiamim, Hk. ; 5^ 8-4 in. 1., naked, erect, dark chesnut-brown, 

 wiry, polished ; fr, 6-9 in. 1., simply pinnate, or branched at the base ; 

 pinnce in numerous opposite pairs, f in. eacli way, suborbicular, nearly entire, 

 slightly stalked ; texture coriaceous ; veins very close and tine but prominent ; 

 sori obvei'selv ren if orm,. about 1 lin. across, placed in shallow sinuses all round 

 the frond.— Z^^. Sp. 2. p. 10. t. 80. B. 



Hab. Mexico, province of Oaxcaca, at an elevation of 3,000 ft., Galeotli, 6561. — A very 

 distinct species, easily recognized by its large round equal-sided pinnules. The venation 

 is very clearly marked on the under side of the frond, but is quite flabellate, and there is 

 no central rib which is stronger than the others. 



10. A. peruvianum, Klotzsch ; st. 6-9 in. 1., strong, erect, nearly black, 

 polished, naked ; fr, simply pinnate, or with 1-3 branches at the base, or even 

 with some of the latter again slightly branched ; pinnules 2 in. or more br., 

 1^ in. deep, unequally ovate, cuneate at the base, sometimes with an 

 acuminated point, tinely toothed and lobed round the upper and outer edge, the 

 lowest on stalks ^-| in. 1. ; texture papyraceo-herbaceous ; rachis and both 

 surfaces naked ; sori in interrupted patches round the sides of the pinnules. — 

 Hk.Sp.2.p.25.t.m.G. 



Hab. Peru ; gathered by Mathevps, and lately again by Spruce. — A very fine and 

 ■well-marked species, which the size and shape of its pinnules will readily distinguish in 

 the group. 



11. A. subcordatmn, Swartz ; st. 6-12 in. 1., strong, erect, blackish, naked, 

 polished ; fr. 1-2 ft. 1., 1 ft. br., deltoid, tripinnate ; lower pinnce deltoid, 1 ft. 1., 

 6-9 in. br. ; segm. about 2 in. 1,, 1 in. br., ovate-acuminate, equal at the base, or 

 the lower side obliquely truncate, slightly lobed, on stalks \-\ in. 1. ; texture 

 papyraceo-herbaceous ; rachis and both sides naked ; sori in roundish or trans- 

 versely oblong patches along both sides. — Hk. Sp. 2. p. 34. A. betulinum, 

 Kaulf. 



Hab. Guiana and Brazil. — This resembles in general habit A. trapezlforme, but differs 

 in the shape of the pinnules, which are equilateral or slightly oblique at the base on the 

 lower side. 



12. A. intermedium, Swartz ; st. 6-12 in. 1., erect, strong, polished, but 

 somewhat tomentose ; fr. with a terminal pinna 6-9 in. 1., 2-3 in. br., and 

 1 to 3 small spreading lateral ones on each side ; pinnl. 1-1^ in. 1., \-\ in. br., 

 unequal-sided, but not dimidiate, the lower half being the smallest, about the 

 inner third being cut off, the point bluntish or acute, tlie inner edge nearly 

 parallel with the stem, the upper nearly straight, scarcely toothed ; texture 

 subcoriaceous ; rachis tomentose ; sori in interrupted marginal patches, 1-2 lin. 

 across, placed round the upper edge and outer two-thirds of the lower one. — 

 Hk. Sp. 2. p. 25. A. fovearum, Raddi. A. triangulatum, Kmdf. 



Hab. Tropical America, from Mexico and the West Indies southward to Peru and Hio 

 Janeiro. — A widely-diffused and well-known species, distinguished from A. tetrapliyllum 

 by the outer edge being often brought down so as to be parallel with the upper edge, 

 so that we have two opposite rows of sori instead of one at an acute angle with the 

 other. 



ft Ultimate segments dimidiate, the stems naked and polished. Sp. 13-20. 



1.3. A. Shepherdi, Hk. ; st. 3-4 in. 1., naked, polished, blackish ; fr. 6-12 in. I., 

 simply pinnate ; pinnai -| in. br., |-§ deep, dimidiate, the lower line nearly 

 straight, the upper rounded and, like the two bluntly rounded sides, broadly 

 lobed, quite sessile and usually reflexed, so that the pinnules of the o])posite sides 

 of the rachis are brought face to face, the inner quarter of the blade being 

 imbricated over the stem j texture subcoriaceous ; rachis and both surfaces naked 



