21. ADIANTUM, EUADIANTUM. 121 



Hab. Tropical America, from Mexico and the West Indies southward to Brazil ; 

 gathered also iu West Tropical Africa by Barter, Vogel, and Mann. I am not prepared 

 to point out any good character by which A. Cayennense, Willd., and A . Brasiliense, 

 Raddi, may be distinguished from this widely-diffused and variable species. 



***# Oligosorous group. Frond once or more pinnate, the fruit in continuous 

 or slightly interrupted marginal lines. Sp. 32-40. 



t Segments with a line of fruit on both sides, therefore not dimidiate. Sp. 32-36. 



32. A. lucidum, Swartz ; st. 6-9 in. 1., strong, erect, scabrous, tomentose ; fr. 

 9-15 in. L, 4-8 in. br., simply pinnate, with a large terminal pinna and 6 to 10 

 lateral ones on each side, or the lowest very slightly branched, 3-4 in. L, ^-1 in. 

 br., nearly equal-sided, but obliquely truncate at the base below, lanceolate- 

 acuminate, slightly serrated towards the point ; texture coriaceous ; rachis 

 densely tomentose ; veins free or anastomosing casually towards the edge, midrib 

 distinct ; sori in a continuous row along each side. Hk. Sp. 2. p. 4. t. 79. C. 



Hab. West Indian Islands and Panama southward to Brazil. This comes so near the 

 polysorous A . obliquum in everything but the fruit, that Dr. Grisebach unites them. 

 A. platyphyllum, Swartz, is a little-known plant allied to this species. 



33. A*. Phyttitidis, J. Smith ; st. strong, erect, naked, nearly black, polished, 

 6-12 in. 1. ; fr. 6-12 in. L, 3-6 in. br., simply pinnate, with a large terminal 

 lobe, and 1 to 6 pinnae on each side, or the lower pair again branched below ; 

 pinnce 3-4 in. L, f-1^ in. br., ovate or lanceolate-acuminate, very nearly entire, 

 narrowed or rather rounded and stalked at the base ; texture coriaceous ; sori in 

 a continuous line along both margins. Hk. Sp. 2. p. 5. t. 72. B. 



Hab. Guiana and Eastern Peru ; gathered by Schomburgk, Spruce, and Appun. This 

 comes very near A. lucidum, but the pinnae are fewer in number and broader, and the tex- 

 ture is thicker, and the venation consequently less distinct. They are the only polyso- 

 rous species with a distinct midrib, and the shape of the pinnae also characterizes them 

 clearly. 



34. A. macrophyllum, Swartz ; st. 6-12 in. L, strong, erect, polished, naked, 

 nearly black ; fr. 9-15 in. L, 4-8 in. br., simply pinnate (4 to 6 pairs of pinnae') ; 

 lower ones of the barren frond 3-4 in. 1., 2 in. br., ovate, so broad at the base that 

 the opposite ones frequently overlap, the margin rather deeply lobed, fertile ones 

 narrower ; texture membranaceo-herbaceous ; sori in long continuous or slightly 

 interrupted marginal lines. Hk. Sp. 2. p. 3. Hk. fy Gr. Ic. t. 132. Hk. F. 

 Ex. t. 55. 



Hab. Mexico and West Indian Islands southward to Brazil and Ecuador. Occasionally 

 this fine and well-known species becomes bipinnate in the lower part. The young fronds 

 are often beautifully tinged with red. Its large equal-sided sessile pinnae mark it 

 clearly. 



35. A. Seemanni, Hk. ; st. 6-9 in. 1., erect, blackish, polished ; fr. 6-12 in. L, 

 simply pinnate or the lower branches compound ; pinnl. 3-4 in. 1., 1^-2 in. br., 

 ovate-acuminate, but rather unequal-sided, the barren ones finely serrated, one 

 side usually cordate at the base, the other obliquely truncate, petioles of the 

 lowest nearly an inch long ; texture subcoriaceous ; veins prominent and the 

 under surface glaucous ; rachis naked, polished ; sori in long continuous marginal 

 lines. #. Sp. 2. p. 5. t. 81. A. 



Hab. Veraguas and Guatemala ; gathered by Dr. Seemann and Messrs. Salvin and 

 Godman. This also is a very fine plant. It comes very near the polysorous A. Peruvi- 

 anum in habit, but is less branched. The pinnse are larger even than those of A. macro- 

 pfiyllum, and have black polished stalks often an inch long. 



36. A. deltoideum, Swartz ; &. densely tufted, 3-4 in. J., wiry, erect, polished, 



Q 



