21. ADIANTUJI, EUADIANTUM. 121 



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

 gathered also in West Tropical Africa by| Barter, Vogel, and Mann. A. fructuosum, 

 Spreng. Hk. Sp. 2. 24. A. Hendersoni, Linden, 111. Hort. tome 20. t. 127, is a variety 

 with small blunt pinnules. 



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

 or slightly interrupted marginal lines. Sp. 32-40. Synechia, Fee. 



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. 1., -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. 



33. A. Phyllitidis, 3. Smith ; st. strong, erect, naked, nearly black, polished, 

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

 lobe, and 1 to 6 pinnce 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 .4. 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. 1., 4-8 in. br., simply pinnate (4 to 6 pairs of pinna?} ; 

 lower ones of the barren frond 3-4 in. L, 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. $ Gr. Ic. t. 132. Hk. P. 

 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. 1., 

 simply pinnate or the lower branches compound ; pinnl. 3-4 in. L, 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. Hk. Sp. 2. p. 5. t. 81. A. A. populifolium, Mart. 



Hab. Veraguas and Guatemala, Dr. Seemann, Messrs. Salvin and Godman ; Brazil, 

 Martins. This also is a very fane plant. It comes very near the polysorus A. peruvi- 

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

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



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







