21. ADIAXTUM, § EUADIAXTUSr. 121 



Ifab. Tropical America, from Mexico and the West Indies southward to Tjrazil ; 

 gathered also in West Tropical Africa byj Barter, Vogel, and Mann. — A. frucluosum, 

 fc>])reng. Ilk. Sp. 2. 24. A. llcndersoni, Linden, 111. Hort. tome 20. t. 127, ia a variety 

 with small blunt pinnules. 



**** Oligosorous group. — Frond 07ice or more phinate, the fruit in continuous 

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



t Segments with a line of fruit on both sides, therefore not dimidiate. Sp. 82-3G. 



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

 9-15 in. 1., 4-8 in. br., simply pinnate, with a larire 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. — Ilk. Sp. 2. p. 4. t. 79. C. 



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

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



33. A. Phyllitidis, J. 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 

 lol)e, and 1 to 6 ^««««? on each side, or the lower pair again branched below ; 

 jnnncc 3-4 in. 1., |-H in. br., ovate or lanceolate-acuminate, very nearly entire, 

 narrowed or rather ixjunded 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 Schoniburgk, 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. macropliyllum, Swartz ; st. 6-12 in. 1., strong, erect, polished, naked, 

 nearly black ; //•. 9-15 in. 1., 4-8 in. br., simply pinnate (4 to 6 pairs oi pinnce) ; 

 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. Ilk. 4" Gf. 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. Seetnanni, 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, 13-2 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. Scemann, ifessrs. Salvin and Goclman ; Brazil, 

 Martius.—1h\n also is a very tine plant. It comes very near the polysorus A. 2yeruvi- 

 anum in habit, but is less branched. The pinna3 are larger even than those of A. macro- 

 j)hyllum, and have black polished stalks often an inch long, 



36. A. deltoideum, Swartz ; st. densely tufted, 3-4 in. 1., wiry, erect, polished, 



