1 OOPELAND. 



4. MAR ATT I A Swartz. 



Fronde large, at least bipinnate; pinnae attached by pulvini; sori below 

 the apices of the free veins, in a row parallel to each margin, the sporangia 

 of each sorns fused together forming a synangiuin. Christensen recog- 

 nizes 28 species, in the tropics of both hemispheres and south to the (Jape 

 of Good Hope. Our species are too near together. 



Synangia usually of 8 or less pairs of sporangia. 

 Main rachis sraootli. 



Pinnules broadly lanceolate, acuminate 1. M. fra-tim <i 



Pinnules narrowly lanceolate, caudate 2. M.pellucida 



Main rachis rough 3. M. sambuciwt 



Synangia usually of 10 or more pairs of sporangia. 



Coarsely serrate 4. M. silvatiea 



Obscurely serrate, except at apex 5. .1/. ternatea 



1. Marattia fraxinea Smith. 



The original plant, from Bourbon, has bipinnate fronds, naked axes, 

 almost sessile pinnules 5 to 8 cm long, serrate, lanceolate, acuminate: 

 sori submarginal, sporangia about 6 on each side. 



Various modern writers have included under this name all the related forms, 

 of Malaya, Asia, Africa, and tropical Australia. I mention here those regarded 

 as distinct by Diels, Christ or Christensen. 



2. Marattia pellucida Pies]. 



Similar to M. fraxinea, but the pinnules narrower and longer (10 em 

 long), decidedly caudate, pale beneath, the sori shorter (usually about 

 1 mm long). The two species should probably be united; M. vestita 

 Christ is probably identical with .1/. pellucida. 



Philippines; New Caledonia. 



3. Marattia sambucina Bl. 



Main rachis rough, rachises of pinnae winged; pinnules sessile, hardly 

 (i cm long, oblong-lanceolate, sharply serrate with appressed teeth; vein- 

 lets simple; sori two-fifths of the way from the margin to the cost a : 

 sporangia 8, more or less, on a side. 



• lava. Celebes; Luzon, teste Christ. 



4. Marattia silvatiea Blume. 



Described as differing from M. sambucina in being coarsely serrate 

 and tripinnate. The Luzon plant referred here is very coarsely serrate, 

 sometimes tripinnate but not normally so, has pinnules up to 9 cm long, 

 usually stalked, and large synangia of 12 or more pairs of synangia. 



Java. New Guinea; Luzon. 



