102 CHARACTERS OF TRIBES AND GENERA. 



deny some states of 8. heterocarpa and S. Feei a place in 

 Pleuridium. 



This genus consists of about 8 to 10 known species, all 

 natives of Tropical India, Malayan Peninsular and islands. 



The genus Loxogramma contains species analogous in 

 habit, venation, and linear sori, but differs in having 

 adherent vernation. 



* Fronds simple. 



Ex. S. caudiforme (Bl.) (v v.) ; S. Feei, Borg. ; S. ma- 

 crophylla, Bl. ; S. Wrightii (Hook.) ; S. heterocarpa, Bl. ; 

 S. Hamiltoniana, Wall. 



** Fronds pinnatifidly pinnate. 

 S. pothifolia (Don.) (v v.) 



Sect. 4. PHYMATODEJ;. 



18. PHYMATODES, Presl (1836). 

 Polypodium sp. auct., Hook. Sp. Fil. 



Surculum generally thick, short, or much elongated, 

 becoming smooth. Fronds simple, pinnatifid, or pinnate, 

 smooth, coriaceous, or thin, flaccid, segments adherent with 

 the rachis. Primary veins undefined or evanescent, rarely 

 defined. Venules compound anastomosing, with free vein- 

 lets terminating in the areoles, internal, obscure, or 

 evident. Receptacles compital, in some deeply immersed. 

 Sori round or oblong, sub-medial, transversely uniserial, or 

 irregular by confluence, naked. 



Type. Poli/podium Phymatodes, Linn. 

 Illust. Hook. Fil. Exot. t. 22, 25 ; Hook. Gard. Ferns, 

 t. 47 ; Moore Ind. Fil. p. 62, fig. 7 ; J. Sm. Ferns, 

 Brit, and For., fig. 21 ; Hook. Syn. Fil., t. 5, fig. 

 48m. 



