288 



FERNS I BRITISH AND FOREIGN. 



subauriculate on the upper margin. Sorl uniserial, 

 antiraarginal. Indusium suborbicular. Borneo. 



OBS. The affinity of this species is with 1ST. tuberosa ; but 

 seeing the two plants together, the difference is readily seen. 



79a. ISOLOMA, /. 8m. 



Vernation fasciculate, erect, stoloniferous. Fronds linear, 

 1-2 feet long, pinnate ; pinnae oblong, elliptical or lanceolate, 

 falcate, coriaceous, the base truncate and subauriculated ; 

 petiole short, articulated with the rachis. Veins forked ; sterile 



Genus /Qa. Portion of sterile frond and a fertile pinna, natural size 

 ditto enlarged. No. 1. 



venules free, the fertile transversely combined at the margin, 

 forming a continuous receptacle. Indusium linear, interiorly 

 attached, plane, equal with and conniving with the margin, 

 forming with it a vertical exteriorly open groove, containing 

 the sporangia. 



1. I. lanuginosa, J. Sm. in Lond. Journ. Sot. 1, p. 420. 

 Lindseea lanuginosa, Wall. ; Hook. Sp. Fil. 1, t. 69 B. 

 Singapore, Penang, New Guinea, and Seychelles 

 Islands. 



