64 Ferns of British India and Ceylon. 



Blume have been lumped with glandulosum, which caused Mr. 

 Clarke to place pennigerum also in that species. 



Nephrodium. 

 . i. Involucres prominent. 



A. Rhizome wide-creeping. 



a. Lower pinnae not reduced, or slightly so in molliusculum, 

 and sometimes in namburense. 



*Only I pair of veins anastomose, or rarely 2 in unitum. 



1. subpectinatum. Venation and sori anomalous. 



2. unitum. A swamp fern, no auricles on the pinnae. 

 5. pteroides. Sori confined to the lobes. 



4. extensum. Venation often lastreoid, when anas- 



tomosing the angle acute at apex. 



5. procurrens. Anastomosis at a very obtuse angle, 



shortly hairy, or nearly glabrous. 



6. molliusculum. Venation of procurrens, surfaces 



with long needle-like hairs. 



7. biauritum. A swamp fern, some lower pinnae 



auricled at superior base. 

 **2~4 pair of veins anastomosing. 



8. namburense. 



b. Lower pinnae considerably reduced. 



9. cucuLLATUM. Very coriaceous and hairy, 3-5 



pair of veins anastomose. 



10. aridum. Very coriaceous and hairy, 5-6 pair of 



veins anastomose. 



11. papyraceum. Papyraceous nearly glabrous, 6-7 



pair of veins anastomose. 



B. Rhizome erect, sub-erect, or occasionally somewhat creep- 



ing in molle, amboinense and pennigerum. 

 a. Sori punctiform even in age. 



