Ferns of British India and Ceylon. 109 



South India {Wight) ; Calcutta, Lucksagur tank {Watt) ; 

 Ceylon, Unia-oya, Cent. Pro v. {Trimen). 



1. Ophioglossum vulgatum. I believe all the Himalayan 

 specimens are referable to reticulatum ; I can see no difference 

 in the venation. 



2. Ophioglossum nudicaule. Some of the smaller speci- 

 mens of this have quite the grass-like fronds of gramineum, and 

 these do not differ from that fern in venation, when the fronds 

 are broader like the specimens figured in F, S. I. tab. 71 the 

 venation is more complicated, and there are a few free veinlets, 

 I suspect it is only a form of gramineum ; this would reduce 

 our Indian species to four. 



3. Ophioglossum fibrosum. This is found in Ceylon. 

 {Thwaites, C.F. 3,993.) Dr. Trimen also sends a smaller variety, 

 collected at Puttalam, which has the fronds obovate to oblong, 

 but with exactly the same venation. 



Occasionally there is a single thickened central vein forming 

 a midrib nearly to the apex of the frond, but more frequently 

 there are 2-3 strong central veins running parallel and close to 

 each other, which fork more or less upwards and disappear well 

 short of the apex of the lamina, there are numerous free and 

 often forked veinlets in the areoles. Ophioglossum costatum 

 {R. Br.) is apparently the same fern, 



4 Ophioglossum reticulatum. Parasnath, 2,500 feet alt. 



5. Ophioglossum pendulum. O. intermedium {Hook. Syn. 

 Fit. is a synonym. Makum Forest, Lukhimpore; Assam {Mann). 

 (Also in Borneo.) 



Helminthostachys ZEYLANlCA. 



(Also in Solomon Islands and New Guinea.) 



