KEYS TO THE FERNS OF BORNEO 359 
21. D. CRASSIFOLIA (Bl.) O.K. 
Sarawak, Dutch Borneo. 
Malaya to Burma. 
22. D. Teuscheri v. A. v. R. 
Dutch Borneo. 
Local. 
23. D. CALCARATA (Bl.) O.K. 
Sarawak, Dutch Borneo. 
Malaya to India and China, Samoa. 
24. D. gracilescens (BL) O.K. 
Dutch Borneo. 
Malaya to India. 
25. D. viscosa (J. Sm.) O.K. 
Kinabalu; also “ Borneo,” {coll. Lobb). 
Malacca, Mindanao, Negros. 
26. D. ATHYRIOCARPA Copel. 
Sarawak. 
Endemic. 
27. D. echinata (Mett.) O.K. 
Sarawak, Dutch Borneo. 
Sumatra, Celebes, New Guinea. 
28. D. Hallieri (Christ) C. Chr. 
Dutch Borneo. 
Endemic. 
29. D. trichopoda C. Chr. 
Nephrodium polytrichum Baker. 
Sarawak. 
Endemic. 
Van Alderwerelt describes also a var. Hallieri, from 
Dutch Borneo, with smaller fronds and narrower pinnae. 
30. D. paucisora Copel. 
Sarawak (Mt. Penrissen). 
Endemic. 
