KEYS TO THE FERNS OF BORNEO 
317 
33. T. SETACEUM V. d. B. 
Dutch Borneo, Sarawak. 
Singapore, Banca. 
Not sharply distinguished from T. cupressoides . 
34. T. apiifolium Presl. 
Sarawak, North Borneo. 
Malaya to New Guinea. 
The report of T. bauerianum Endl. from Dutch 
Borneo probably rests on the opinion that such is the 
proper name of T. apiifolium. 
35. T. Merrillii Copel. 
Sarawak, Dutch Borneo, Sandakan. 
Palawan. 
Van Alderwerelt distinguishes the form from Dutch 
Borneo as “ var. borneense .” This species approaches the 
subgenus Leptomanes. 
Subgenus VI. CEPHALOMANES. 
a. Sori terminal on the pinnae 36. T. smnatranum. 
a 1. Sori chiefly on the upper edge of pinna. 
b. Sori in groups 37. T. Rosenstockii. 
in Sori normally single on the lobes or teeth 38. T. javanicum. 
36. T. SUMATRANUM V. A. V. R. 
Boundary between Dutch and North Borneo 
(Amdyah), Sarawak. 
Sumatra. 
37. T. Rosenstockii v. A. v. R. 
Dutch Borneo; Sarawak (?). 
Endemic. 
38. T. javanicum Blume. 
Common. 
Madagascar to India, Polynesia and Australia. 
This is a variable fern, from which nearly related 
species, if there be such valid, are naturally difficult to 
distinguish. 
Van Alderwerelt has described T. borneense from 
Dutch Borneo, but the diagnostic characters are not 
clear to me from his description. 
