Nepenthes fusca subsp. kostermansiana J.H.Adam & Wilcock ex Jebb & Cheek in Blumea 42(1). 1997
Nepenthes fusca subsp. kostermansiana in Blumea 42(1). 1997
Isotype: Borneo, E Kalimantan, Berau, Mt Njapa, Kelai River, alt. 1000 m, 25 Oct 1963, Kostermans 21495 (K)
Holotype: Borneo, E Kalimantan, Berau, Mt Njapa, Kelai River, alt. 1000 m, 25 Oct 1963, Kostermans 21495 (L)