Asia-Tropical: Maluku (Maluku present); Sulawesi (Sulawesi present), S Philippines present
Malesia: S Philippines, Sulawesi, Moluccas.
1 A characteristic difference between this species and the closely related S. feei is the disposition of the sori, which in S. caudiformis are usually separate, with a distinct and well-developed costal row often clearly distinct from the other sori which are more near the margin. Selliguea caudiformis differs from S. feei moreover in the more distinctly acuminate lamina, and from S. plantaginea and related species mainly in the usually somewhat wider rhizome scales and the presence of hydathodes. However, the distinctions are not completely sharp. 2. Specimens from Sulawesi and the Moluccas may differ, with more strongly contracted fronds, and fewer sori between costa and margin.