Distribution
Asia-Tropical: Borneo present (Sabah present); Maluku (Maluku present), Batjan present, N. Celebes present, N. Sarawak present
Malesia: Borneo (N. Sarawak; Sabah), N. Celebes, and Moluccas (Batjan).
Notes
This is near S. magnus, but pinnae of S. caulescens (except largest sterile ones) are generally smaller and less deeply lobed, with different pubescence and glandular sporangia.