KEY TO THE SPECIES OF SULAWESI

1Sori irregularly scattered on the lamina surface
1'Sori more or less regularly spaced, either in a single row between costa and margin, or in two, somerimes irregular rows between the lateral veins
2Rhizome white waxy, without sclerified circumvascular sheaths.
2'Rhizome not white waxy, with sclerified circumvascular sheaths
3Connecting veins forming one row of large areoles parallel to the costa, bordered by several smaller areoles; costal areole, if present, formed by smaller veins, sori 1.5-3 mm diam.
3'Connecting veins forming several more or less equally sized areoles between two adjacent veins, sometimes forming one row of small primary costal areoles, sori 1 mm diam.
4Lamina index 20-40, rhizome without scattered sclerenchyma strands, scales peltate, connecting veins 3 or 4 between adjacent veins
4'Lamina index 4-8, rhizome with scattered sclerenchyma strands, scales pseudopeltate, connecting veins 6-10 between adjacent veins
5Rhizome white waxy
5'Rhizome not white waxy
6Scales 2-7 mm long
6'Scales 0.5-1.3 mm long
7Sori in a single row between costa and margin, singly between each pair of veins, generally close to the costa, at most halfway to the margin, deeply sunken, visible as protrusions on the upper surface
7'Sori in several rows between costa and margin, or in 2 rows between the veins, superficial or slightly immersed
8Apex of the lobes rounded or acute, rhizome dorsiventrally flattened, with sclerified circumvascular sheaths, lamina herbaceous, lamina margin entire.
8'Apex of the lobes long-acuminate, rhizome terete, with scattered sclerenchyma strands, lamina membranaceous, lamina margin undulate.
9Lamina simple, scales distinctly spreading, narrowly ovate or triangular, margins usually intact
9'Lamina pinnatifid, scales appressed, circular or elliptic, often with eroded margins