1 | Indusium scaly, attached at the narrow, cordate base only |
1' | Indusium attached at the base and only part of the sides or also attached along the sides and pouch-shaped, or only attached at broad base and hardly or not at sides, or very small and inconspicuous |
2 | Leaves usually bipinnate. Indusium semicircular or oblong; scales basifixed with cordate base and greatly overlapping lobes, longest petiolules 1 mm long, longest pinnules or pinna lobes 15-32 by 3-10 mm, indusium longer than wide or about as wide as long |
2' | Leaves usually pinnate with strongly dissected pinnae. Indusium reniform, wider than long; scales peltate; longest petiolules 2-3 mm long; longest pinnules or pinna lobes 12-17 by 3-5 mm |
3 | Indusium attached at the broad base and hardly or not at sides, semicircular, wider than long; scales with pale border from base to apex or this quickly diminishing or disappearing towards the apex, flat and nearly acicular |
3' | Indusium attached at the base and only part of the sides or also attached along the sides, pouch-shaped, or very small, inconspicuous, more or less triangular to rhomboid or oblong, longer than wide or about as wide as long; scales without pale bor-der, distinctly acicular |
4 | Indusium very small, inconspicuous |
4' | Indusium conspicuous, attached at the base and only part of the sides or also attached along the sides, pouch-shaped |
5 | Scales basifixed with cordate base and much overlapping lobes |
5' | Scales peltate |
6 | Indusium longer than wide with free pointed upper half, at least as long as basal half |
6' | Indusium longer than wide or about as wide as long, without free pointed upper half |