1 | Fronds usually bipinnatifid apart from basal pinnae; pinnules, if present, mostly adnate to pinna-rachis; many additional areoles always present below sinuses between lobes; sinus-teeth only evident in larger sinuses |
1' | Fronds amply bipinnate on mature plants, most pinnules not adnate; areoles few be low sinuses; sinus-teeth always evident |
2 | Fronds normally bipinnatifid, the largest sometimes bipinnate near the base; sori scat tered irregularly, very abundant |
2' | Fronds, at least in basal parts, bipinnate with lobed pinnules; sori all, or almost all, arranged in one row on each side of costules of pinnule-lobes |
3 | Sori midway between costules and margins of pinnule-lobes and also some on basal veins |
3' | Sori close to margins of pinnule-lobes, lacking on basal veins |
4 | Pinnules of suprabasal pinnae acuminate, to 12 cm long and 2 cm wide at their broadly cuneate bases, not adnate to pinna-rachis |
4' | Pinnules of suprabasal pinnae to 4 × 0.8 cm with blunt apices, adnate to pinna-rachis |
5 | Sori present on all vein-branches, in more than 1 row on each side of costules, sev eral sori irregularly arranged on veins below sinuses |
5' | Sori almost always in a single row on each side of the costules (sometimes on both branches of a vein), additional ones below sinuses few |
6 | Sori indusiate |
6' | Sori exindusiate |
7 | Pinnules of middle pinnae lobed c. 2/5 towards costules, lobes distinctly falcate; sinus-teeth narrow |
7' | Pinnules more deeply lobed; sinus-teeth triangular |
8 | Pinnules short-acuminate, lobes obtuse |
8' | Pinnules long- acuminate, lobes acute |
9 | Pinnule-lobes subentire (small teeth distally) |
9' | Pinnule-lobes crenate to lobulate |
10 | Stipe dark, glossy; pinnules to 25 × 5 cm, pinnate for half their length |
10' | Stipe not dark and glossy; largest pinnules not thus pinnate |
11 | Pinnules to 15 × 3 cm, their lobes lobulate, drying brown-olivaceous |
11' | Pinnules commonly 8 × 1.8 cm, their lobes crenate, drying greenish |
12 | Pinnules lobed about 2/3 towards costa; lobes entire or at most minutely crenate-dentate |
12' | Pinnules lobed more deeply or not; lobes distinctly crenate |
13 | Costules 4-4.5 mm apart; several costular areoles present; basal scales to 5 cm long, 3 mm wide at base |
13' | Costules to 6 mm apart; few costular areoles present; basal scales shorter and narrower |
14 | Sinus-teeth narrow, short, in base of sinus |
14' | Sinus-teeth broadly triangular, on basiscopic side of base of sinus |
15 | Pinnules of suprabasal pinnae to 4.5 cm wide, their lobes acute |
15' | Pinnules of suprabasal pinnae to 2.5 cm wide, their lobes obtuse |
16 | Pinnules all lobed to c. 1 mm from costa, to 2.5 cm wide, spores not spinulose |
16' | Pinnules lobed less deeply, narrower; spores spinulose |