1 | Scales on pinna-rachis narrow with inflexed edges or flat, their bases sometimes widened but not cordate nor point- attached; isodiametric cells few, near base. |
1' | Scales on pinna-rachis flat or nearly so, point- attached at a deeply cordate base; many isodiametric cells in their basal part |
2 | Basal basiscopic pinnules of basal pinnae not longest, less than twice as long as the basal acroscopic pinnules |
2' | Basal basiscopic pinnules of basal pinnae distincdy longer than the rest, usually twice as long as acroscopic ones |
3 | Veins thick and prominent on lower surface |
3' | Veins not prominent on lower surface, the smaller ones in many cases indistinct |
4 | Tertiary leaflets 3x3 mm, almost entire, their upper surface densely covered with short hairs |
4' | Tertiary leaflets, if present, differently shaped and not thus covered |
5 | Pinnules or lobes of middle pinnae not lobed nearly to their costae; spreading bristle- like scales present throughout the main rachis |
5' | Pinnules or lobes of middle pinnae lobed nearly to their costae; such scales not present |
6 | Scales on pinna-rachis flat or nearly so |
6' | Scales on pinna-rachis with inflexed edges, at least near their bases |
7 | Scales on pinna-rachis not widened at their bases; isodiametric cells at base few; costal scales very narrow |
7' | Scales on pinna-rachis widened at their bases, the widened part consisting entirely of isodiametric cells; costal scales with broad base |
8 | Stipe densely scaly throughout, scales at top of stipe 10 mm long |
8' | Stipe densely scaly near base only; distal scales 3 mm long. |
9 | Lamina opaque; smaller veins not distinct on lower surface. |
9' | Lamina not opaque; veins distinct |
10 | Scales on pinna-rachis very thin, few cells wide, lacking conspicuous isodiametric cells |
10' | Scales on pinna-rachis wider with reflexed margins, widened at their bases with some isodiametric cells |
11 | Indusium very small, hidden by sporangia at maturity, bearing long slender flexuous glands |
11' | Indusium distinct but fragile, not long-fringed |
12 | Basal basiscopic tertiary divisions of basal pinnae lobed |
12' | Basal basiscopic tertiary divisions of basal pinnae entire |
13 | Pinnae narrowly acuminate; appressed glands present on upper surface |
13' | Pinnae not narrowly acuminate; short erect capitate hairs present between veins on upper surface |
14 | Free pinnae to 8 pairs; basal pinnae of mature plants shorter than suprabasal ones |
14' | Free pinnae to c. 4 pairs; basal pinnae longer than suprabasal ones |
15 | Lobes of middle pinnae mostly subentire with rounded apices |
15' | Lobes of middle pinnae mostly lobulate, their apices not rounded |
16 | Lamina to 13 cm long, bearing many suberect hairs between veins on upper surface |
16' | Lamina much longer; hairs on upper surface appressed. |
17 | Tertiary leaflets of basal pinnae quite free, lobed to their costules, their basal lobes lobulate |
17' | Tertiary leaflets of basal pinnae adnate and less deeply lobed, their lobes entire. |
18 | Lobes of tertiary leaflets of basal pinnae deeply lobulate; thick cylindric glands copi ous on upper surface |
18' | Lobes of tertiary leaflets of basal pinnae not deeply lobulate; appressed glands on upper surface neither thick nor copious |
19 | Basal pinnae to 60 cm long |
19' | Basal pinnae to 25 cm long |
20 | Lobules or lobes of middle pinnae acute |
20' | Lobules or lobes of middle pinnae not acute |
21 | Basal tertiary leaflets lobed almost to their costules, lobes to 6 pairs. |
21' | Basal tertiary leaflets lobed less deeply with fewer lobes |
22 | Lamina to 60 cm long; basal pinnae more than 20 cm |
22' | Lamina rarely more than 35 cm long; basal pinna to 15 cm |
23 | Costules of basal basiscopic lobes of upper pinnae arising from the main rachis |
23' | Costules of basal basiscopic lobes of upper pinnae arising from costae of pinnae |
24 | Basal basiscopic pinnules of basal pinnae about twice as long as acroscopic ones. |
24' | Basal basiscopic pinnules of basal pinnae much less than twice as long as acroscopic ones |
25 | Tertiary leaflets of basal pinnae deeply lobed at their bases |
25' | Tertiary leaflets of basal pinnae lobed less than halfway to their costules |
26 | Tertiary leaflets to 18 × 10 mm; scales on rachis very narrow, not stiffly spreading |
26' | Tertiary leaflets to 8 × 4 mm; scales on rachis stiffly spreading |
27 | Tertiary leaflets of basal pinnae and lobes of distal pinnae widely spaced, narrow, falcate |
27' | Tertiary leaflets of basal pinnae and lobes of distal pinnae almost contiguous |