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| Description: |
Rhizome long-creeping, slender; rhizome scales triangular in outline, apex gradually tapering to a point, base cordate, 0.2–1.2 mm long, 0.3–0.4 mm wide, pale brown or dark-marked, mixed with multicellular hairs. Fronds monomorphic, few, paired or solitary, 15–40 cm tall. Stipe 12–24.5 cm long, minutely pubescent or ± glabrous or with few scales at base. Lamina essentially trifid, the apical part pinnate with 12 or more pairs of pinnae, ± triangular-hastate in outline, 11.5–22 x 12–26 cm, with scattered flattened white multicellular hairs; pinnae lanceolate in outline, apex gradually tapering to a point, up to 5 x 1.8 cm, deeply pinnatifid with ± 10 pairs of pinnatifid segments about 2–7 mm wide; lateral parts similar to apical but with lowest basiscopic pinna well developed, up to 10 cm long; rhachis shortly pubescent. Sori 1–10 per segment, round, ± 1 mm in diameter; indusium sub-reniform, fixed on one side only, persistent or ± disintegrating and scarcely visible. |
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| Notes: | |
| Derivation of specific name: | lewalleanum: type specimen was collected in Burundi by J. Lewalle, a Belgian botanist. |
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| Worldwide distribution: | Burundi, Tanzania |
| Growth form(s): | Terrestrial. |
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| Spot characters: | Display spot characters for this species |
| Literature: |
Ntore, S. & al. (2024). Checklist of the vascular plants of Burundi Page 29. |