Derivation of specific name
provided by Flora of Zimbabwe
lewalleana: type specimen was collected in Burundi by J. Lewalle, a Belgian botanist.
- license
- cc-by-nc
- copyright
- Mark Hyde, Bart Wursten and Petra Ballings
- bibliographic citation
- Hyde, M.A., Wursten, B.T. and Ballings, P. (2002-2014). Dryopteris lewalleana Pic.Serm. Flora of Zimbabwe website. Accessed 28 August 2014 at http://www.zimbabweflora.co.zw/speciesdata/species.php?species_id=101860
- author
- Mark Hyde
- author
- Bart Wursten
- author
- Petra Ballings
Description
provided by Flora of Zimbabwe
Rhizome shortly-creeping, becoming erect at the growing tip, up to 160 × 25 mm; rhizome scales straw- to rust-coloured, ovate to linear-acuminate, up to 18 × 4 mm, margins entire or with a few outgrowths, apex thread-like.
Fronds tufted to spaced at rhizome apex, suberect to arching, up to 1.35 m long, herbaceous.
Stipe up to 67 cm long, pale brown to greenish above, chestnut-coloured below, with straw- to rust-coloured scales, ovate to narrowly lanceolate, up to 25 × 6 mm, denser near the base.
Lamina up to 73 × 64 cm, ovate to deltate in outline, 3-pinnatifid to 3-pinnate, up to 14 pairs of pinnae, spaced below and somewhat overlapping near the lamina apex.
Pinnae up to 32 × 25 cm, forming an angle of 70-80° from the rhachis, usually not reduced and basiscopically developed, basal pair inequilaterally triangular to deltate in outline.
Pinnules: acroscopic pinnule smaller than basiscopic pinnule on basal pinnae; ultimate segments narrowly ovate-obtuse to oblong-obtuse, shallowly to deeply lobed, margins serrate, glabrous on both surfaces but with a few minute hairs and scales along the costules and costae, costules narrowly winged for most of the length.
Rhachis straw-coloured with a few straw-to rust-coloured scales similar to but smaller than those on the stipe, narrowly winged towards the apex.
Sori round, c. 1.6 mm in diameter, medial on the veins; indusia kidney-shaped, entire, persistent, brown, up to 1.6 mm in diameter, glabrous.
- license
- cc-by-nc
- copyright
- Mark Hyde, Bart Wursten and Petra Ballings
- bibliographic citation
- Hyde, M.A., Wursten, B.T. and Ballings, P. (2002-2014). Dryopteris lewalleana Pic.Serm. Flora of Zimbabwe website. Accessed 28 August 2014 at http://www.zimbabweflora.co.zw/speciesdata/species.php?species_id=101860
- author
- Mark Hyde
- author
- Bart Wursten
- author
- Petra Ballings
Worldwide distribution
provided by Flora of Zimbabwe
Southern Africa, extending to central and east Africa.
- license
- cc-by-nc
- copyright
- Mark Hyde, Bart Wursten and Petra Ballings
- bibliographic citation
- Hyde, M.A., Wursten, B.T. and Ballings, P. (2002-2014). Dryopteris lewalleana Pic.Serm. Flora of Zimbabwe website. Accessed 28 August 2014 at http://www.zimbabweflora.co.zw/speciesdata/species.php?species_id=101860
- author
- Mark Hyde
- author
- Bart Wursten
- author
- Petra Ballings