Dryopteris lewalleana Pic.Serm.

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Synonyms: Aspidium pentagonum (T.Moore) Kuhn
Dryopteris inaequalis (Schltdl.) var. atropaleacea Schelpe
Lastrea pentagona T.Moore
Common names:
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.
Notes: Could be confused with Dryopteris pentheri which has basal pinnae inequilaterally ovate, with the basal basiscopic pinnule shorter than the 2 or 3 adjacent pinnules and narrowly lanceolate to filiform stipe scales.
Derivation of specific name: lewalleana: type specimen was collected in Burundi by J. Lewalle, a Belgian botanist.
Habitat: Terrestrial, in seasonally moist conditions among rocks, along streams in evergreen forests, in light and deep shade.
Altitude range: (metres) 200 - 2590 m
Worldwide distribution: Southern Africa, extending to central and east Africa.
Zimbabwe distribution: E
Growth form(s): Terrestrial.
Endemic status:
Red data list status:
Insects associated with this species:
Spot characters: Display spot characters for this species

Crouch, N.R., Klopper, R.R., Burrows, J.E. & Burrows, S.M. (2011). Ferns of Southern Africa, A comprehensive guide Struik Nature Pages 476 - 477. (Includes a picture).

Da Silva, M.C., Izidine, S. & Amude, A.B. (2004). A preliminary checklist of the vascular plants of Mozambique. Southern African Botanical Diversity Network Report No. 30 Sabonet, Pretoria Page 10.

Kornas, J. (1979). Distribution and ecology of the Pteridophytes in Zambia Polska Akademia Nauk Wydzial II Nauk Biologicznych Page 108. As Dryopteris inaequalis var. atropaleaceae

Mapaura, A. & Timberlake, J. (eds) (2004). A checklist of Zimbabwean vascular plants Southern African Botanical Diversity Network Report No. 33 Sabonet, Pretoria and Harare Page 6.

Roux, J.P. (2001). Conspectus of Southern African Pteridophyta. Southern African Botanical Diversity Network Report 13 Page 125.

Roux, J.P. (2009). Synopsis of the Lycopodiophyta and Pteridophyta of Africa, Madagascar and neighbouring islands Page 122.

Schelpe, E.A.C.L.E. (1970). Pteridophyta Flora Zambesiaca Page 222. As Dryopteris inaequalis var. atropaleacea

Other sources of information about Dryopteris lewalleana:

Our websites:

Flora of Caprivi: cultivated Dryopteris lewalleana
Flora of Malawi: Dryopteris lewalleana
Flora of Mozambique: Dryopteris lewalleana
Flora of Zambia: Dryopteris lewalleana

External websites:

African Plants: A Photo Guide (Senckenberg): Dryopteris lewalleana
BHL (Biodiversity Heritage Library): Dryopteris lewalleana
EOL (Encyclopedia of Life): Dryopteris lewalleana
GBIF (Global Biodiversity Information Facility): Dryopteris lewalleana
Google: Web - Images - Scholar
iNaturalist: Dryopteris lewalleana
IPNI (International Plant Names Index): Dryopteris lewalleana
JSTOR Plant Science: Dryopteris lewalleana
Mansfeld World Database of Agricultural and Horticultural Crops: Dryopteris lewalleana
Plants of the World Online: Dryopteris lewalleana
Tropicos: Dryopteris lewalleana
Wikipedia: Dryopteris lewalleana

Copyright: Mark Hyde, Bart Wursten, Petra Ballings and Meg Coates Palgrave, 2002-24

Hyde, M.A., Wursten, B.T., Ballings, P. & Coates Palgrave, M. (2024). Flora of Zimbabwe: Species information: Dryopteris lewalleana.
https://www.zimbabweflora.co.zw/speciesdata/species.php?species_id=101860, retrieved 1 March 2024

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