Asplenium unilaterale Lam.

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Asplenium unilaterale

Photo: Petra Ballings

Asplenium unilaterale

Photo: Petra Ballings

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Synonyms: Asplenium resectum Sm.
Asplenium unilaterale Lam. var. majus (C.Chr.) Sledge
Hymenasplenium unilaterale (Lam.) Hayata
Common names:
Frequency: Rare
Status: Native
Rhizome creeping, c.3 mm thick; scales up to 2 mm long, dark brown, lanceolate, margins entire. Fronds spaced apart. Stipe up to 13 cm long, stipe and rhachis glabrous, dark brown to almost black. Lamina 23.5 × 5 cm, pinnate, narrowly elliptic to oblong in outline. Pinnae glabrous, narrowly triangular-rhombic or shaped like a parallelogram, upper margin toothed to lobed, costa forming the lower margin for about 1/2 to 3/4 of the pinna length. Sori oval-linear, set along the veins towards the apex of the pinnae, indusium entire.
Notes: Rare fern only recorded from Chirinda forest.
It is easily recognisable by the costa forming the lower edge of the pinna for 1/2 to 3/4 of its length. and differs from A. obscurum by having a dark brown to almost black stipe and smaller sori (± 3 mm long) that are sparsely scattered towards the pinna apex.
Derivation of specific name: unilaterale: one-sided, referring to the form of the pinnae.
Habitat: Deeply shaded stream banks in evergreen forest. Terrestrial or lithophyte.
Altitude range: (metres) 1000 - 1200 m
Worldwide distribution: Angola, Bioko, Cameroon, Central African Republic, Cote d'Ivoire, Ethiopia, Ghana, Guinea, Kenya, Liberia, Malawi, Niger, Nigeria, Principe, Soa Tomé, Sierra Leone,Sudan, Tanzania, Uganda, Zimbabwe, Madagascan region
Zimbabwe distribution: E
Growth form(s): Lithophyte, terrestrial.
Endemic status:
Red data list status: Vulnerable
Insects associated with this species:
Spot characters: Display spot characters for this species
Images last updated: Saturday 19 November 2011

Burrows, J.E. (1990). Southern African Ferns and Fern Allies. Frandsen, Sandton. Page 222. (Includes a picture).

Burrows, J.E. & Burrows, S.M. (1993). An annotated check-list of the pteridophytes of Malawi Kirkia 14(1) Page 92.

Crouch, N.R., Klopper, R.R., Burrows, J.E. & Burrows, S.M. (2011). Ferns of Southern Africa, A comprehensive guide Struik Nature Pages 600 - 601. (Includes a picture).

Dowsett-Lemaire, F. (1989). The flora and phytogeography of the evergreen forests of Malawi. I: Afromontane and mid-altitude forests; Bull. Jard. Bot. Nat. Belg. 59(1/2) Page 25.

Golding, J.S. (ed.) (2002). Zimbabwe Plant Red Data List. Southern African Plant Red Data Lists. SABONET 14 Page 162.

Jacobsen, W.B.G. (1983). The Ferns and Fern Allies of Southern Africa. Butterworths, Durban and Pretoria. Pages 340 - 341. (Includes a picture).

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 5.

Roux, J.P. (2001). Conspectus of Southern African Pteridophyta. Southern African Botanical Diversity Network Report 13 Page 172. (Includes a picture).

Roux, J.P. (2009). Synopsis of the Lycopodiophyta and Pteridophyta of Africa, Madagascar and neighbouring islands Pages 99 - 100.

Schelpe, E.A.C.L.E. (1970). Pteridophyta Flora Zambesiaca Page 174.

Other sources of information about Asplenium unilaterale:

Our websites:

Flora of Malawi: Asplenium unilaterale

External websites:

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

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: Asplenium unilaterale., retrieved 17 April 2024

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