Rumohra adiantiformis (G. Forst.) Ching

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Synonyms: Dryopteris adiantiformis (G.Forst.) Kunze
Polypodium adiantiforme G. Forst.
Common names: Knysna fern (English) Leatherleaf fern (English)
Frequency: Local and rare.
Status: Native
Rhizome widely creeping above ground, up to 10 mm in diameter; rhizome scales up to 16 × 5.5 mm, margin entire, reddish-brown, ovate to lanceolate, hairpointed, dense. Fronds spaced, very coriacous, erect, rigid, shiny above, paler below. Stipe up to 50 cm long, matt pale brown, grooved above, set with brown ovate scales towards the base, subglabrous with age. Lamina deltate to broadly ovate in outline, basal pinnae basiscopically developed,tripinnatifid to quadripinnate, apex pinnatifid-deltate, up to 50 × 35 cm. Pinnules pinnatifid to dentate, ovate in outline, base unequally cuneate, upper surface glabrous, lower surface sparsely set with a few scales along the veins. Rhachis stramineous to brown, grooved, costae and costules scaly in young fronds. Sori round, large, usually one per lobe; indusia c. 2.2 mm in diameter, round, thick, coriaceous, peltate, glabrous, shed at maturity.
Notes: So far in Mozambique only known from a single record right at the summit of Mt Binga.
The secondary rhachis and costae do not have raised edges on the upper surface, the fronds are very leathery, the rhizome creeps above ground and is densely set in papery, rusty coloured scales.
Derivation of specific name: adiantiformis: shaped like Adiantum; unclear reference since the fronds of the species of the genus Adiantum do not compare to Rumohra adiantiformis.
Habitat: In Quartzite sandstone crac on Mt Binga.
Altitude range: 2436 m (approx)
Worldwide distribution: South Africa, Mozambique and Zimbabwe. Also known from Madagascar, Comoro and Mascarene islands, Australia, New Zealand, Polynesia, South and Central America.
Mozambique distribution: MS
Growth form(s): Epiphyte, lithophyte, terrestrial.
Endemic status:
Red data list status:
Insects associated with this species:
Spot characters: Display spot characters for this species

Burrows, J.E. (1990). Southern African Ferns and Fern Allies. Frandsen, Sandton. Page 320. (Includes a picture).

Crouch, N.R., Klopper, R.R., Burrows, J.E. & Burrows, S.M. (2011). Ferns of Southern Africa, A comprehensive guide Struik Nature Pages 488 - 489. (Includes a picture).

Jacobsen, W.B.G. (1983). The Ferns and Fern Allies of Southern Africa. Butterworths, Durban and Pretoria. Pages 457 - 458. (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 6.

Roux, J.P. (2001). Conspectus of Southern African Pteridophyta. Southern African Botanical Diversity Network Report 13 Page 123. (Includes a picture).

Roux, J.P. (2009). Synopsis of the Lycopodiophyta and Pteridophyta of Africa, Madagascar and neighbouring islands Pages 139 - 140.

Other sources of information about Rumohra adiantiformis:

Our websites:

Flora of Zimbabwe: Rumohra adiantiformis

External websites:

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

Copyright: Mark Hyde, Bart Wursten, Petra Ballings and Meg Coates Palgrave 2007-23

Hyde, M.A., Wursten, B.T., Ballings, P. & Coates Palgrave, M. (2023). Flora of Mozambique: Species information: Rumohra adiantiformis., retrieved 10 December 2023

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