Arthropteris - Tectariaceae

Arthropteris monocarpa (Cordem.) C. Chr.

Photo: P. Ballings
Mozambique

Photo: P. Ballings
Malawi

Photo: P. Ballings
Malawi

Photo: P. Ballings
Malawi

 

 

 

 

Synonyms

Arthropteris anniana Lawalrée
Arthropteris charletiana Lawalrée
Dryopteris orientalis sensu Sim
Nephrodium albopunctatum sensu Sim
Nephrodium monocarpum Cordem.

Common name

Description

Rhizome widely creeping, c. 2 mm in diamater; rhizome scales subcircular to broadly ovate in outline, margins entire, up to 1.5 mm long, brown. Fronds monomorphic, spaced apart, erect to arching, thinly herbaceous. Stipe up to 18 cm, articulated near the base, pale brown, glabrous at maturity. Lamina deeply 2-pinnatifid and a pinnatifid terminal segment, oblong-lanceolate in outline, up to 33 × 12 cm; pinnae 13-17 alternate pairs, oblong-lanceolate in outline, apex tapering into a long drawn-out point, very broadly oblong at the base, basal 2 pairs of pinnae slightly reduced, subsessile to shortly petiolate, articulated to the rhachis, up to 7.5 × 1.5 cm; ultimate lobes oblong with rounded apices, up to 1 x 0.3 cm, hairless but with sparse white hairs along the veins, costules and costae below, white dots on the upper surface absent; rhachis with minute pale brown hairs. Sori circular, usually solitary in each lobe, but sometimes up to 6 per lobe, up to 1.5 mm in diameter; indusium c.1 mm in diameter, membraneous, entire.

Notes

Looks very much like A. orientalis which has a stipe that is articulated in the upper half and a row of white dots near the margins on the upper surface of the pinna lobes. A. orientalis is a woodland species while A. monocarpa is a forest fern.

Derivation

monocarpa: with one fruit; refers to a single sorus on each lobe of the frond, however this species can have up to 6 sori per pinna lobe.

Habitat

Shade in evergreen or riverine forest, usually on trunks of trees or treeferns, also on rockfaces or steep banks.

Distribution worldwide

Africa, Madagascar, Comoro Isl. and Réunion.

Distribution in Africa

Angola, Burundi, Cameroon, Congo, Dem. Republic of Congo, Equatorial Guinea (incl. Bioko), Ethiopia, Ghana, Guinea, Ivory Coast, Kenya, Liberia, Malawi, Mozambique, Nigeria, Rwanda, Sierra Leone, South Africa, Sudan and South Sudan, Swaziland, Tanzania , Uganda, Zambia, Zimbabwe.

Growth form

Epiphytic, lithophytic, terrestrial.

Literature

  • Burrows, J.E. (1990) Southern African Ferns and Fern Allies. Frandsen, Sandton. Page 207. (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 522 - 523. (Includes a picture).
  • Jacobsen, W.B.G. (1983) The Ferns and Fern Allies of Southern Africa. Butterworths, Durban and Pretoria. Pages 324 - 325. (Includes a picture).
  • Kornas, J. (1979) Distribution and ecology of the Pteridophytes in Zambia. Polska Akademia Nauk Wydzial II Nauk Biologicznych. Pages 113 - 114.
  • Roux, J.P. (2001) Conspectus of Southern African Pteridophyta. Southern African Botanical Diversity Network Report, 13 Page 143. (Includes a picture).
  • Roux, J.P. (2009) Synopsis of the Lycopodiophyta and Pteridophyta of Africa, Madagascar and neighbouring islands. Strelitzia 23, South African National Biodiversity Institute, Pretoria. Page 192.
  • Schelpe, E.A.C.L.E. (1970) Pteridophyta. Flora Zambesiaca, 0 Page 163. (Includes a picture).
  • Verdcourt, B. (2001) Oleandraceae. Flora of Tropical East Africa, Page 10. (Includes a picture).
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