Asplenium - Aspleniaceae

Asplenium megalura Hieron.

Photo: JE. Burrows
Unknown locality

Photo: JE. Burrows
Malawi

 

 

 

 

Synonyms

Asplenium molleri Hieron.
Asplenium dimidiatum Sw. var. longicaudatum Hieron.
Asplenium megalura Hieron. ex Brause var. molleri (Hieron.) Tardieu
Asplenium megalura Hieron. ex Brause var. exhaustoides G. Kunkel

Common name

Description

Rhizome erect or shortly creeping, to 5 mm diameter; rhizome scales dark brown, narrowly lanceolate, entire, up to 6 mm long with narrow pale brown borders, apex gradually tapering to a point and ending in hair-tip. Fronds tufted, rarely shortly spaced, arching, firmly membranous, not proliferous. Stipe shiny dark brown or greyish, up to 19 cm, glabrous except at the very base. Lamina up to 43 x 13 cm, 1-pinnate, narrowly oblong in outline, lowest pinnae not reduced, apical segment resembling others, often tricuspidate. Pinnae (sub-)opposite, subsessile, trapeziform in outline, 3-lobed, up to 9 x 4 cm, up to 11 pairs, base wedge-shaped, lower margin entire, apex abruptly ending in a very long tip, the distal margin and tip irregularly toothed, glabrous on both surfaces or with some scattered tiny lobed scales to 0.5 mm, veins flabellate, costa not clear. Rachis shiny dark brown, shallowly channelled ventrally, glabrous except for a few very small scales. Sori many per pinna, along veins, linear, (3–)5–20 mm long; indusium linear, membranous, entire, 0.4–0.5 mm wide.

Notes

Differs from similar species by having pinnae with an apex that abruptly ends in a very long tip, this species is not proliferous.

Derivation

Habitat

Literature states that this fern is found in wet forests, often near streams. In Malawi I found this species growing on rocky outcrops in montane grassland.

Distribution worldwide

See African distribution.

Distribution in Africa

Burundi, Cameroon, Dem. Republic of Congo, Equatorial Guinea (incl. Bioko), Gabon, Ghana, Guinea, Ivory Coast, Kenya, Liberia, Malawi, Mozambique, Rwanda, Sierra Leone, Sudan and South Sudan, Tanzania , Togo, Uganda, Zambia.

Growth form

Epiphytic, lithophytic.

Literature

  • Beentje, H.J. (2008) Aspleniaceae. Flora of Tropical East Africa, Pages 24 - 26. (Includes a picture).
  • Kornas, J. (1979) Distribution and ecology of the Pteridophytes in Zambia. Polska Akademia Nauk Wydzial II Nauk Biologicznych. Page 101.
  • Roux, J.P. (2001) Conspectus of Southern African Pteridophyta. Southern African Botanical Diversity Network Report, 13 Page 168.
  • Roux, J.P. (2009) Synopsis of the Lycopodiophyta and Pteridophyta of Africa, Madagascar and neighbouring islands. Strelitzia 23, South African National Biodiversity Institute, Pretoria. Pages 90 - 91.
  • Schelpe, E.A.C.L.E. (1970) Pteridophyta. Flora Zambesiaca, 0 Pages 180 - 181.
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