Asplenium - Aspleniaceae

Asplenium hemitomum Hieron.

 

 

 

 

Synonyms

Asplenium christensenii Tardieu

Common name

Description

Rhizome erect, short; rhizome scales dark brown, ovate in outline, apex gradually tapering to a slender point. Fronds tufted, sub-coriaceous, 20-50 cm long. Stipe dark grey, 10-23 cm long, more or less the same lenght as the lamina, canaliculate in upper part, with scales similar to those of the rhizome. Lamina oblong in outline, imparipinnate, 10-35 x 7-14 cm. Pinnae 5-12 pairs, at an angle of 85° with the rhachis, (sub)opposite, petiolate, spaced, rhomboid and asymmetrical, 5-8 x 2-3 cm, base unequal, margin toothed, median lobe elongate (?), deltoid and toothed; terminal pinna often 3-lobed with acute lobes; pinnae with small narrow scales on lower surface. Rhachis compressed, green, sparsely set with scales. Sori linear in outline, 10-23 mm long, set along the veins forming an angle of c. 30° with the costa, not reaching the margin or the costa, some opening towards the costa, some towards the margin; indusium membranous, entire, 0.5-0.7 mm wide.

Notes

Close to A. warneckei but A. hemitomum has longer rhizome scales, a more leathery texture and irregularly reticulate spores (crested in A. warneckei).

Derivation

Habitat

Shaded riverine forest.

Distribution worldwide

Africa, Principe, São Tomé.

Distribution in Africa

Angola, Cameroon, Central African Republic, Congo, Dem. Republic of Congo, Equatorial Guinea (incl. Bioko), Gabon, Ghana, Guinea, Ivory Coast, Liberia, Nigeria, Sierra Leone.

Growth form

Epiphytic.

Literature

  • Beentje, H.J. (2008) Aspleniaceae. Flora of Tropical East Africa, Page 68.
  • 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 86 - 87.
  • Tardieu-Blot, M.-L. (1964) Ptéridophytes vol.3. Flore du Cameroun, Pages 203 - 204. (Includes a picture).
  • Thardieu-Blot, M.L. (1964) Ptéridophytes vol.8. Flore du Gabon, Page 135. (Includes a picture).
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