Blechnum - Blechnaceae

Blechnum ivohibense C. Chr.

Photo: P. Ballings
Zimbabwe

Photo: P. Ballings
Zimbabwe

Photo: P. Ballings
Zimbabwe

 

 

 

 

Synonyms

Blechnum bakeri C.Chr. var. glabra Bonap.
Blechnum bakeri C.Chr. var. glabrum Bonap.
Blechnum umbrosum Peter
Blechnum bakeri C. Chr. var. glabrum Bonap. ex Tardieu

Common name

Description

Rhizome erect to short creeping, up to 5 mm thick; rhizome scales dark brown to black, 3-7 x 1 mm, narrowly lanceolate to linear in outline, margins entire. Fronds whorled, dimorphic. Stipe up to 28 cm, longer in the fertile than in the sterile fronds. Sterile lamina 41 × 10 cm, deeply pinnatifid, narrowly elliptic in outline; pinnae narrowly triangular-oblong in outline, slightly falcate, glabrous, margins finely toothed, apex acute to rounded, base sessile. Fertile lamina as for sterile lamina, 28 x 4.5 cm, pinnae linear. Rhachis sparsely set with a few brown scales. Sori linear, appearing to cover the pinnae completely at dehiscence; indusium continuous, 0.1-0.3 mm wide.

Notes

Differs from similar species by having long, lax fertile fronds and fine serrations on the pinnae tips.

Derivation

ivohibense: named after Mt. Ivohibe in south-eastern Madagascar.

Habitat

Shaded streambanks in wet evergreen forest, in gorges and caves, under bridges, on soil banks and shaded vertical rock walls.

Distribution worldwide

Africa, Madagascar.

Distribution in Africa

Kenya, Malawi, Mozambique, Tanzania , Zimbabwe.

Growth form

Terrestrial.

Literature

  • Jacobsen, W.B.G. (1983) The Ferns and Fern Allies of Southern Africa. Butterworths, Durban and Pretoria. Pages 462 - 463. (Includes a picture).
  • Parris, B.S. (2006) Blechnaceae. Flora of Tropical East Africa, Royal botanic Garden, Kew. Page 4. (Includes a picture).
  • Roux, J.P. (2001) Conspectus of Southern African Pteridophyta. Southern African Botanical Diversity Network Report, 13 Page 154.
  • 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 103.
  • Schelpe, E.A.C.L.E. (1970) Pteridophyta. Flora Zambesiaca, 0 Page 237. (Includes a picture).
  •