Ophioglossum - Ophioglossaceae

Ophioglossum rubellum Welw. ex A.Braun

Photo: JE. Burrows
Zimbabwe

Photo: JE. Burrows
South Africa

Photo: JE. Burrows
South Africa

 

 

 

 

Synonyms

Common name

Description

Rhizome pear-shaped to rounded or narrowly oval, (1.5-)3-11(-19) × 1-5 mm; roots dense, descending, wiry, proliferous. Leaves mostly 2 (1-3), held at 20° from the horizontal or appressed to the ground, dark green often with a reddish to orange coloration. Stipe up to 2 cm long, subterranean for most of its length (75-90%), stipe:lamina lenght ratio 1.7-1.2:1. Sterile lamina up to 17 × 10 mm, elliptic to broadly ovate in outline, apex pointed to sometimes rounded, base wedge-shaped to truncate, with an apparent pale pseudo-midrib formed towards the base of the lamina only. Fertile segment up to 7.2(-9.3) cm long, inserted at the base of the lamina, fertile spike:lamina lenght ratio 2.1-5.6:1. Sporangia 3-17 pairs, apex pointed.

Notes

Could be mistaken for O. costatum which usually has dull green leaves that are held at 60-80° of the ground and a prominent pale pseudo-midrib. O. convexum has linear dull green leaves held at 0-30% from the horizontal, the pale pseudo-midrib is absent.

Derivation

rubellum: reddish; referring to the reddish to orange coloration present in the leaves.

Habitat

Seasonally moist sandy soils overlying granite or sandstone in mixed deciduous woodland.

Distribution worldwide

See African distribution.

Distribution in Africa

Angola, Central African Republic, Ethiopia, Gabon, Ghana, Kenya, Malawi, Sierra Leone, South Africa, Tanzania , Uganda, Zambia, Zimbabwe.

Growth form

Terrestrial.

Literature

  • Burrows, J.E. (1990) Southern African Ferns and Fern Allies. Frandsen, Sandton. Page 47. (Includes a picture).
  • Burrows, J.E. & Johns, R.J. (2001) Ophioglossaceae. Flora of Tropical East Africa, Royal Botanic Gardens, Kew . Pages 8 - 10. (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 126 - 127. (Includes a picture).
  • Kornas, J. (1979) Distribution and ecology of the Pteridophytes in Zambia. Polska Akademia Nauk Wydzial II Nauk Biologicznych. Page 38.
  • Roux, J.P. (2001) Conspectus of Southern African Pteridophyta. Southern African Botanical Diversity Network Report, 13 Page 34.
  • 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 35.
  • Schelpe, E.A.C.L.E. (1970) Pteridophyta. Flora Zambesiaca, 0 Page 35. (Includes a picture).
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