Christella - Thelypteridaceae

Christella friesii (Brause) Holttum

 

 

 

 

Synonyms

Thelypteris friesii (Brause) Schelpe
Dryopteris friesii Brause

Common name

Description

Rhizome short creeping; rhizome scales up to 4.5 mm long, dark brown, lanceolate, entire. Fronds closely spaced, erect, not proliferous, firmly membranous. Stipe up to 38 (85) cm long, pale brown, thinly set with minute white hairs. Lamina up to 1.7 × 0.6 m, narrowly oblong to roughly lanceolate in outline, deeply 2-pinnatifid, apex acute, basal 2 pairs of pinnae slightly reduced, then abruptly ending in a long series of much reduced pinnae, often less than 2 cm long. Pinnae linear-lanceolate in outline, apex tapering to a point, base truncate; ultimate lobes narrowly linear-oblong, falcate, margins entire to lobed; upper surface with hairs along the veins, costules and costae, lower surface hairs along the costae; veins not meeting below the sinus. Rhachis strawcoloured to pale brown, finely covered with short hairs. Sori round, up to 20 per lobe; indusia c. 0.5- 1 mm in diameter, circular to kidney-shaped with a few white hairs.

Notes

C. friesii look for: creeping rhizome, veins not meeting below the sinus between the pinna lobes, stipe with a series of much reduced pinnae.

Derivation

friesii: named after R.E. Fries, Swedish botanist and editor of Botanik 1 (1914), who collected this species for the first time in Zambia in 1911.

Habitat

Streambanks in light shade of evergreen forest.

Distribution worldwide

Angola, Cameroon, Congo, DRC, Kenya, Malawi, Tanzania, Zambia, Zimbabwe.

Distribution in Africa

Angola, Cameroon, Congo, Dem. Republic of Congo, Kenya, Malawi, Tanzania , Zambia, Zimbabwe.

Growth form

Terrestrial.

Literature

  • Burrows, J.E. (1990) Southern African Ferns and Fern Allies. Frandsen, Sandton. Pages 260 - 261. As Thelypteris friesii (Includes a picture).
  • Jacobsen, W.B.G. (1983) The Ferns and Fern Allies of Southern Africa. Butterworths, Durban and Pretoria. Pages 389 - 390. (Includes a picture).
  • Kornas, J. (1979) Distribution and ecology of the Pteridophytes in Zambia. Polska Akademia Nauk Wydzial II Nauk Biologicznych. Pages 90 - 91. As Thelypteris friesii
  • Roux, J.P. (2001) Conspectus of Southern African Pteridophyta. Southern African Botanical Diversity Network Report, 13 Page 121.
  • 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 203.
  • Schelpe, E.A.C.L.E. (1970) Pteridophyta. Flora Zambesiaca, 0 Pages 192 - 193. As Thelypteris friesii
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