Pteris - Pteridaceae

Pteris hamulosa (H. Christ) H. Christ

 

 

 

 

Synonyms

Pteris quadriaurita Retz. var. hamulosa H. Christ
Pteris acanthoneura Alston

Common name

Description

Rhizome up to 7 mm. in diameter, suberect, woody; rhizome scales up to 5mm long, narrowly linear subentire to lacerate, with a dark central stripe and pale margins. Stipe straw coloured to pale brown, darker at the base, 30-90 cm long. Frond tufted, erect to arching, thinly coriaceous, 0.6-1.5 m tall. Lamina up to 43 x 25 cm., oblong to broadly ovate in outline, 2-pinnate with 3-4 pairs of pinnae. Lower pinnae forked with the shorter lobe produced basiscopically. Pinnae set at an angle of c. 45ยบ to the rhachis, elliptic to narrowly oblong in outline, apex abruptly ending in a short tip, the upper pinnae narrowly decurrent; costae and sometimes costules spinose on the undersurface; ultimate lobes narrowly oblong in outline, apex rounded to sharply tipped, slightly curved like sickle, glabrous on both surfaces, sterile margins toothed; veins anastomosing only along the costa to form narrow areoles; rhachis stramineous, spinose. Sori marginal, extending for most of the length of the ultimate lobes; indusia entire, membranous.

Notes

This species can be recognized by a 2-pinnate lamina , anastomosing veins and costae that are spinose on the undersurface.

Derivation

hamulosa: hooked, referring to the spinose rhachis and costae on the undersurface of the fronds.

Habitat

In shade on wet forest floors.

Distribution worldwide

Distribution in Africa

Angola, Burundi, Cameroon, Central African Republic, Congo, Democratic Republic of Congo, Equatorial Guinea (incl. Bioko), Ghana, Guinea, Ivory Coast, Kenya, Mozambique, Nigeria, Sudan and South Sudan, Tanzania , Uganda.

Growth form

Terrestrial.

Literature

  • Jacobsen, W.B.G. (1983) The Ferns and Fern Allies of Southern Africa. Butterworths, Durban and Pretoria. Pages 243 - 244. (Includes a picture).
  • Roux, J.P. (2001) Conspectus of Southern African Pteridophyta. Southern African Botanical Diversity Network Report, 13 Page 81.
  • 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 173.
  • Schelpe, E.A.C.L.E. (1970) Pteridophyta. Flora Zambesiaca, 0 Pages 120 - 121.
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