Cyclosorus - Thelypteridaceae

Cyclosorus striatus (Schumach.) Ching

 

 

 

 

Synonyms

Aspidium striatum Schumach.
Dryopteris striata (Schumach.) C.Chr.
Thelypteris striata (Schumach.) Schelpe
Polipodium pallidivenium Hook.
Dryopteris hemitelioides Christ.

Common name

Description

Rhizome up to 5 mm. in diameter, widely creeping, rhizome scales dark-brown, ovate in outline, apex gradually tapering to a sharp point, margin entire, up to 2 mm. long. Frond erect, spaced up to 15 cm. apart, non-proliferous, firmly herbaceous. Stipe up to 90 cm. long, pale-brown, becoming very dark at the base, glabrous. Lamina up to 77 x 25 cm, 2-pinnatifid, narrowly oblong-ovate in outline, acute, the basal pinnae not reduced; pinnae up to 21 x 2.5 cm., narrowly oblong or attenuate in outline often somewhat contracted towards the base, incised more than 1/2-way to the costa into oblong to narrowly oblong often slightly falcate subacute lobes up to 6 mm. broad, usually with more than 18 pairs of veins per lobe, the basal pair anastomosing below the sinus, the sub-basal pair reaching the sinus, glabrous ventrally except for a pilose costa, densely to thinly pilose on the costa, costules, veins and lamina dorsally. Rhachis mostly glabrous with age but thinly pilose at first with stiff white hairs. Sori circular, up to 35 per pinna lobe, contiguous at maturity, borne 1/2-way between the costule and margin; indusium c. 0.5 mm. in diameter, thinly pilose.

Notes

May be confused with C. interruptus which has less veins per lobe (6-13) and pinnae that are incised only half way to the costa.

Derivation

Habitat

Papyrus swamp and swamp forest.

Distribution worldwide

Widespread in tropical Africa

Distribution in Africa

Burkina Fasso, Burundi, Democratic Republic of Congo, Equatorial Guinea (incl. Bioko), Guinea Bissau, Liberia, Rwanda, Sierra Leone, Sudan and South Sudan, Tanzania .

Growth form

Terrestrial.

Literature

  • Kornas, J. (1979) Distribution and ecology of the Pteridophytes in Zambia. Polska Akademia Nauk Wydzial II Nauk Biologicznych. Page 93. As Thelypteris striata
  • 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 205.
  • Schelpe, E.A.C.L.E. (1970) Pteridophyta. Flora Zambesiaca, 0 Page 199. As Thelypteris striata
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