Crepidomanes - Hymenophyllaceae

Crepidomanes mannii (Hook) J.P.Roux

Photo: BT. Wursten
Dem. Republic of Congo

Photo: BT. Wursten
Dem. Republic of Congo

Photo: BT. Wursten
Dem. Republic of Congo






Trichomanes mannii Hook.
Trichomanes angustilaciniatum Bonap.
Trichomanes mannianum Mett. ex Kuhn
Gonocormus mannii (Hook.) G.Kunkel
Trichomanes trinerve Baker

Common name


Rhizome long-creeping, threadlike, branched, with dense light to dark brown hairs to 0.8 mm. Fronds spaced. Stipe 1–2.5 cm long, sometimes proliferous, not winged, glabrous except at the very base. Lamina dark green, suborbicular to ovoid or rhomboid in outline, irregular, up to 5(–9) x 3 cm, palmately or flabellately and dichotomously dissected, the segments sometimes themselves pinnatifid, occasionally 2-pinnatifid, base wedge-shaped. Ultimate segments ± 0.5 mm wide, apex rounded or notched; with longitudinal folds on drying. Sori up to 8 in number, marginal, often axillary in the sinuses between the lobes in the upper part of the lamina; indusium cone- to bell-shaped, up to 1.8 ×0.8 mm, minutely winged, mouth widened to 1 mm, wavy, scarcely 2-lipped; receptacle often exserted.



mannii: in honor of Gustav Mann (1836-1916), German botanist, Kew gardener, plant collector, botanical explorer, Indian Forest Service 1863-1891, a member of William Balfour Baikie's Niger expedition 1859-1862, and British colonial repres


On wet rocks or lower parts of tree trunks in moist shady forests.

Distribution worldwide

Africa, Madagascar, Comoro and Mascarene Islands.

Distribution in Africa

Angola, Burundi, Cameroon, Central African Republic, Congo, Dem. Republic of Congo, Equatorial Guinea (incl. Bioko), Gabon, Guinea, Ivory Coast, Kenya, Liberia, Malawi, Nigeria, Rwanda, Senegal, Sierra Leone, Sudan and South Sudan, Tanzania , Togo, Uganda, Zambia.

Growth form

Epiphytic, lithophytic.


  • Beentje, H.J. (2008) Hymenophyllaceae.Flora of Tropical East Africa, Pages 22 - 24. (Includes a picture).
  • Kornas, J. (1979) Distribution and ecology of the Pteridophytes in Zambia. Polska Akademia Nauk Wydzial II Nauk Biologicznych. Page 72. As Trichomanes manii Hook.
  • Roux, J.P. (2001) Conspectus of Southern African Pteridophyta.Southern African Botanical Diversity Network Report, 13 Pages 45 - 46.
  • 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 40.
  • Roux, J.P. (2000) Pteridophyta; a new combination and new records for the flora of Malawi.Bothalia, 30(2) Page 155.
  • Tardieu-Blot, M.-L. (1964) Ptéridophytes vol.3.Flore du Cameroun, Pages 83 - 84.
  • Thardieu-Blot, M.L. (1964) Ptéridophytes vol.8.Flore du Gabon, Page 63. As Trichomanes mannii Hooker