Marsilea - Marsileaceae

Marsilea fenestrata Launert

 

 

 

 

Synonyms

Common name

Description

Floating form: stipe up to 20 cm long; leaflets obdeltate, 4-16 × 2-15 mm, outer margin rounded, shallowly sinuate to scalloped, hairless, with translucent streaks between the veins. Dry land form: stipe 2.5-9 cm long, leaflets narrowly obdeltate, 4-12 × 2-8 mm, outer margins deeply sinuate to incised, thinly set with long hairs above, sparser below, translucent streaks present. Sporocarps: clustered in fairly dense groups, ± 3.5 × 3 mm, roughly rectangular in outline, upper side straight to slightly concave, lower side curved, narrowly elliptic in dorsoventral cross-section; hairy when young becoming subglabrous when mature; lower tooth a shallow hump, upper tooth prominent, sharply acute, frequently curved; pedicels 2.5-7 mm, somewhat curved, ascending, free, many arising from the axils of the stipes.

Notes

Differs from M. ephippiocarpa by having sporacarps with unbranched, free, not united pedicels, leaves have distinctive translucent streaks.

Derivation

fenestra: with windows; referring to the translucent, longitudinal streaks in the leaflets.

Habitat

In mud on the edge of seasonal pans.

Distribution worldwide

See African distribution.

Distribution in Africa

Mozambique, South Africa, Swaziland.

Growth form

Aquatic, terrestrial.

Literature

  • Burrows, J.E. (1990) Southern African Ferns and Fern Allies. Frandsen, Sandton. Pages 72 - 73. (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 240 - 241. (Includes a picture).
  • Jacobsen, W.B.G. (1983) The Ferns and Fern Allies of Southern Africa. Butterworths, Durban and Pretoria. Pages 480 - 481. (Includes a picture).
  • 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 56.
  • Roux, J.P. (2001) Conspectus of Southern African Pteridophyta. Southern African Botanical Diversity Network Report, 13 Page 176.
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