Marsilea apposita Launert

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Photo: Petra Ballings
SRGH

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Synonyms:
Common names:
Frequency:
Status:	Native
Description:	Floating form: stipe up to 30 cm long, usually hairless. Leaflets up to 26 × 25 mm, broadly obdeltate, outer margin rounded, entire, hairless. Dry land form: stipe up to 8 cm long. Leaflets ± 7 × 5 mm, narrowly obdeltate, outer margins deeply crenate, slightly hairy at beginning. Sporocarps: 3-4 mm long, 2-3.25 mm high, 1.5-2 mm thick, brown, almost rectangular in lateral view, upper side shallowly concave, under side convex, outer side rounded, vertical cross-section narrowly rectangular, continuous shallow groove from upper over outer and along lower side; densely hairy when young becoming hairless with age; inferior tooth a shallow hump or absent, superior tooth rather short, subacute; lateral ribs hardly visible in mature specimens; pedicels up to 8 mm long, cylindrical, wiry, erect or arching, 2 or 3 uniting at the base, sometimes solitary, arising from the axil of the stipe.
Notes:	Recognizable by the prominent upper tooth on the sporocarp, 2 or 3 pedicels uniting at base, sporocarps rectangular outline in vertical cross-section
Derivation of specific name:	apposita: side by side, the pedicels are united in twos or threes at the base giving the sporocarps a closely packed appearance.
Habitat:	Sandy wet soil in river beds, edge of seasonal pools.
Altitude range: (metres)	200 - 1400 m
Worldwide distribution:	Botswana, South Africa, Zimbabwe
Zimbabwe distribution:	N,W,C
Growth form(s):	Aquatic, terrestrial.
Endemic status:
Red data list status:
Insects associated with this species:
Spot characters:	Display spot characters for this species
Literature:	Burrows, J.E. (1990). Southern African Ferns and Fern Allies. Frandsen, Sandton. Page 76. (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 254 - 255. (Includes a picture). Jacobsen, W.B.G. (1983). The Ferns and Fern Allies of Southern Africa. Butterworths, Durban and Pretoria. Page 485. (Includes a picture). Mapaura, A. & Timberlake, J. (eds) (2004). A checklist of Zimbabwean vascular plants Southern African Botanical Diversity Network Report No. 33 Sabonet, Pretoria and Harare Page 8. Roux, J.P. (2001). Conspectus of Southern African Pteridophyta. Southern African Botanical Diversity Network Report 13 Pages 174 - 175. Roux, J.P. (2009). Synopsis of the Lycopodiophyta and Pteridophyta of Africa, Madagascar and neighbouring islands Page 55. Schelpe, E.A.C.L.E. (1970). Pteridophyta Flora Zambesiaca Pages 65 - 66. Setshogo, M.P. (2005). Preliminary checklist of the plants of Botswana. Sabonet Report no. 37. Sabonet, Pretoria and Gaborone Page 15.

Other sources of information about Marsilea apposita:

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Flora of Botswana: Marsilea apposita

External websites:

African Plants: A Photo Guide (Senckenberg): Marsilea apposita
BHL (Biodiversity Heritage Library): Marsilea apposita
EOL (Encyclopedia of Life): Marsilea apposita
GBIF (Global Biodiversity Information Facility): Marsilea apposita
Google: Web - Images - Scholar
iNaturalist: Marsilea apposita
IPNI (International Plant Names Index): Marsilea apposita
JSTOR Plant Science: Marsilea apposita
Mansfeld World Database of Agricultural and Horticultural Crops: Marsilea apposita
Plants of the World Online: Marsilea apposita
Tropicos: Marsilea apposita
Wikipedia: Marsilea apposita