Isoetes transvaalensis Jermy & Schelpe


Cite taxon page as 'WFO (2020): Isoetes transvaalensis Jermy & Schelpe. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0001110727. Accessed on: 09 Jul 2020'

Morphology

Megaspores almost smooth. Rhizomorph 3-lobed, less than 10 mm in diameter. Sporangium with a complete velum.

  • Provided by: [A].e-Flora of South Africa
    • Source: [
    • 1
    • ]. 

    Pseudo-corm 3-lobed, < 10 mm in diameter. Leaves erect, terete to semi-terete, tapered to acute apex, 30-160 mm long, base broadly deltate, ± 3 mm wide, ligule somewhat fan-shaped. Sporangium completely covered by velum. Megaspores blackish when wet, smooth to shallowly tuberculate.

  • Provided by: [A].e-Flora of South Africa
    • Source: [
    • 2
    • ]. 

    Rhizomorph trilobed, less than 10 mm in diameter; rhizomorph-scales broadly deltate, becoming trilobed and cuspidate, black-brown, nitid, with scarious margins. Sporophylls c. 30-160 x 1-2 mm (when dry), tapered gradually to an acute apex, base broadly deltate with scarious margins 1 mm broad extending up to 20 mm along lamina; ligule flabellate, broader than long, labium shorter than ligule. Sporangium with complete velum, oblong-ovate, up to 4 x 2.5 mm. Megaspores coal-black when moist, greyish when dry, almost smooth on distal and proximal faces, 390-500 µm. Microspores faintly granular, 28-32 µm.

  • Provided by: [A].e-Flora of South Africa
    • Source: [
    • 3
    • ]. 

    Habitat

    In rock pools in sandstone, submerged during summer, dry during winter.

  • Provided by: [A].e-Flora of South Africa
    • Source: [
    • 1
    • ]. 

    Mesic Grassland. In rock pools on sandstone in montane grassland or mountain peaks, submerged during summer, dry during winter.

  • Provided by: [A].e-Flora of South Africa
    • Source: [
    • 2
    • ]. 

    Rock pools in sandstone; submerged during summer, dry during winter.

  • Provided by: [A].e-Flora of South Africa
    • Source: [
    • 3
    • ]. 

    Distribution

    Natal, Lesotho, Orange Free State and Transvaal.

  • Provided by: [A].e-Flora of South Africa
    • Source: [
    • 3
    • ]. 

      Bibliography

    • 1 Herman, PPJ; Retief, E. 1997. Plants of thenorthern provinces of South Africa: keys and diagnostic characters. Strelitzia 6: 1 - 681. National Botanical Institute, Pretoria.
    • 2 Klopper, RR. 2017. Lycopodiophyta. In: E Retief & NL Meyer (eds), Plants of the Free State: Inventory and identification guide. 38: 109 - 113. South African National Biodiversity Institute, Pretoria.
    • 3 Schelpe, EACLE; Anthony, NC. 1986. Pteridophyta. In: O.A. Leistner (ed.). Fl. S. Africa : 1 - 278.

     Information From

    e-Flora of South Africa
    e-Flora of South Africa. v1.21. 2018. South African National Biodiversity Institute. http://ipt.sanbi.org.za/iptsanbi/resource?r=flora_descriptions&v=1.21
    • A All Rights Reserved
    International Union for Conservation of Nature
    https://www.iucn.org/
    IUCN 2016. IUCN Red List of Threatened Species. Version 2016-2
    • B All Rights Reserved
    International Union for Conservation of Nature v.3
    https://www.iucnredlist.org/
    IUCN 2019. The IUCN Red List of Threatened Species. Version 2019-1.
    • C See IUCN Terms and conditions of use http://www.iucnredlist.org/info/terms-of-use
    Isoetaceae
    World Flora Online Data. 2017.
    • D CC0 1.0 Universal (CC0 1.0).
    World Flora Online consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2018.
    • E CC0 1.0 Universal (CC0 1.0).