Asplenium sandersonii Hook.
  • Sp. Fil.


Cite taxon page as 'WFO (2020): Asplenium sandersonii Hook. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0001108035. Accessed on: 27 May 2020'

Morphology

Rhizome erect, ± 3 mm in diameter, set with brown rhizome scales. Fronds gemmiferous on rhachis. Proliferating bud borne at end of an extension of rhachis. Pinnae in up to 32 pairs, rhombic-dimidiate to cuneate tending to lunate, outer margin shallowly lobed into usually 4-6(-9) entire, obtuse lobes.

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

    Plants epilithic or epiphytic. Rhizome erect to suberect, to 15 mm long, to 2 mm in diameter, set with roots, crowded persistent stipe bases and scales, scales chartaceous, castaneous to ferrugineous, clathrate, sessile, lanceolate, cordate-imbricate, margins basally with a few scattered filiform outgrowths terminating in an enlarged obovate gland-like cell, entire towards the apex, apex terminates in an oblong thin-walled cell, to 5 mm long, to 1.2 mm wide. Fronds crowded, to 9 per plant, caespitose, arching, to 300 mm long; stipe firm, green, basally sulcate, centrally raised apically, to 80 mm long, to 1 mm in diameter, sparsely scaled, scales chartaceous, castaneous to ferrugineous, clathrate, sessile, lanceolate to subulate, cordate to cordate-imbricate, with scattered filiform outgrowths terminating in an enlarged obovate gland-like cell along the margin, apex terminates in an oblong thin-walled cell, to 3 mm long, to 0.3 mm wide; lamina anadromous, 1-pinnate, linear-cuneate, to 230 mm long, to 27 mm wide, with up to 24 pinna pairs, proliferous, bud borne at the apex of a rachis extension; rachis green, firm, sulcate, centrally ridged, sparsely scaled, scales similar to, but smaller than, those on the stipe; pinnae petiolate, petiole to 1.5 mm long, opposite to alternate, basally widely spaced, pinnae in the lower third of the lamina gradually reduced, coriaceous, rhombic-dimidiate to cuneate, lobed, in the larger pinnae the proximal acroscopic lobe shallowly 2- to 3-lobed, to 13 mm long, to 9 mm wide, glabrous adaxially and abaxially; costa adaxially slightly raised. Venation anadromous, adaxially obscure, evident abaxially, ending in the teeth near the margin. Sori linear, lunate, medial on the simple vein branches, to 3 mm long; indusium membranous, semicircular, lacerate, to 3 mm long, to 1.5 mm wide; sporangium long-stalked, uniseriate, 3-seriate below capsule, capsule broadly elliptic in lateral view, with (18-)19(-19) indurated annulus cells, epistomium 2-celled, hypostomium 4-celled. Spores 64 per sporangium, brown, elliptic, monolete, echinate, fenestrate, (38-)41.27(-44) x (26-)28.17(-30) µm.

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

    Habitat

    Epiphytic or lithophytic in forest.

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

    Epilithic or epiphytic, on moist rocks in streambeds or as low-level epiphytes, in deep shade in moist evergreen forests. Not edaphically bound.

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

    Gregarious low-level epiphyte in moist forest, and occasionally found as a lithophyte on mossy boulders or on forest floors, 350-3300 m.

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

    Distribution

    The species is widespread in sub-Saharan Africa and the western Indian Ocean region.

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

    Transkei, Natal, Transvaal, Zimbabwe, Mozambique, Malawi, Angola, Zaire, Tanzania, Kenya, Uganda, Sudan, Ethiopia, Madagascar, Mauritius, Comoro Islands and São Tomé.

  • Provided by: [B].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 Roux, JP. 2003. Swaziland ferns and fern allies.
    • 3 Schelpe, EACLE; Anthony, NC. 1986. Pteridophyta. In: O.A. Leistner (ed.). Fl. S. Africa : 1 - 278.
    • 4 Sp. Fil.

     Information From

    Aspleniaceae
    World Flora Online Data. 2017.
    • A CC0 1.0 Universal (CC0 1.0).
    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
    • B All Rights Reserved
    World Flora Online consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2018.
    • C CC0 1.0 Universal (CC0 1.0).