Plagiochasma beccarianum Stephani
  • Ann. Sci. Nat., Bot., ser. 7,


Cite taxon page as 'WFO (2020): Plagiochasma beccarianum Stephani. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0001201936. Accessed on: 03 Jul 2020'

Morphology

Thalli medium-sized to rather large, in gregarious patches; bright green and shiny, finely and irregularly areolate, air pores distinctly visible, margins narrowly purple, sparsely scalloped and slightly undulate; when dry, margins tightly inflexed. Branches once or twice pseudodichotomously furcate, sometimes articulate with apical innovations, ligulate to Ungulate, 8-20 mm long, 3.5-5.0(-6.0) mm wide, 600-850 µm thick medianly, in section 6-8 times wider than thick, apex notched with several purple, ovate-lanceolate scale appendages recurved over edge; groove absent, thallus dorsally flat, margins acute, thin; flanks sloping obliquely; ventral face medianly keeled, green. Scales in 2 ventral rows, asymmetric, obliquely triangular, deep purple to violet, body ± 850 µm long, margins sometimes with a few prominent, 1-3-celled teeth, base flatly arched, ± 1750 µm wide, gradually tapered above into 2 or 3 lanceolate appendages, up to 1000 µm long, not constricted at base, ± 400 µm wide, margins also occasionally toothed, ± 10 small oil cells scattered throughout scale. Dorsal epidermal cells unistratose, hyaline, polygonal, 25.0-37.5 x 20.0-27.5 µm, walls thin, at corners with trigones; air pores slightly raised, simple, 15-30 µm wide, surrounded by innermost ring of small, collapsed cells, then by 2 (or 3 partly) concentric rings of 6-8 larger cells in each, radial walls not thickened. Assimilation tissue 300-400 µm thick, air chambers empty, in several storeys, bounding walls chlorophyllose; storage tissue occupying ventral part of thallus; oil cells scattered throughout tissues. Monoicous, but receptacles often on separate plants. Androecia medianly and generally just proximal to apical innovation, sessile cushions, kidney-shaped or rounded, basally surrounded by purple paleae, 300-400 x 160-200 µm, apically pointed or blunt, margins sometimes with projecting papillae. Gynoecial receptacles medianly near apex of main branch or on apical innovation, single, sometimes 2 in acropetal sequence, basally surrounded by dark paleae with pointed apex, up to 500 x 80 µm, sometimes a few papillae at margins; carpocephala up to 3.5 x 3.5 mm, when 4 lobes present. Stalk 1.2-3.5 mm long, ± 825 µm wide. Involucre bilabiate. Spores 80-90 µm diam., triangular-globular, polar, light brown; wing 10 µm wide, porate at corners, margin finely crenulate; ornamentation similar on 2 faces; distal face with 3 or 4 alveoli across, 20-25 µm wide, walls ± 7.5 µm wide and finely granular; proximal face with distinct triradiate mark, ridge ± 7.5 µm high, each of 3 facets with 4 alveoli, walls wide and sprinkled with granules. Elaters light brown, 195-258 µm long, 12.5 µm wide in middle, tapering toward ends, 7.5 µm wide, occasionally branched, bispiral except at tips.

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

    Habitat

    Shady kloof under boulders or in a rocky crevice.

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

    Distribution

    Northern Province and Mpumalanga.

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

      Bibliography

    • 1 Ann. Sci. Nat., Bot., ser. 7,
    • 2 Perold, SM. 1999. Hepatophyta. Fl. S. Africa (1,1): 1 - 252.

     Information From

    Aytoniaceae
    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).