Asterella muscicola (Stephani) S.W. Arnell
  • Hepat. S. Africa


Cite taxon page as 'WFO (2020): Asterella muscicola (Stephani) S.W. Arnell. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0001198995. Accessed on: 30 Mar 2020'

Diagnostic Description

It differs from Athalamia species mainly in sporophyte characters: the stalk arises at the bifurcation of the branches, it is thicker and has a rhizoid furrow, it is also devoid of scales both at the base and summit; the cells, in the capsule wall lack annular or semi-annular thickenings; pseudoperianths are present; the spores are larger, dark brown and winged, their ornamentation is reticulate (not papillose); the elaters are shorter and wider.

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

    Morphology

    Thalli medium-sized to fairly large, in crowded patches; bright green, areolate, somewhat spongy, air pores tiny, white specks, very slightly raised, margins soon turning purple, becoming wider proximally and pinkish purple, scalloped and undulate, in older parts dead; when dry, thallus margins tightly clasped together. Branches simple or once/twice pseudodichotomously furcate, oblong, up to 18 mm long, 2.5-3.5(-6.5) mm wide, ± 1250 µm thick medianly, in section 2-5 times wider than thick, apex notched, tips of ventral scales recurved over edge; groove faintly present toward apex, slightly raised, simple, ± 7.5 µm wide, surrounded by innermost ring of small collapsed cells, then by 2 concentric rings of 6 larger cells in each, radial walls mostly thickened and pores stellate. Assimilaton tissue ± 650 µm thick, air chambers tall and empty, mostly in one storey, bounded by chlorophyllose, unistratose walls; storage tissue with cells tightly packed together; oil cells scattered throughout tissues. Paroicous. Androecia with antheridia grouped or in 1 or 2 short rows along midline of thallus, generally immediately proximal to stalk, very rarely on separate plant, immersed, opening above into prominent, conical papillae. Gynoecial receptacles single, rarely paired at apices of 2 furcate branches, almost sessile when young, later raised on stalk; carpocephalum rounded to somewhat µmbonate, ± 3 mm across, air pores compound, below with 3-5 capsules (sometimes 2 together in same involucre). Stalk arising at bifurcation of branches, the latter continuing in growth, yellowish, shiny, ribbed, stout, erect or somewhat bent, 5-8 mm long, ± 675 µm wide at midlength, becoming thicker toward base and tapering toward naked summit, with one rhizoid furrow and narrow to wide air chambers. Involucre ± bilabiate, enclosing base of pseudoperianth and capsule. Pseudoperianths extending obliquely downward, projecting ± 300 µm beyond involucre, somewhat flattened sideways, with 12 or 13 cage-like, hyaline segments, connate at tips. Sporophyte with swollen foot and very short seta, capsule globose, ± 875 µm diam., wall unistratose, lacking thickening bands. Spores 75-95 µm diam., triangular-globular, dark brown, opaque; wing somewhat pleated, 5 µm wide, margin undulate; distal face convex, reticulate, with very irregular, mostly incomplete alveoli, ridges forming an irregular, zigzagging maze; proximal face with distinct triradiate mark, facets also with irregular, incomplete alveoli, ranging from small and crowded to larger and more widely dispersed. Elaters 150-175 µm long, 17.5 µm wide in centre, slightly tapering toward ends, bispiral, light brown.

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

    Habitat

    High altitudes on soil overlying sandstone or basalt outcrops.

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

    Distribution

    Botswana, Northern Province, North-West, Mpumalanga, Free State, KwaZulu-Natal, Lesotho, and Eastern Cape.

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

      Bibliography

    • 1 Hepat. S. Africa
    • 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).