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Australian Biological Resources Study

Checklist of the Lichens of Australia and its Island Territories
Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References
Strigula oceanica P.M.McCarthy, Streimann & Elix
  Lichenologist 28: 242 (1996). T: Lord Howe Is., Stevens Reserve, 31°31'33"S, 159°03'43"E, alt. c. 5 m, on leaves of understorey Dysoxylum pachyphyllum, 11 Feb. 1995, P.M.McCarthy 1039 & J.A.Elix; holo: CANB.  
  Thallus crustose, foliicolous, subcuticular, determinate, continuous, with shallow, rounded lobes separated by shallow, radiating grooves, or with concentric grooves, pale grey-green to pale green, usually slightly glossy, up to 8 mm wide, 30–60 µm thick, ecorticate; margin concolorous. Algae Cephaleuros; cells rectangular to irregularly oblong, 10–20 × 6–10 µm. Prothallus a thin black line between contiguous thalli. Perithecia very numerous, 2/3 to almost entirely immersed, usually solitary. Involucrellum apical to dimidiate, convex, jet black, glossy, sometimes with a purple tone, 0.32–0.57 (–0.9) mm diam., 25–50 µm thick; surface frequently minutely rugulose; transition with thallus usually abrupt. Ostiole inconspicuous or in a shallow, c. 80 µm diam. depression. Excipulum hyaline at the base and lower sides, medium to dark brown towards the apex, 10–15 µm thick. Centrum depressed-globose, 0.28–0.5 (–0.75) mm diam. Subhymenium 10–15 µm thick. Paraphyses simple to sparingly branched, 1–2 (–2.5) µm thick. Periphyses absent. Asci fissitunicate, elongate-cylindrical, 92–110 × 6–8 µm; lateral walls c. 1 µm thick; apex rounded or subtruncate, 1–3 µm thick, with a 1–2 µm broad and 1–2 µm tall, hemispherical or tubercular ocular chamber; lateral walls and apex IKI-; ascoplasma IKI+red-brown. Ascospores 8 per ascus, hyaline, elongate-ellipsoid to elongate-fusiform, 1-septate, 13–16 × 3.8–5 µm; spore halves separate at the septum early in their ontogeny, 16 per ascus, uniseriate, irregularly massed, 6–8.5 × 3.8–5 µm; contents usually 1–3-guttulate. Conidiomata of two types: (1) 40–80 µm diam., immersed, glossy black above, pale to dark brown below, with a simple conidiogenous layer and fusiform to bacilliform microconidia of 2–3 × 0.5 µm; (2) 90–170 µm diam., immersed, glossy black above, colourless below, producing macroconidia. Macroconidia 1-septate, elongate-ellipsoid to cylindrical, 8–9.5 × 2–3 µm; cells (1–) 2 (–3)-guttulate; apices with thread-like, 8–12 (–15) µm long gelatinous appendages.
  Abundant on the leaves of moderately shaded understorey shrubs at the type locality near the north end of Lord Howe Is.; also in New Zealand.  
  McCarthy et al. (1996)  

Checklist Index
Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References

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