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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 rupestris P.M.McCarthy
  Lichenologist 29: 518 (1997). T: Lord Howe Is., Max Nicholls Track, E of Dawsons Point Ridge, 31°31'09"S, 159°03'05"E, c. 80 m, on shaded basalt, 6 Feb. 1995, P.M.McCarthy 1048; holo: CANB.  
  Thallus crustose, epilithic, determinate, continuous to sparingly or richly rimose (mainly around perithecia), pale greenish grey, greener in shade and when wetted, impregated with rock fragments and crystals, smooth to minutely and irregularly uneven, matt to slightly glossy, (30–) 50–80 (–100) µm thick, thinly corticate. Cortex ±prosoplectenchymatous or rather amorphous, 10–20 µm thick. Algae Trentepohlia-like; cells broadly ellipsoidal to globose, 5–14 × 5–10 µm; interstitial cells 2–4 µm thick. Prothallus somewhat paler than older parts of the thallus or not apparent. Perithecia very numerous, solitary, 1/3–2/3 immersed, scarcely overgrown by the thallus. Apex hemispherical, convex to somewhat flattened. Ostiole apical, inconspicuous or, usually, pale grey, 30–50 µm diam. and in a shallow to deep 50–120 µm wide depression. Involucrellum extending to excipulum base level, contiguous with the excipulum or arching away from it, smooth or uneven, with embedded rock fragments and crystals often visible, dull black, dark greenish black in thin section, paler near the ostiole, (0.29–) 0.43 (–0.62) mm diam., 50–100 µm thick near the apex, 60–120 µm thick at the base. Excipulum uniformly hyaline or darkening towards the apex, 12–20 µm thick. Centrum depressed-ovate, 0.2–0.35 mm diam. Subhymenium 30–60 µm deep. Paraphyses persistent, simple to sparingly or, occasionally, richly branched, 1–2 µm thick. Periphyses absent. Asci fissitunicate, 8-spored, narrowly to broadly cylindrical, 68–95 × 11–17 µm; contents IKI+ red-brown; walls IKI-; lateral walls c. 1 µm thick at maturity; apical dome 3–4 µm thick; ocular chamber hemispherical to tubercular or conical, 1–2 µm broad and tall. Ascospores colourless, fusiform to elongate-cylindrical, straight or irregularly curved, submuriform, with (5–) 7 (–9) transverse septa, usually 3–4 cells with a single longitudinal or diagonal septum, often tapering towards the proximal end and markedly constricted at the primary septum, uniformly thin-walled, irregularly biseriate in the ascus, (16–) 22.5 (–30) × (5.5–) 7 (–8.5) µm; contents clear to finely granular. Conidiomata of two types: (1) 60–90 µm diam., dark brown to black above, colourless below, with a simple conidiogenous layer and bacilliform microconidia of 2–5 × 0.5 µm; (2) 80–170 µm diam., plane to slightly convex, dark brown to black above, with a paler ostiole, colourless below, with narrowly cylindrical macroconidia of (11–) 15.5 (–20) × (3–) 3.5 (–4.5) µm, mostly with hemispherical, subglobose or more elongate (2–6 µm), gelatinous apical appendages.
  Abundant on shaded basalt outcrops and boulders in the lowlands of Lord Howe Is.; endemic.  
  McCarthy (1997b)  

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

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