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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 natalis P.M.McCarthy
  Biblioth. Lichenol. 78: 281 (2001). T: Christmas Is., 1 km S of North-East Point, The Grotto, 10°25.38'S, 105°42.10'E, alt. c. 20 m, on deeply shaded, heavily weathered limestone in moderately dense primary forest, 23.vii.2000, P.M.McCarthy 1566; holo: CANB.  
  Thallus crustose, endolithic to subepilithic, to 20 µm thick, diffuse, continuous, pale grey-green. Algae Trentepohlia; cells 6–14 × 6–11 µm; interstitial hyphae 2–4 µm wide. Prothallus not apparent. Perithecia numerous, usually solitary, mostly semi-immersed to superficial, strongly convex, hemispherical to subglobose and slightly constricted at the base, dull to slightly glossy black, (0.15–) 0.19 (–0.22) mm diam.; surface smooth; decayed perithecia often leaving a shallow depression in the substratum. Perithecial apex rounded or somewhat pointed; ostiole usually in a minute, shallow depression. Involucrellum extending to excipulum-base level or incurved below (in subglobose perithecia), contiguous with the excipulum, 30–40 µm thick. Excipulum pale to dark greenish brown, 10–15 µm thick. Centrum depressed-ovate, 0.1–0.16 mm wide. Subhymenium 10–15 µm thick. Paraphyses sparingly branched, to 1 µm thick. Periphyses absent. Asci broadly cylindrical to elongate-cylindrical, 40–56 × 6–9 µm; apex rounded, non-amyloid, with a 1 µm wide and tall, tuberculate ocular chamber. Ascospores 8 per ascus, hyaline, narrowly ellipsoid, fusiform to narrowly clavate, 1-septate, uniseriate and obliquely overlapping to subbiseriate, (7.5–) 10 (–12) × (2.5–) 3.5 (–4.5) µm; contents usually clear. Conidiomata not seen.
  This very inconspicuous lichen is known only from deeply shaded limestone at the type locality on the north-eastern coastal terrace of Christmas Is.  
  McCarthy (2001i)  

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

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