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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
Porina ocellatoides P.M.McCarthy
  Lichenologist 29: 234 (1997). T: Lord Howe Is., track from Smoking Tree Ridge to Boat Harbour, 31°33'23"S, 159°05'33"E, alt. c. 50 m, on deeply shaded basalt, 10 February 1995, P.M.McCarthy 1043; holo: CANB.  
  Thallus epilithic, determinate, pale grey-green to pale sandy brown, 60–100 µm thick, adpressed, sparingly to richly rimose, matt to slightly glossy, minutely uneven, impregnated with rock fragments and crystals, K-, with an 8–15 µm thick uppermost layer that is sometimes ±prosoplectenchymatous. Algae Trentepohlia; cells 6–12 × 6–10 µm. Hyphae 2–3 µm wide. Prothallus thin and blackish or not apparent. Basal layer brownish black, discontinuous, 30–70 µm thick. Perithecia moderately to very numerous, immersed in thallus-dominated verrucae. Verrucae convex to hemispherical, 0.65–1 mm diam. Perithecial apex usually plane to convex, with a broad, black periostiolar area. Ostiole inconspicuous or in a depression to 100 µm diam. Involucrellum apical, 0.2–0.65 mm diam., 40–70 µm thick, externally brown-black to black, internally medium orange-brown. Excipulum pale yellowish brown, slightly darker near the ostiole, c. 20 µm thick. Centrum subglobose to globose, 0.3–0.42 mm diam. Paraphyses unbranched, c. 1 µm thick. Periphyses absent. Asci broadly fusiform to elongate-fusiform, 8-spored, 170–186 × 22–27 µm, with a rounded apex, with or without a subapical constriction; apical chitinoid ring absent (in Congo Red). Ascospores colourless, muriform, with 9–17 transverse septa, each loculus with (0–) 1–2 longitudinal or diagonal septa (in optical section), narrowly ellipsoid, fusiform or elongate-cylindrical, usually straight and with rounded ends, irregularly biseriate in the asci, usually with a 3–7 (–10) µm thick gelatinous sheath, (35–) 42 (–54) × (9–) 11 (–14) µm; contents clear to minutely granulose. Conidiomata immersed in 0.1–0.16 mm diam. thalline verrucae, with brown-black apices and hyaline bases. Conidia elongate-ellipsoid to fusiform, 2–4 × 1 µm.
  Known from shaded basalt at three localities on Lord Howe Is.; endemic.  
  McCarthy (1997a)  

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

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