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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 mariae P.M.McCarthy
  Lichenologist 29: 232 (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 Feb. 1995, P.M.McCarthy 1044; holo: CANB.  
  Thallus epilithic, determinate, pale grey-green, sparingly to richly and finely rimose to areolate, matt to slightly glossy, smooth to minutely uneven, 50–100 (–200) µm thick, ecorticate, K-. Areolae plane, angular, irregular, 0.5–1.6 mm wide. Algae Trentepohlia; cells 8–20 × 7–16 µm. Hyphae 2–4 µm wide. Prothallus not apparent. Basal layer absent. Perithecia numerous, semi-immersed to superficial, dark grey to black, convex to hemispherical, often partly to almost completely overgrown by a 20–60 µm thick thalline layer. Perithecial apex rounded; ostiole inconspicuous or in a 60–120 µm diam. depression, occasionally pale to medium brown. Involucrellum green-black to purple-black in thin section, colour intensifying in K, arching away from the excipulum or contiguous with it except at the base, occasionally enclosing it, (0.48–) 0.67 (–0.97) mm diam., 80–150 (–200) µm thick. Centrum subglobose to depressed-ovate, 0.29–0.46 mm diam. Excipulum medium greenish-brown to diffuse purple-black at the base, darkening towards the apex, 18–25 µm thick. Subhymenium 30–60 µm thick. Paraphyses unbranched, 0.7–1 µm wide. Periphyses absent. Asci elongate-cylindrical, 140–190 × 13–18 µm, with a subtruncate to truncate apex and a distinct apical chitinoid ring (in Congo Red). Ascospores colourless, 7 (–9)-septate, fusiform to fusiform-cylindrical, straight to faintly sigmoid, with acute to subacute apices and a 2–4 µm thick gelatinous sheath, irregularly biseriate in the asci, (27–) 36.5 (–45) × (5–) 6.5 (–8) µm; contents clear. Conidiomata numerous, semi-immersed to almost completely immersed, black above, pale brown below, 0.1–0.21 mm diam., with a convoluted conidiogenous layer. Conidia narrowly fusiform, 3–4 × 0.7 µm.
  Occurs on deeply shaded basalt at several lowland forest sites of Lord Howe Is.; endemic.  
  McCarthy (1997a)  

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

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