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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 howeana P.M.McCarthy
  Lichenologist 29: 229 (1997). T: Lord Howe Is., Max Nicholls Track, E of Dawsons Point Ridge, 31°31'09"S, 159°03'05"E, alt. c. 80 m, on shaded basalt, 6 Feb. 1995, P.M.McCarthy 1150; holo: CANB.  
  Thallus epilithic, determinate, mid- to dark olivaceous brown, occasionally paler, smooth to minutely rugulose, usually glossy, 20–30 (–50) µm thick, sparingly to richly, but finely, rimose, not areolate, gelatinous and translucent when wetted, ecorticate, containing few or no rock fragments and crystals, K-. Algae Trentepohlia; cells 6–12 × 6–10 µm. Hyphae c. 2 µm wide. Prothallus not apparent. Basal layer absent. Perithecia semi-immersed to superficial, very numerous. Perithecial apex rounded. Ostiole inconspicuous. Involucrellum dark olive-brown to blackish in surface view, dark orange-brown to dark olive-brown in thin section, K-, hemispherical, (0.19–) 0.25 (–0.33) mm diam., 20–35 (–45) µm thick, extending to excipulum-base level, covered by a thin layer of thallus and interspersed. Centrum globose to depressed-ovate, 0.1–0.17 mm diam. Excipulum uniformly pale yellow-brown, 15–20 µm thick. Paraphyses unbranched, 0.8–1 µm wide. Periphyses absent. Asci elongate-cylindrical, with rounded or subtruncate apex and a distinct apical chitinoid ring (in Congo Red), 70–86 × 11–14 µm. Ascospores colourless, 7-septate, fusiform to elongate-fusiform, less commonly elongate-cylindrical, straight, slightly curved or faintly sigmoid, with rounded to subacute ends and a (2–) 4 (–6) µm thick gelatinous sheath, irregularly biseriate in the asci, (19–) 25 (–31) × (4–) 5 (–6.5) µm; contents clear. Conidiomata moderately numerous, semi-immersed to almost superficial, dark brown to blackish above, pale brown below, 80–120 µm diam., with a convoluted conidiogenous layer. Conidia narrowly ellipsoid to bacilliform, 3–4 × 1–2 µm.
  Common on moderately to deeply shaded basalt in lowland forest 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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