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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 deminuta P.M.McCarthy
  Lichenologist 32: 21 (2000). T: Cook Islands, Rarotonga, Te Kou track, Takuvaine Stream, 21°14'S, 159°46'W, alt. c. 80 m, on deeply shaded, semi-aquatic basalt, 7 June 1998, P.M.McCarthy 1262; holo: WELT.  
  Thallus epilithic, effuse to determinate, medium green, smooth to verruculose, usually dull, (15–) 25–40 (–60) µm thick, continuous to rimose or areolate, somewhat gelatinous when wetted, ecorticate, heavily impregnated with minute rock fragments and crystals, K–. Areolae plane, angular, 0.2–0.4 mm wide. Algae Trentepohlia; cells 6–12 × 6–10 µm. Hyphae c. 2 µm wide. Prothallus not apparent. Basal layer absent. Perithecia semi-immersed to superficial, moderately numerous, convex, hemispherical, subconical or subglobose. Perithecial apex rounded. Ostiole inconspicuous. Involucrellum (0.14–) 0.18 (–0.25) mm diam., glossy black in surface view, dark olive-brown or purple-black in thin section, 20–40 µm thick, K–, contiguous with the excipulum and extending to excipulum-base level, not or scarcely overgrown by the thallus. Centrum globose to depressed-ovate, 0.1–0.15 mm diam. Excipulum uniformly hyaline or slightly darker towards the ostiole, 10–15 µm thick. Subhymenium c. 10 µm thick. Paraphyses unbranched, c. 1 µm wide. Periphyses absent. Asci elongate-cylindrical or obclavate, with a rounded or subtruncate apex and a distinct apical chitinoid ring turning orange-red in Congo Red, 75–90 × 10–16 µm. Ascospores colourless, 7-septate, fusiform, mostly elongate-fusiform, occasionally elongate-cylindrical, straight, slightly curved or faintly sigmoid, with rounded to subacute ends, irregularly biseriate in the asci, (20–) 26 (–30) × (4.5–) 6 (–8) µm; gelatinous sheath 0.5–1 (–2) µm thick; contents clear. Conidiomata: not seen.
  Grows on limestone and 'fibro' in Christmas Is.; also in the Cook Islands.  

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

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