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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 guentheri (Flotow) Zahlbr.
  Cat. Lich. Univ. 1: 384 (1922); Verrucaria guentheri Flotow, Bot. Zeitung (Berlin) 8: 575 (1850). T: Riesengebirge, [Czech Republic], 4 Sept. 1846, coll. unknown; syn: UPS.  
  Thallus epilithic, continuous to areolate, pale to medium grey-brown or dark olive-green, matt, smooth to minutely rugulose, 30–100 µm thick, ecorticate; prothallus not apparent. Algae Trentepohlia; cells 7–18 × 7–14 µm. Perithecia almost superficial, hemispherical to subglobose, 0.23–0.48 mm diam., black; apex rounded; ostiole inconspicuous or in a 40–50 µm wide papilla. Involucrellum greenish black or purple-black in thin section, contiguous with the exciple, sometimes incurved beneath, 40–110 µm thick, not containing algae, K+ reddish brown. Exciple 15–25 µm thick, hyaline to purple-black. Centrum 0.18–0.31 mm wide. Asci elongate-cylindrical to narrowly obclavate, 80–130 × 10–14 µm. Ascospores fusiform to elongate-fusiform, (3–) 5–7 (–9)-septate, 22–49 × 3.5–6.5 µm, without a distinct perispore. Pycnidia semi-immersed to superficial, 60–150 µm diam., black. Conidia fusiform to bacilliform, 2–4 × 0.5–1.2 µm.
  Occurs in south-western W.A. and Tas.; grows on moderately to deeply shaded siliceous rocks. A ±cosmopolitan species, especially common in temperate regions (including southern South Africa and New Zealand); occasional in the eastern Palaeotropics.  
  McCarthy (2001b)  

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

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