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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 exocha (Nyl.) P.M.McCarthy
  Lichenologist 32: 23 (2000); Verrucaria exocha Nyl., Flora 52: 125 (1869); Clathroporina exocha (Nyl.) Müll.Arg., Bull. Herb. Boissier 2, App. 1: 93 (1894). T: New Zealand, 1867, C.Knight; holo: H-NYL 1591.  
  Thallus epiphloeodal, pale yellowish green to grey-green or pale buff-brown, (60–) 100–200 (–250) µm thick, continuous to rimose, smooth, minutely rugulose, verruculose or coarsely verrucose, corticate; prothallus pale grey, dark grey-brown or not apparent. Algae Trentepohlia; cells 6–14 × 6–11 µm. Perithecial verrucae convex, hemispherical or subglobose, 0.7–1.5 mm diam., often strikingly visible as buff-brown to dark olive-brown, hemispherical to attenuated-subglobose swellings on the underside of raised thalli; wall containing a layer of colourless crystals; apex slightly concave, plane or rounded; ostiole inconspicuous; periostiolar area concolorous with the thallus or pinkish brown to medium brown. Involucrellum pale yellowish brown to orange-brown, forming a ±globose shell that often encloses the exciple. Exciple 20–30 µm thick, hyaline to pale brown. Centrum 0.55–1 mm wide. Periphyses 25–50 (–60) long. Asci broadly fusiform to oblong, 290–440 × 38–75 µm. Ascospores narrowly to broadly ellipsoidal or fusiform, muriform, with 19–34 transverse septa, each loculus with 2–4 (–6) longitudinal/ diagonal septa, 68–168 × 20–45 µm; perispore at first 3–5 (–7) µm thick, finally disappearing except for persistent apical caps. Pycnidia immersed in 80–150 µm diam. verrucae. Conidia fusiform, 2–4 × c. 1 µm.
  Known from one locality in montane rainforest in north-eastern Qld. Also in northern New Zealand (where it is very common), Norfolk Is. and the Cook Islands.  
  McCarthy (2001b)  

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

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