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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 tetracerae (Ach.) Müll.Arg. var. tetracerae
  Bot. Jahrb. Syst. 6: 401 (1885); Verrucaria tetracerae Ach., Methodus 121 (1803). T: [Sierra Leone], A.Afzelius; holo: H-ACH 838; iso: LD, S, UPS.  
  Thallus epilithic or epiphloeodal, sparingly rimose to areolate, closely appressed to or peeling from the substratum, pale khaki-grey or pale grey-brown, matt to glossy, smooth to irregularly rugulose, (30–) 90 (–150) µm thick, occasionally with a brown-black basal layer, ±ecorticate, occasionally with simple or branched isidioid outgrowths; prothallus black or not apparent. Algae Trentepohlia; cells 6–18 × 6–14 µm. Perithecial verrucae convex to hemispherical, 0.36–0.8 mm diam.; wall containing a layer of colourless crystals; apex plane to convex; ostiole usually inconspicuous; periostiolar area pale to dark brown or blackish, 0.14–0.3 mm diam. Involucrellum apical to dimidiate, pale to medium brown below the apex, 20–40 µm thick. Exciple 20–25 µm thick, pale brown. Centrum 0.2–0.35 mm wide. Asci elongate-cylindrical or narrowly obclavate, 82–122 × 9–13 µm. Ascospores fusiform to ±oblong, 7-septate, 24–44 × 3.5–7 µm; perispore usually not apparent. Pycnidia not seen.
  Grows on bark and siliceous rocks in Christmas Is., northern N.T., eastern Qld and north-eastern N.S.W. Pantropical.  
  McCarthy (2001b)  

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

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