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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 decrescens P.M.McCarthy & Kantvilas
  Lichenologist 25: 140 (1993). T: Anthony Road, Tas., 41°50'S, 145°38'E, 10 May 1991, G.Kantvilas 258/91; holo: HO.  
  Thallus epiphloeodal, diffuse to continuous, pale to medium grey-green, matt, smooth to minutely uneven, 20–40 µm thick, ecorticate; prothallus not apparent. Algae Trentepohlia; cells 7–16 × 6–13 µm. Perithecia one-third immersed and hemispherical to superficial and subglobose, 0.17–0.3 mm diam., dull orange-brown to red-brown; apex rounded; ostiole inconspicuous or in a 20–30 µm wide papilla. Involucrellum contiguous with the exciple, sometimes incurved beneath, 23–40 µm thick, containing algae, K–. Exciple 10–15 µm thick, hyaline to pale yellow-brown. Centrum 0.13–0.19 mm wide. Asci elongate-cylindrical or narrowly obclavate, 70–85 × 7–8.5 µm. Ascospores elongate-fusiform to subacicular, usually tapering towards the proximal end, (3–) 5–7 (–9)-septate, 23–46 × 2.5–3.5 µm; perispore not apparent. Pycnidia not seen.
  Occurs in southern Vic. and Tas.; grows on smooth-barked twigs in cool-temperate rainforest. Also in New Zealand.  
  McCarthy (2001b)  

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

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