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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 sphaerocephala Vain.
  Ann. Acad. Sci. Fenn., ser. A, 15(6): 368 (1921). T: Philippines, Robinson; holo: TUR-VAINIO n.v.  
  Thallus epiphyllous, composed of minute ±round patches, pale greyish green or pale green, usually matt, with branched ±radiating ridges; ridges ±plane, to 0.15 mm wide, pale grey to pale green; prothallus not apparent. Algae Phycopeltis; cells rectangular, forming radiating plates. Perithecia superficial, ±subglobose, 0.15–0.28 mm diam., pale yellowish to pale orange-brown; surface rough, sometimes verruculose (due to clusters of crystals embedded in the involucrellum); apex usually plane to slightly convex; ostiole inconspicuous. Involucrellum contiguous with the exciple, partly overgrown by the thallus, K+ reddish brown. Exciple c. 10–15 µm thick, hyaline to pale yellowish brown. Asci narrowly obclavate, 50–60 × 8–12 µm. Ascospores ±elongate-bacilliform, 7-septate, 27–40 × 3–4.5 µm; perispore not apparent. Pycnidia not seen.
  Occurs in north-eastern Qld; grows on leaves of shrubs and trees in rainforest. Also in West and East Africa, Sri Lanka, E and SE Asia and Malesia.  
  McCarthy (2001b)  

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

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