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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 aff. thaxteri R.Sant.
  Symb. Bot. Upsal. 12(1): 218 (1952). T: [Dade Co., Florida] U.S.A., R.Thaxter 421; holo: UPS n.v.; iso: MICH n.v.  
  Thallus epiphyllous, rather inconspicuous, small and rounded or forming confluent colonies, continuous, very thin, medium grey-green to medium green, smooth, matt; prothallus not apparent. Algae Phycopeltis; cells rectangular, forming radiating plates. Perithecia superficial, subglobose to globose, strongly attenuated at the base, 0.11–0.17 mm diam., black, smooth, usually matt, initially enclosed by a thin layer of thallus, at maturity at least the uppermost one-third exposed; apex rounded; ostiole inconspicuous or in a shallow depression. Involucrellum extending almost to exciple base level, uniformly c. 15 µm thick, greyish black to violet-black in thin section. Exciple c. 10 µm thick, pale to medium grey-brown. Asci narrowly clavate or obclavate, c. 60 × 10 µm. Ascospores fusiform to oblong, 3-septate, 18–24 × 3–4 µm; perispore to 1 µm thick or not apparent. Pycnidia not seen.
  Occurs in north-eastern Qld; grows on the leaves of a semi-shaded shrub in lowland rainforest. Porina thaxteri, known with certainty only from the Neotropics, usually has larger perithecia (0.2–0.3 mm diam.) with a thicker and persistent covering of thallus.  
  McCarthy (2001b)  

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

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