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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
Physma byrsaeum (Ach.) Tuck.
  Syn. N. Amer. Lich. 1: 115 (1882)
Parmelia byrsaea Ach., Methodus 222 (1803). T: E Sierra Leona, Africa, Afzelius [A.]; n.v.
  Thallus foliose, ±rosulate, adnate, 3–10 cm wide, 300–500 µm thick. Lobes ±radiating, oblong to linear-oblong, occasionally obovate 1.5–10 mm wide; margins entire, thickened, ±recurved. Upper surface ridged, wrinkled or smooth in parts, leaden grey, pale grey, olive green, becoming brown to black with age, sometimes spotted, without isidia. Lower surface dull or pale brown, ±rhizinate; cortex sometimes absent; rhizines of interwoven hyphae forming an indumentum, ±fasciculate, rarely branched, black. Ascomata apothecial,usually present, ±abundant, usually laminal, sessile, 1.5–4 mm wide; disc concave to plane or slightly convex, pale orange to reddish brown; thalline exciple thick, ±wrinkled, sometimes plicate, ±lobed, concolorous with thallus. Ascospores simple, ellipsoidal to broadly ellipsoidal, 13–20 × 10–13 µm; episporium ±irregular, 2–5 µm thick. Pycnidia laminal. Conidia 3–4 µm long; apices not swollen.
  Occurs in north-eastern Qld from the Cooktown area to Finch Hatton and disjunctly in south-eastern Qld and north-eastern N.S.W. Also on Christmas Is. and Norfolk Is. Grows on bark. Also in W Africa, tropical America, N Asia, SE Asia, Oceania.  
  Verdon (1992c)  

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

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