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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
Hypotrachyna exsecta (Taylor) Hale
  Phytologia 28: 341 (1974); Parmelia exsecta Taylor, London J. Bot. 6: 167 (1847). T: Nepal, N.Wallich; lecto: FH-TAYL, fide M.E.Hale ex J.A.Elix, Fl. Australia 55: 341 (1994).  
  Thallus loosely adnate to adnate, to 5–13 cm wide. Lobes often crowded, sublinear, dichotomously to subirregularly branched, 1–3 mm wide; margins entire. Upper surface whitish grey, flat to slightly convex, shiny, continuous, emaculate, pustulate, without isidia; pustules subapical, erumpent, eroding and becoming coarsely granular-sorediate and exposing black lower cortex. Medulla white. Lower surface moderately rhizinate; rhizines richly dichotomously branched, shiny. Apothecia rare, sessile, 2–7 mm wide. Ascospores 9–11 × 5–8 µm. Pycnidia not seen. CHEMISTRY: cortex K+ yellow, UV-; medulla K-, C-, KC+ orange, P-; containing atranorin, chloroatranorin, barbatic acid (major), 4-O-demethylbarbatic acid (submajor), obtusatic acid (trace) and norobtusatic acid (trace).
  Rare in eastern Qld; also known from Papua New Guinea, SE Asia and East Asia. Grows on bark.  
  Elix (1994h)  

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

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