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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
Pseudocyphellaria semilanata (Müll.Arg.) D.J.Galloway
  Lichenologist 17: 306 (1985); Stictina semilanata Müll.Arg., Bot. Jahrb. Syst. 23: 293 (1897). T: Samoa, s. loc., Dr Reinecke; holo: G 002164.  
  Thallus irregularly spreading, loosely attached centrally, 8–12 (–15) cm wide. Lobes dichotomously branching, discrete from margins to centre or complex-imbricate centrally, 1–4 (–6) cm long, 4–10 mm wide, plane to ±canaliculate, rigid, rather coriaceous when dry, pliable when wet; apices divergent, furcate, ±ascending; lobe margins entire, ridged above and below, with tomentum from lower surface often projecting at right angles. Upper surface pale olivaceous to brownish when dry, dull slate-blue to glaucous green, suffused reddish brown when wet, undulate, shallowly ridged to distinctly punctate-impressed; without isidia, phyllidia or soredia. Maculae minute, white, imparting a delicate marbling to upper surface (×10 lens), prominent and ±reticulate at apices. Pseudocyphellae white, scattered, punctiform, 0.1–0.2 mm diam. Medulla white. Photobiont Nostoc. Lower surface yellowish white or pale buff at margins, darkening to red-brown centrally; tomentum very thick, woolly, whitish to red-brown or ±black. Pseudocyphellae white, scattered, round to irregular, 0.2–2 mm diam.; margins swollen, prominent, concolorous with lower surface, often sunken in tomentum. Apothecia marginal to submarginal, rarely laminal, sessile, 0.5–2 mm diam.; disc pale to dark red-brown, smooth, epruinose, sometimes with small central lobules of sterile tissue; exciple prominent in young fruits, slightly roughened to coarsely scabrid-verrucose, pale brownish; epithecium pale red-brown; hymenium colourless. Ascospores fusiform-ellipsoidal, 1–3-septate, (25–) 30.5–33 (–36) × 5.5–8 µm, pale yellow-brown to red-brown. CHEMISTRY: Methyl gyrophorate (±), gyrophoric acid (±), 7β-acetoxyhopane-22-ol, hopane-7β,22-diol (trace) and hopane 15α,22-diol.
  Occurs in north-eastern Qld, on tree trunks in montane rainforest. Also from Indonesia to Samoa and Ogasawara-shotō (Bonin Is.) in the western Pacific.  
  Galloway et al. (2001)  

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

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