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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
Cryptothecia exilis G.Thor

Symb. Bot. Upsal. 32(1): 281 (1997)

T: Holmes Jungle, 12.5 km NE of Darwin, N.T., 12°24’S, 130°56’E, corticolous in rainforest margin, 4 Dec. 1985, G.Thor 5818; holo: CANB; iso: UPS.

  Thallus to 5–10 cm wide, adnate, smooth, dull, grey to bluish grey, with or without paler sometimes slightly raised areas, to 0.1 mm thick; isidia and globose granules absent. Prothallus indistinct, mainly of interwoven hyphae, whitish. Photobiont cells solitary or a few cells aggregated, 7–15 × 5–10 μm. Medulla distinct, white. Ascigerous parts common, immersed in the medulla. Asci weakly aggregated, fragile, 6–8-spored, but usually lacking spores. Ascospores ellipsoidal, sometimes less curved on one side, 55–65 × 30–36 μm. Pycnidia rare, scattered, solitary, immersed to elevated, black. Conidia bacilliform, 3–5 × c. 1 μm.
CHEMISTRY: Thallus K–, C–, KC–, P+ yellow, UV–; containing psoromic acid (major), 2’-O-demethylpsoromic acid (trace), subpsoromic acid (trace).
  This endemic species occurs on bark in coastal and monsoon vine forests in the N.T.  
  Elix (2009c)  

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

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