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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
Umbilicaria cinereorufescens (Schaer.) Frey

Hedwigia 71: 109 (1931)

Umbilicaria vellea γ spadochroa ε cinereorufescens Schaer., Enum. Crit. Lich. Eur. 25 (1850).

T: Switzerland; holo: G (Herb. Schaerer) n.v.

  Thallus 5–12 cm wide, usually monophyllous; lobes entire, rigid, coriaceous, orbicular, with or without broad folds; margins entire or incised-torn. Upper surface dull, smooth to scabrid, areolate, occasionally with rhizinomorphs protruding through cracks or splits, cream-buff or pale grey to violet-grey or slaty, with occasional reddish staining, pruinose or not, rarely somewhat eroding. Isidia and soredia absent. Lower surface mostly coarsely papillate or verrucose, covered with a thick matt of rhizinomorphs, ±trabeculate around the flat or slightly raised umbilicus, frequently with lamellae fading or extending to the margins and becoming fimbriate, black, occasionally with dark brown margins. Rhizinomorphs of two types: dense, short, squat, black, ball-tipped and covered in thalloconidia, these interspersed with scattered long cylindrical dark brown to black rhizinomorphs blackened at the base due to thalloconidia. Thalloconidia on lower surface of thallus, on surface of ball-tipped rhizinomorphs, or at base and tips of cylindrical rhizinomorphs; cells ±rounded, 5–7 (–10) µm wide, brown, thick-walled, frequently forming clusters 17–25 µm wide. Apothecia not seen in Australian specimens; Hestmark (2004) reported these to be rare, gyrose; ascospores brown, muriform, 8–15 × 4–9 µm. Pycnidia scattered, immersed, visible as black dots on the upper surface. Conidia bacilliform, 3–4 (–5) × 0.5–0.7 µm.
CHEMISTRY: Medulla K–, C+ red, KC+ red, P–; containing gyrophoric acid (major).
  Known from a granite overhang at an altitude of 1700 m in alpine N.S.W. Also in East Africa, North America, Europe, Greenland and Asia.  
  Louwhoff (2009c)  

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

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