• Caloplaca obscurella (Lahm ex Körb.) Th.Fr.
Caloplaca obscurella
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This small, pale to dark grey (greener when wet) crustose epiphyte can usually be located on nutrient-rich or dust-impregnated tree bark, often along waysides, rarely in woodland. As the discs are very tiny and Lecania-like they are the least noticeable aspect of the lichen. The thallus however, is minutely blistered with crater-like vesicles which later become scurfy and sorediate. In Ireland: widespread, except in the west where it is scarce.

Key characteristics

  • Thallus crustose, pale grey to green, minutely blistered, scurfy-sorediate
  • Discs brown, rounded or flat, swollen; spores polarilocular; thallus and discs K-.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Caloplaca obscurella (Lahm ex Körb.) Th.Fr.. [In] LichenIreland. Accessed on 2018-07-17.