• Micarea denigrata (Fr.) Hedl.
Micarea denigrata
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(Map updated: 11 August 2009)

Growing usually as a pioneer coloniser of old tree stumps and untreated timber (for example, wooden posts and panel fencing), M. denigrate, despite its remarkable range of variation is usually a relatively easy lichen to name. This is not because of the grey-black scurfy thallus or the colour, shape or size of the discs, but because of the presence of numerous grey or blackish pycnidia, tipped with a small white blob of jelly (mesoconidia). Simply stated, they appear as little dark grey rods with white dots on top. Down the weathered surface of exposed wood it can occur in sheets. In fact it may be growing on your old garden panel fencing right now. Discs frequent, small (to 5mm diam.) mostly black. Throughout, but absent from the extreme west.

Key characteristics

  • Told by the numerous dark grey pycnidia with white blobs of jelly extruded from the tops
  • On rotting tree stumps, fallen timber and untreated timber such as cheap garden fencing and picnic tables.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Micarea denigrata (Fr.) Hedl.. [In] LichenIreland. Accessed on 2019-01-16.