• Lecidella scabra (Taylor) Hertel & Leuckert
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Lecidella scabra
© Mike Simms
Lecidella scabra
© Mike Simms
Lecidella scabra
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A common crustose lichen of brick wall tops, standing stones and sandstone monuments, both in the country and the town. It is often overlooked, but the speckled-green to grey granular thallus pocked with blue-green soralia (spots) can easily catch the eye. The blue-green colour alone should be sufficient to attract attention. A useful test is to apply a dab of fresh bleach which will turn the thallus orange. Black discs are occasionally present.

Key characteristics

  • Grey-green thallus with scattered blue-green soralia: a combination which is soon memorised. Discs black, slightly convex
  • Spot test: dab of fresh bleach will turn it orange.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Lecidella scabra (Taylor) Hertel & Leuckert. [In] LichenIreland. Accessed on 2018-08-16.