• Tephromela grumosa (Pers.) Hafellner & Cl.Roux
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Tephromela grumosa
© Mike Simms
Tephromela grumosa
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(Map updated: 11 August 2009)

Click here to view an interactive map of the Northern Ireland dataset as currently collated by CEDaR.
The map is generated through the NBN Gateway using their Interactive Mapping Tool.


To understand the gist of this species, you should imagine Tephromela atra without discs and the centre of the thallus dissolved into a mist of blue-grey, minutely granular soralia. T. grumosa is K+ yellow and grows on friable siliceous rock surfaces, for example, sandstones, including man-made structures such as sandstone walls and old churches. In Ireland, it appears to be restricted to the north and north-east.

Key characteristics

  • Thallus like that of T. atra but centre of thallus sorediate, very rarely with discs
  • Spot tests K+ yellow only; on sandstone or similar textured siliceous rocks.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Tephromela grumosa (Pers.) Hafellner & Cl.Roux. [In] LichenIreland. Accessed on 2018-07-19.