• 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)

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 2019-12-10.