Thelotrema lueckingii
Thelotrema lueckingii and Thelotrema lepadinum are closely related, corticolous (bark-dwelling) crustose lichens in the family Graphidaceae. T. lueckingii was relatively recently separated from T. lepadinum based on the consistent presence of yellow pigments in the medulla and within the fertile warts. This paragraph was generated with the assistance of Google Gemini 3 AI
Previously I thought this huge patch of Thelotrema on this Quercus robur was Thelotrema lepadinum but I hadn’t tested it with chemical reagents. Today I tested its thallus with potassium hydroxide; it was dark yellow. T. lepadinum tests negative to potassium hydroxide; but T. leuckingii tests red to potassium hydroxide. This tested dark yellow. So it may be Thelotrema lueckingii?
For more inofrmation see: A liverwort and some lichens in Lake Wood, Uckfield, East Sussex. 26.01.26
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