Craven Vale, Brighton, Sycamore. 27.01.26

 

Ramalina fraxinea 

They are only 17 Ramalina fraxinea records in 12 places (all of them rural) in the British Lichen Society database for East and West Sussex,

It is an“International Responsibility” (IR) lichen i.e. a lichen species whose populations in a specific country (e.g. the UK) are internationally significant. Because the national population is so important to the overall survival of the species, the nation has a special responsibility to protect it from extinction or decline.

For more information see: Ramalina fraxinea in a Brighton suburb: under-recording of (urban) Lichens. 27.01.26

 

Lake Wood, Uckfield. Pedunculate OK. 26.01.26

 

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