Thelotrema lueckingii is a species of corticolous (bark-dwelling) crustose lichen in the family Graphidaceae.

[1] Found in the laurel forests of Madeira, it was formally described as a new species in 2013 by Othmar Breuss.

The species epithet honours German lichenologist Robert Lücking.

[2] The lichen has a thick, yellowish-white to greyish-green thallus with a roughened to uneven surface texture.

Ascospores number 2 or 4 per ascus (sometimes 6); they are fusiform (spindle-shaped) and muriform, measuring 55–110 by 15–28 μm.