On Quercus sempervirens; spot test negative; asci 8-spored; ascospores at first 3-septate, then submuriform, brown, 15x 8 μm.
On Cupressus sempervirens. Spot tests negative. Photobiont: Trentepohlia. Thallus crustose areolate. Ascospores at first 1-celled, then 1-septate, hyaline, 15x7 µm.
https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_T/Textes_T2/Thelopsis_isiaca.htm