Nash, T.H., Ryan, B.D., Gries, C., Bungartz, F., (eds.) 2002. Lichen Flora of the Greater Sonoran Desert Region. Vol 1.

Thallus: inconspicuous, superficial, partially indistinct, membranous to rimose upper surface: pale brown to gray-brown, smooth prothallus: absent Perithecia: immersed but appearing as prominent warts, dispersed; ostiole pale brown; involucrellum: absent; exciple: colorless to pale brown hamathecium: composed of persistent paraphyses, richly branched and anastomosed; periphysoids towards the inner side of the ostiole; periphyses absent asci: cylindrical, 8-spored ascospores: colorless, submuriform to rarely muriform, with 6-7 lateral septa and 1 (-2) longitudinal septa, narrowly ellipsoid, 20-30 x 7-11 µm Pycnidia: not seen Spot tests: all negative Secondary metabolites: none detected. Substrate and ecology: bark, (on smooth bark of Quercus agrifolia and Juglans californica in southern California) World distribution: southern California and temperate Australia Sonoran distribution: San Gabriel Mountains and the Santa Monica Range in southern California. Notes: Thelenella sychnogonioides is characterized by its inconspicuous thallus, immersed perithecia appearing as prominent warts and submuriform ascospores. The arctic-alpine distributed Thelenella pertusariella is distinguished by its darker thallus and smaller ascospores.