Thallus: relatively thick, superficial, rimose-areolate to uneven warted upper surface: ochre-brown to bright reddish brown; smooth to rough, dull prothallus: indistinct Perithecia: dispersed to crowded, globose to slightly pear-shaped, 0.2 to 0.5 mm diam.; ostiole brown; involucrellum: absent; exciple: colorless below, brownish above; hamathecium: composed of persistent paraphyses, richly branched and anastomosed; periphysoids towards the inner side of the ostiole; periphyses absent asci: cylindrical, 4- to 8-spored ascospores: colorless, muriform, with 6-8 lateral and 2-3 longitudinal septa, narrowly ellipsoid, 24-36 x 9-13 µm Pycnidia: immersed conidia: filiform, colorless, 13-15 x 0.6-0.8 µm Spot tests: all negative Secondary metabolites: none detected. Substrate and ecology: lava, granite, schist; dry and exposed slopes with low vegetation World distribution: SW Europe, Macaronesia and SW North America Sonoran distribution: Santa Monica Range in southern California and Chiricahua National Monument in Arizona. Notes: Thelenella inductula is characterized by its relatively thick, rimose- areolate, ochre brown to bright reddish brown thallus and colorless ascospores. The other saxicolous species in the area, Thelenella weberi, is distinguished by the presence of an open involucrellum and its larger ascospores.