Nash, T.H., Ryan, B.D., Gries, C., Bungartz, F., (eds.) 2002. Lichen Flora of the Greater Sonoran Desert Region. Vol 1.
Thallus: absent or continuous, smooth, immersed in the substrate, whitish photobiont: absent Perithecia: hemispherical, black, superficial on the substrate, 0.2-0.4 mm diam. ascomatal wall: black, absent below the hamathecium hamathecium: branched pseudoparaphyses, anastomosing above the asci; filaments: c. 2 µm wide, not inspersed with oil droplets asci: clavate, c. 60-75 x 15-20 µm, with 8, irregularly arranged ascospores ascospores: medium to golden brown, clavate to pyriform, 1-septate with a supramedian euseptum, (16-) 17-22 (-25) x (6-) 7-9 (-10) µm; walls: soon becoming ornamented with warts, without or with a c. 2 µm wide gelatinous sheath Spot tests: all negative, UV negative Secondary metabolites: none detected. Substrate and ecology: on bark of various woody plants, e.g. Bursera, Lysiloma and Prunus World distribution: primarily north temperate, previously only known from Europe and Canada Sonoran distribution: rather commonly collected in southern Arizona, Baja California Sur and Sinaloa. Notes: Although it was previously reported to be restricted to Tilia (Hawksworth 1985b), it has subsequently also been found on other tree species (Aptroot 1995 & 1997). The collections from Bursera, Lysiloma and Prunus are additional host records.