Nash, T.H., Ryan, B.D., Gries, C., Bungartz, F., (eds.) 2004. Lichen Flora of the Greater Sonoran Desert Region. Vol 2.
Apothecia: black, dispersed, immersed to erumpent, broadly attached to the substrate, 150-250 µm in diam., initially almost closed, except for a pore-like opening, covered by the exciple which divides by 3-4 deep cruciately arranged fissures in older ascomata; hairs: not visible exciple: brown to orange-brown, K-, paraplectenchymatic, not prolonged in a stipe, laterally 15-20 µm wide hairs: hyaline to brown, smooth, septate, restricted to the excipular margin, up to 20 x 2.5 µm hymenium: with paraphyses easily separating epihymenium: green, K+ olivaceous paraphyses: hyaline, septate, 2-2.5 µm thick, simple or sometimes branched (mainly near the apex), apically slightly thicker and pale green; ascogenous hyphae: with crosiers asci: subcylindrical, 30-46 x 5.5-7 µm, wall apically not thickened, KI-, 8-spored ascospores: hyaline, simple, ellipsoid, biguttulate, 7-8.5(-10.5) x (2.5-)3-3.5 µm Conidiomata: rare, almost indistinguishable from cruciate ascomata. Host: Diploicia canescens (thallus) over wood or rocks, not visibly damaging the host World distribution: British Isles, Canary Islands, Morocco, and California Sonoran distribution: once collected in southern California.