Nash, T.H., Ryan, B.D., Gries, C., Bungartz, F., (eds.) 2004. Lichen Flora of the Greater Sonoran Desert Region. Vol 2.

Life habit: lichenized Thallus: thick, areolate, margin rarely lobate when very young; prothallus: dark between areoles, rarely present at margin areoles: plane, sometimes becoming convex or even subglobose, 0.6-1.6 mm wide surface: ochraceous to brown, waxy Apothecia: frequent, crypotolecanorine or lecanorine, innate at first and remaining broadly attached, usually one per areole, 0.5-0.9 mm in diam. disc: black, dull, plane to convex, margin with aeruginose pigment reacting N+ red; epihymenium: brown hymenium: hyaline, I+ blue; paraphyses: simple or weakly branched; hypothecium: hyaline asci: cylindrical, 8-spored ascospores: brown, 1-septate, 10.515 x 5.5-9 µm, strongly ornamented Pycnidia: frequent, immersed, initially one per areole, ostiole with aeruginose pigment conidia: hyaline, simple, bacilliform, 5.5-7.5 x 1-1.5 µm Spot tests: K-, C-, KC-, P- Secondary metabolites: atranorin in low amounts in cortex. Substrate and ecology: on acidic rocks, basalt World distribution: southwestern, coastal North America Sonoran distribution: southern California, Guadalupe Island, Baja California, from cliffs above the sea to 750 m. Notes: Dimelaena weberi is a rare southern coastal species. bose areolae are remarkably similar to Mobergia angelica. It is distinguished from D. californica and D. thysanota by its ochraceous thalli and large areole. Thalli with subglo-