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Agonimia tristicula (Nyl.) Zahlbr.
Family: Verrucariaceae
[Acarospora fuscata f. tristicula (Nyl.) H. Magn.,  more]
Agonimia tristicula image
Jim Bennett  
Thallus: delicately squamulose, forming small aggregates several mm across squamules: 0.1-0.5 mm wide, ± crowded, adnate to ascending, flat or convex, roundish to elongate, more rarely digitiform or divided into coarsely subgranular segments upper surface: grayish brown or green-brown to fawn, green when wet, dull anatomy: paraplectenchymatous throughout, with no distinct cortices; algal cells: distributed throughout most of the thallus lower surface: pale Perithecia: prominent, black, barrel-shaped, up to 0.5 mm broad, surface rough and wrinkled asci: clavate, 2-spored ascospores: strongly muriform, elongate-ellipsoid, hyaline to pale yellow-brown, c. 80-120 x 30-50 micro meters Pycnidia: unknown Spot tests: all negative Secondary metabolites: none detected. Substrate and ecology: over soil, mosses or debris, mainly over calciferous ground, rarely on nutrient-rich bark, mainly upland World distribution: Europe, Macaronesia, North America, Pacific islands Sonoran distribution: very rarely found in Arizona, but certainly overlooked.