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Rhizocarpon eupetraeum (Nyl.) Arnold
Family: Rhizocarpaceae
Rhizocarpon eupetraeum image
Life habit: lichenized, not lichenicolous Thallus: crustose, areolate, 2-6 cm in diam.; prothallus: strongly developed areoles: peltate, mostly close together forming a continuous thallus, rarely scattered, 0.3-0.8(-1.4) mm wide, 0.4-0.8 mm thick surface: usually gray, rarely gray-brown, or pale brown to brown where abraded, almost always strongly to very strongly convex, smooth, dull; medulla: white Apothecia: 0.3-0.9 mm in diam. disc: black, mostly flat with thin margin to convex-immarginate epihymenium: brown to brown-black, K+ strong red or sometimes K- hymenium: hyaline, 100-140(-160) µm tall; paraphyses: tips fused into a pseudoparenchymatous tissue; hypothecium: brown asci: clavate, 4(-5)-spored ascospores: dark brown to brown-black, muriform, many-celled, 22-42 x 10-18 µm Pycnidia: black, almost globose, on the prothallus or immersed in the areoles conidia: hyaline, filiform, 8-14 x 0.5-1.4 µm Spot tests: medulla K+ yellow, C-, KC-, P+ pale yellow Secondary metabolites: norstictic acid. Substrate and ecology: on acidic rocks, World distribution: arctic-alpine to temperate, western and northern North America and Greenland Sonoran distribution: Arizona and southern California.
Rhizocarpon eupetraeum image
Andrew Khitsun  
Rhizocarpon eupetraeum image
Andrew Khitsun  
Rhizocarpon eupetraeum image
Rhizocarpon eupetraeum image
Rhizocarpon eupetraeum image
Rhizocarpon eupetraeum image
Rhizocarpon eupetraeum image
Rhizocarpon eupetraeum image
Rhizocarpon eupetraeum image
Andrew Khitsun  
Rhizocarpon eupetraeum image
Andrew Khitsun  
Rhizocarpon eupetraeum image
Rhizocarpon eupetraeum image
Rhizocarpon eupetraeum image
Rhizocarpon eupetraeum image
Rhizocarpon eupetraeum image
Rhizocarpon eupetraeum image
Andrew Khitsun  
Rhizocarpon eupetraeum image
Andrew Khitsun  
Rhizocarpon eupetraeum image
Rhizocarpon eupetraeum image
Rhizocarpon eupetraeum image
Rhizocarpon eupetraeum image