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North American Lichen Herbaria
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Rhizocarpon polycarpum (Hepp.) Th. Fr.  
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Family: Rhizocarpaceae
[Buellia atroalbella (Nyl.) Mong., moreBuellia badioatra var. atroalbella (Nyl.) Mudd, Buellia badioatra var. atrobadia (Nyl.) A.L. Sm., Lecidea atroalba var. atroalbella Nyl., Lecidea atroalbella (Nyl.) Nyl., Lecidea atrobadia Nyl., Lecidea confervoides var. polycarpa Hepp]
Rhizocarpon polycarpum image
  • Greater Sonoran Desert
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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, not lichenicolous Thallus: crustose, areolate; prothallus: black, marginal and among the areoles areoles: usually contiguous and angular or crescent-shaped around the apothecia, sometimes dispersed, flat to convex, 0.3-0.8 mm wide surface: pale to dark brown or reddish-brown, rarely grayish brown cortex: few cells of hyphae, the uppermost with a dark cap, with a thin layer of polysaccharides medulla: white lower cortex: KI+ intensely blue Apothecia: dispersed to aggregated, rounded to polygonal, slightly constricted at the base, sessile, 0.4-0.8 mm wide disc: black, mostly flat, rarely convex, epruinose margin: thin or lacking exciple: red-brown to brown to brownish-black, becoming ligher to the interior epihymenium: brown to violet-brown, K+ red-violet or red, rarely K- hymenium: hyaline to faintly greenish blue above, 80-100(-130) µm tall; paraphyses: coherent, branched, 2-3 µm wide below, 3-5 µm wide apically, with brownish black tips; hypothecium: reddish-brown to brown, K- asci: clavate, c. 80 x 20 µm, 8spored ascospores: predominately hyaline but becoming pale brown, 1(-3) septate, 17-30 x 8-11(-14) µm, halonate Pycnidia: not seen Spot tests: medulla mostly K-, rarely K+ very light yellow, C-, KC-, P- yellow; epihymenium K+ red, exciple K+ red solution Secondary metabolites: norstictic acid and stictic acid. Substrate and ecology: on siliceous rocks in moderately cold and humid areas World distribution: holarctic, North America, Greenland and Eurasia Sonoran distribution: eastern Arizona.
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Rhizocarpon polycarpum
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Rhizocarpon polycarpum image
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This project made possible by National Science Foundation Awards: #1115116