Consortium of Lichen Herbaria
- building a Global Consortium of Bryophytes and Lichens as keystones of cryptobiotic communities -
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Rhizocarpon geminatum Körb.  
Family: Rhizocarpaceae
[Aspicilia cinerea f. concreta (Ach.) Lederer nom. rejic., moreBiatorina concreta (Ach.) Mudd nom. rejic., Buellia concreta Eckf., Catillaria concreta (Ach.) A. Massal. nom. rejic., Catocarpus concretus (Ach.) Arnold nom. rejic., Catocarpus seductus var. concretus (Ach.) Eitner, Diplotomma petraeum var. concretum (Ach.) Jatta nom. rejic., Lecidea atroalba var. concreta Ach. nom. rejic., Lecidea concreta (Ach.) Nyl. nom. rejic., Lecidea concreta f. geminata (Körb.) Vain., Lecidea confervoides var. concreta (Ach.) Schaer., Lecidea geminata Nyl., Lecidea petraea f. concreta (Ach.) Nyl. nom. rejic., Lecidea petraea var. geminata (Körb.) Boistel, Patellaria concreta (Ach.) Müll. Arg. nom. rejic., Rhizocarpon concretum (Ach.) Zahlbr. nom. rejic., Rhizocarpon concretum f. geminatum (Körb.) Vain., Rhizocarpon montagnei f. geminatum (Körb.) Arnold, Rhizocarpon petraeum var. concretum (Ach.) Boistel, Rhizocarpon petraeum var. geminatum (Körb.) Boistel]
Rhizocarpon geminatum image
Stephen Sharnoff
  • Greater Sonoran Desert
  • Resources
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, verrucose; prothallus: black among the areoles areoles: rounded, flat to more often convex, 0.3-0.8 mm in diam. surface: usually gray, sometimes gray-brown, somewhat pruinose cortex: thin, 5-15 µm thick, overlain with an epinecral layer 5-15 µm thick medulla: white or yellow due to rhizocarpic acid Apothecia: black, adnate or among the areoles, 0.4-0.6(-1) mm in diam. disc: black, flat or becoming convex, dull, epruinose margin: at first +thick, then mostly absent epihymenium: brown to brownish black, 15-25 µm thick, K+ red hymenium: hyaline, 100-140 µm tall; paraphyses: coherent, scarcely branched; hypothecium: brown asci: clavate, 2-spored ascospores: pale green initially, becoming olive-brown to brown, muriform, ellipsoid, (28-)35-60(-67) x (13-)1828(-35) µm, halonate Pycnidia: frequent, black, almost globose, on the prothallus conidia: hyaline, filiform, 8-12 x 0.3-0.6 µm Spot tests: medulla K+ weak yellow or occasionally K+ red, rarely K-, C-, KC-, P+ yellow to red, P- Secondary metabolites: rhizocarpic, stictic and +norstictic acids. Substrate and ecology: in cold and wet regions World distribution: throughout western and northern North America and Greenland, Europe and South America Sonoran distribution: Arizona and southern California. Note: A chemotype with yellow, K-, P- medulla usually has dark brown, small, plane, angular areoles and is restricted to +calciferous rocks in the lowlands may represent a distinct taxon.
Rhizocarpon geminatum
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Rhizocarpon geminatum image
Stephen Sharnoff
Rhizocarpon geminatum image
Stephen Sharnoff
Rhizocarpon geminatum image
Stephen Sharnoff
Rhizocarpon geminatum image
Stephen Sharnoff
Rhizocarpon geminatum image
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Garry Neil
Rhizocarpon geminatum image
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Rhizocarpon geminatum image
Garry Neil
Rhizocarpon geminatum image
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This project made possible by National Science Foundation Awards: #1115116, #2001500, #2001394
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