Index → Navels → Umbilicaria → U. rigida= Agyrophora rigida (Du Rietz) Llano
= Gyrophora anthracina (Wulfen) Körber
= Umbilicaria coriacea Imshaug
 Location: Northwest Territories, near MacKay Lake
Date: 2011-08-02
Photo by: Curtis Björk
Notes: On siliceous rock in brushy tundra
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 Location: Nunavut, Continental Central Canadian Arctic, Hope Bay
Date: 2014-07-02
Photo by: Curtis Björk
Notes: On rock in tundra
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 Location: Nunavut, Continental Central Canadian Arctic, Hope Bay
Date: 2014-07-02
Photo by: Curtis Björk
Notes: On rock in tundra
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