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Fuscidea recensa var. arcuatula (Arnold) Fryday
Family: Fuscideaceae
[Lecidea arcuatula (Arnold) Nyl.]
Fuscidea recensa var. arcuatula image
Gary Perlmutter  
Fryday, A.M. 2008. The genus Fuscidea (Fuscideaceae, lichenized Ascomycota) in North America. Lichenologist 40(4): 295 - 328.