This paper treats Caloplaca cerina, C. crocea and C. erythrantha with brief comments on C. pinicola, C. haematites and two unnamed taxa. Several new synonyms are presented and lectotypes are designated for C. borealis, C. ulmorum and C. erythranthoides. Epitypes are designated for C. cerina and C. stillicidiorum. Maps and color photographs are provided for the main species treated and a key for the identification of taxa in North and Central America.
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Vol. 110 • No. 4