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Ocellularia—Orphniospora

Opegrapha
(including Leciographa, Opegraphoidea)
Opegrapha herbarum Opegrapha varia Opegrapha rupestris Opegrapha atra Opegrapha gyrocarpa Opegrapha viridis
Omphalaria = Thyrea
Omphalodiscus = Umbilicaria
Opegraphoidea = Opegrapha
Orcularia = Buellia