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Ocellularia—Orphniospora

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