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Abrothallus—Athallia

Acarospora
(including Caeruleum, Myriospora, Silobia)
Acarospora stapfiana Acarospora moenium Acarospora rosulata Acarospora americana Acarospora strigata Acarospora badiofusca
Anisomeridium
(including Ditremis, Microthelia)
Anisomeridium biforme Anisomeridium biforme Anisomeridium polypori Anisomeridium polypori Anisomeridium polypori Anisomeridium polypori
Arthonia
(including Arthothelium, Celidium, Coniarthonia)
Arthonia pruinata Arthonia ruana Arthonia albovirescens Arthonia didyma Arthonia ilicina Arthonia dispersa
Aspicilia
(including Circinaria, Megaspora, Sagedia, Urceolaria)
Aspicilia rogeri Aspicilia candida Aspicilia boykinii Aspicilia hispida Aspicilia aquatica Aspicilia americana
Actinogyra = Umbilicaria
Agyrophora = Umbilicaria
Allocetraria = Dactylina
Amandinea = Buellia
Apatoplaca = Caloplaca
Arctocetraria = Cetraria
Arthothelium = Arthonia
Athallia = Caloplaca