Crustose and placodioid lichens 
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Acarospora sulphurata
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Acrocordia conoidea
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Amandinea cacuminum
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Amygdalaria panaeola
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Album: Acarospora
Contains: 79 items.
Album: Acrocordia
Contains: 7 items.
Album: Amandinea
Contains: 8 items.
Album: Amygdalaria
Contains: 11 items.
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Arthonia leucopellaea
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Arthopyrenia analepta
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Arthrorhaphis citrinella
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Arthrosporum populorum
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Album: Arthonia
Contains: 33 items.
Album: Arthopyrenia
Contains: 1 item.
Album: Arthrorhaphis
Contains: 3 items.
Album: Arthrosporum
Contains: 4 items.