Irish lichens

Buellia ocellata

Order: Lecanorales       Family: Physciaceae

Species: Buellia ocellata

Growth type crustose
Photos: On upland rock. Ballingeary, Co. Cork, SW Ireland.

Small, areolate, green-grey or yellow-grey thallus, sometimes with black prothallus. Immersed black apothecia, epithecium brown to olive. Spores brown, 1-septate, (11-)13-17(-21) x 6.5-9(-11) Ám. Microscope photographs below.
K-, C+ persistent orange, P-, UV-

Found on exposed siliceous rocks, stonework and pebbles, often forming mosaics with Buellia aethalea.

Similar: Buellia aethalea, variable, K-, C-, or K+/- yellow going red

Buellia ocellata

Microscope photographs
Buellia ocellata, ascospores

Buellia ocellata
Buellia ocellata April 2012

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