Opegrapha ochrocheila Roccellaceae
Opegrapha ochrocheila

Growth type crustose
Chemical results: Orange pruina K+ red-purple

Can be locally frequent on dry, shaded deciduous bark in mature woodland, particularly on Oak. Rare on sheltered siliceous rocks.

Thin or immersed whitish-grey thallus, sometimes tinged brownish or olive-green. Lirellae with open discs, the margins and sometimes also the discs with reddish-orange pruina. Spores 3-septate, (12)14-16(-22) 3-4.5(5) m, perispore absent. Microscope photograph below.

Similar: Opegrapha herbarum has non-pruinose lirellae, 3-septate spores with perispore.


Opegrapha ochrocheila

Microscope photograph
Opegrapha ochrocheila
Opegrapha ochrocheila
Studland, Dorset. April 2015

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