Opegrapha dolomitica Opegraphaceae
Opegrapha dolomitica

Growth type crustose. BLS conservation evaluation: LC NS
Chemical results negative. Epithecium brown, K

Occurs on sheltered, moist limestone, calcareous schists, mortar or base-enriched siliceous rock, often in damp, shady recesses and underhangs.

The pale grey, greenish or brownish-red thallus is thin, either smooth or cracked and often +/- immersed. Blackish-brown, sessile to semi-immersed lirellae variable, longitudinally furrowed or sub-gyrose, disc remaining slit-like. Spores 3(-4) septate, (20-)22-26(-31) 5-8 m. Micrographs below

Similar: Arthonia calcarea (Opegrapha calcarea) has shorter spores


Opegrapha dolomitica

Opegrapha dolomitica

Opegrapha dolomitica

Microscope photographs
Opegrapha dolomitica
Opegrapha dolomitica
Puddletown, Dorset. May 2017

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