Irish lichens

Verrucaria muralis

Order: Verrucariales       Family: Verrucariaceae

Species: Verrucaria muralis

Growth type crustose
Photos: On rock. Ballinagree, Co. Cork, Sw Ireland

White to greenish-white thallus, immersed, smooth or cracked. Black perithecia are immersed or prominent, leaving shallow pits in substrate. Spores (17-)20-24(-27) x (7.5-)10-12.5(-14.5) Ám.
Microscope photograph below.

Common on bricks, mortar, soft limestone rocks and on pebbles

Microscope photograph

Verrucaria muralis . April 2012

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