Verrucaria muralis Verrucariaceae
Verrucaria muralis

Growth type crustose
Chemical results negative

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

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 photographs below.


Verrucaria muralis

Verrucaria muralis

Verrucaria muralis

Microscope photographs
Verrucaria muralis, spores

Verrucaria muralis, spores
Verrucaria muralis
Westbourne and Branksome Park, Dorset and on cockle shell, Hampshire. February and November 2013, February 2017

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