Irish lichens

Verrucaria nigrescens
Order: Verrucariales       Family: Verrucariaceae

Species: Verrucaria nigrescens

Growth type crustose.
Photos: On churchyard memorial. Macroom, Cork, SW Ireland.

Dark brown to blackish thallus regularly cracked into +/- smooth areoles, occasionally with blastidiate margins. Perithecia half to three-quarters immersed. Prothallus inconspicuous or absent.

Very common throughout Ireland on calcareous rocks, walls and mortar, rare on acidic rocks. Chemical reactions negative.

Verrucaria nigrescens       Verrucaria nigrescens

Verrucaria nigrescens
Verrucaria nigrescens. Protestant churchyard, Macroom, Co.Cork. December 2008

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