Irish lichens

Verrucaria macrostoma

Order: Verrucariales       Family: Verrucariaceae

Species: Verrucaria macrostoma

Growth type crustose.
Photos: On church wall, the Burren, Co. Clare, Ireland.

Well-developed, superficial, mid-brown thallus, darker in exposed locations, paler brown in shade. Rounded or lobed areoles often cracking into large secondary areoles. Areoles more/less subsquamulose. Black perithecia not leaving pits when decayed.

Found throughout Ireland on calcareous rocks, limestone and on mortar. Chemical reactions negative.

Similar: V. macrostoma f. furfuracea. Blastidiate.

Verrucaria macrostoma

Verrucaria macrostoma
Verrucaria macrostoma. BLS meeting, the Burren. April 2009

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