Verrucariaceae Verrucaria macrostoma f. furfuracea Growth type crustose Chemical results negative Found on calcareous rocks, limestone and on mortar The pale to dark brown, areolate or almost squamulose thallus is very similar to V. macrostoma f. macrostoma but perithecia are absent. Instead soredia and isidia-like blastidia (vegetative propogules) develop on the edges of the areoles. Similar: Verrucaria macrostoma f. macrostoma, blastidea absent, perithecia present

Verrucaria macrostoma f. furfuracea
Steeple, Dorset. February 2014