Paralecanographa grumulosa forme parasite de Dirina massiliensis forma sorediata taxon méditerranéen des murs calcaires.

    This taxa parasites Dirina massiliensis forma sorediata Mediterranean taxa of limestone walls on which it forms large colonies. At first, parasitism is characterized by very numerous apothecia, packed ones against each others, convex and covered by a strong whitish pruine, then apothecia move aside ones from each others and become flat and less powdered, at the end the host's thallus disappears and Lecanographa grumulosa seems to lead a free living. Rare, growing on sheltered walls of ancient buildings in the Mediterranean area.