Leproplaca

Leproplaca is a genus of lichen-forming fungi in the family Teloschistaceae. The genus was originally proposed by William Nylander in 1883 as a subgenus of the larger genus Lecanora, based on specimens he found growing on limestone rocks in France and near the Dead Sea. The genus was later formally accepted in 1974 and confirmed as a distinct evolutionary lineage through molecular studies in 2013, though it has undergone various taxonomic revisions over the decades. Leproplaca lichens have a distinctive leprose growth form, appearing as conspicuously powdery, yellow-orange crusts where the thallus consists primarily of asexual propagules called soredia. They rarely produce sexual fruiting bodies (apothecia), instead reproducing mainly through these tiny detachable particles that contain both fungal and algal cells....read more on Wikipedia.