Calogaya pusilla (A. Massal.) Arup, Fröden & Søchting = Caloplaca pusilla (A. Massal.) Zahlbr.

     Thallus in small rosette 1-2 (3) cm in diameter, margin characterized by short, tight, slightly palmate lobes, convex, pleated, pruinose, dull coloring sometimes cocarde-shaped, brownish in the center (old specimens), cream to the base of the lobes, slightly salmon-yellow-orange, orange-yellow, yellowish at the margin. Apothecia generally abundant, scattered over almost the entire thallus (except at the margin), sometimes of two kinds, zeorines or pseudolecanorines, disc orange-brown, orange, thin margin concolored to the thallus or yellow-ochraceous. Polarilocular spores, somewhat diamond-shaped, 10-15 x 5-8 µm with a central thickening greater than 1/3 of the length. Photobiont: trebouxioid. Thallus and apothecia: K+ purple. Very nitrophilous species coming in large flocks on hard limestone rocks but also on walls (even in town!) in areas rich in nitrogen derivatives (bird droppings) and often not far from the sea.

_ Very close species to Caloplaca saxicola to such an extent that some authors make it a synonym!