Synonyms: Bilimbia crozalsiana (H. Olivier) B. de Lesd.
Distribution: S - Cal (Puntillo 1996, Puntillo & Puntillo 2004).
Description: Thallus crustose, episubstratic, whitish to pale brown, mostly powdery. Apothecia lecideine, up to 1.2 mm across, with a black, often whitish pruinose, flat disc, and a whitish, at first crenulate then smooth proper margin. Epithecium yellowish brown, K-; hymenium and hypothecium colourless; paraphyses simple or sparingly branched, rather lax, the apical cells slightly swollen. Asci 8-spored, cylindrical-clavate, surrounded by a gelatinous I+ blue coat, with a well-developed I+ blue tholus, an I+ darker blue tube and a well-developed ocular chamber, Bacidia-type. Ascospores (1-)3-septate, hyaline, ellipsoid or kidney-shaped, 20-23 x 4-6 µm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-. Chemistry: thallus without lichen substances.
Note: a humid subtropical lichen of more or less isolated trees in warm-humid areas, exclusively Tyrrhenian in Italy. The record from the Province of Cuneo by Piervittori (2003) appears dubious to me, and is not accepted here. The species is included in the Italian red list of epiphytic lichens as “Endangered” (Nascimbene & al. 2013c).