Lecanora xanthoplumosella Lumbsch & Elix  

Mycobank MB 517791

Thallus thin to thick, verrucose-areolate to verruculose, cream coloured or creamish yellow. Thallus surface smooth, epruinose, isidia and soredia absent. Prothallus well-developed, blackish brown. Apothecia sessile, abundant, dispersed, plane or slightly convex to convex, roundish, 0.5–1.2 mm diam. Apothecial margin lecanorine, concolourous with the thallus, persistent, thick, entire when young, becoming strongly verruculose, disc bluish grey to grey with a thick, granulose, yellowish to yellowish grey pruina. Amphithecial cortex distinct, gelatinous, hyaline, inspersed with small crystals, 10–15 µm thick. Amphithecium with large and small crystals. Parathecium hyaline, 10–15 µm thick, lacking crystals. Epihymenium orange-brown to reddish brown, 15–20 µm thick, granulose with coarse crystals soluble in KOH. Hymenium, subhymenium and hypothecium hyaline. Paraphyses sparingly branched and slightly thickened apically. Asci of Lecanora-type, 8-spored. Ascospores non-septate, hyaline, broadly ellipsoid to ellipsoid, 9.5–13.5 x 6.0–7.5 µm. Pycnidia immersed in verrucae, bluish grey with filiform conidia. Spot tests: K+ yellow, C+ orange; KC+ orange, P+ yellow, UV+ dark orange. Secondary chemistry: thiophanic acid [major], arthothelin [minor], 2’-O-methylperlatolic acid [minor], atranorin [trace], chloroatranorin [trace], 5-chloro-2'-O-methylanziaic acid [minor].