Order: Lecanorales Family: Incertae sedis
Species: Lecania cyrtella
Photos: On Ash twig. Droum Wood, Co. Cork, SW Ireland
Thin light grey or grey-green thallus with usually abundant, very small (<0.5mm), pinkish or brown apothecia. Thin grey thalline margin is excluded with age as discs become convex. Asci 8-16 spored, spores usually 1-septate, 10-15 x 4-5 Ám, often bent when mature. Micro photo below. Chemical reactions negative.
Found on twigs and rough, nutrient-rich bark of Elder, Ash and Acers, often in Xanthorion communities.
Similar: Lecania naegelii, spores longer, mainly 3-septate.