Order: Arthoniales Family: Chrysothricaceae
Species: Chrysothrix candelaris
Photos: On shaded oak trunk. Macroom, Co. Cork, SW Ireland.
Thin, leprose thallus of bright or greenish-yellow, granular soredia that can form large, +/- continuous patches in humid woodland. Apothecia are absent in Britain and Ireland.
Reactions variable, C-, K and KC +/- orange, P +/- orange, UV-
Found in dry, shaded crevices on rough-barked deciduous trees, often on oak. Occasional on vertical, shaded acidic rocks.
Similar: Psilolechia lucida. Shaded rock crevices, headstones
Chrysothrix candelaris. October 2009