Order: Lecanorales Family: Micareaceae
Species: Micarea prasina
Photos: On shaded moss on sycamore. Snave, Cork, SW Ireland.
Specimen identified by John Douglass
Very variable and frequently sterile, requiring expert identification.
Light green or pale to dark grey-green thallus comprised of +/- dense, +/- globose goniocysts that sometimes form granules. Apothecia (when present) whitish, pale to dark grey, brown-grey or blackish. White, greyish or black pycnidia.
On tree stumps and mature trunks in old-growth woodland.
Thallus and apothecia: chemical reactions negative.
Greenish pigment on thallus surface is K and C +/- violet.
Similar: Micarea micrococca
Micarea prasina. October 2009