Order: Lecanorales Family: Micareaceae
Species: Micarea micrococca
Photos: On pine needles on zinc roof. Ballingeary, Co. Cork, SW Ireland. Identification by John Douglass
Very variable and often sterile. Light green to pale or dark greyish green thallus of scattered or dense goniocysts that can coalesce forming granules. Convex, subglobose or tuberculate apothecia, whitish, greyish or brown-black. Pycnidia white or greyish round ostioles. In moist situations often infected by non-lichenised algae.
Usually in shaded situations on acid bark and twigs, tree stumps, fallen debris, especially in conifer plantations. Also on soil or debris in coastal rock crevices. Thallus and apothecia reactions negative. Greenish pigment K+/- violet, C+/- violet, N+/- red
Similar: Micarea prasina
Micarea micrococca August 2009