Order: Incertae sedis Family: Arthopyreniaceae
Species: Arthopyrenia analepta
Photos: On Birch and Hazel. Co. Cork, SW Ireland.
Specimen immediately below identified by John Douglass
Inconspicuous thin or evanescent non-lichenised thallus, often brownish on Hazel and Oak. No orange colour when scratched. Large, +/- oval perithecia, base of discs surrounded by a dark, flat, halo-like shadow. Pycnidia are sometimes present. The asci are cylindrical, the spores 1-septate with a wide, colourless perispore, 15-23 x 5.5-8 Ám. Micro photos below. Chemical reations negative.
Occurs on smooth, moderately shaded bark and is often an early coloniser of twigs and small branches.
Similar: Arthopyrenia punctiformis