Order: Arthoniales Family: Roccellaceae
Species: Enterographa hutchinsiaeGrowth type crustose.
Photo left: On bark. Droum Wood, Co. Cork, SW Ireland.
Thick or thin dark grey to dull olive-green or brownish thallus often forming mosaics divided by black prothallus. Normally fertile with often branched lirelliform or comma-like apothecia, sometimes with whitish margins. Asci are 8-spored, the spores straight or +/- curved, 4-6 septate, 24-28 x 4-5 Ám. Micro photos below.
Chemical reactions negative.
Usually on shaded, damp, often vertical siliceous rocks in steep, wooded ravines and beside streams and loughs. Occasional on exposed tree roots and the trunks of old trees.
Similar: Enterographa crassa. Usually on bark, smaller apothecia.