Order: Lecanorales       Family: Ramalinaceae Species: Bacidia rubella Growth type crustose. Photos: On mature Oak. Bantry House, Co. Cork, SW Ireland. Thallus yellow-green to greyish minutely granular, the granules appearing isidia-like. Sessile apothecia are flat or slightly convex, pale to dark reddish-brown, the margins usually persistent and sometimes pruinose. Spores 3-7(-13) septate, (35-)40-70(-75) × 2.5-3(-4) µm. Pycnidia pale pink to reddish-brown. Micrograph below. Chemical reactions negative. On nutrient-rich bark on the trunks of mature trees on rich soils. Rare on sheltered walls and gravestones, absent in polluted areas.

Micrograph

Bacidia rubella November 2009