Order: Lecanorales Family: Bacidiaceae
Species: Tephromela atra var. torulosa
Photos: On tree trunk. Gougane Barra, Co. Cork, SW Ireland.
Fresh thallus is slightly greenish-white. T. atra var. torulosa has a smaller thallus and apothecia than var. atra. The apothecia are less than 1mm diameter, var. atra has apothecia 1-2.5mm. The asci are 8-spored, spores simple, 10-15 x 5-8 Ám.
Cortex K+ yellow, C-, KC+ yellow, P-. Medulla UV+ ice-white. Apothecia purplish-red in section.
Rare on deciduous trees, especially on branches.
Tephromela atra var atra is occasionally found on trees but the apothecia are larger, 1-2.5mm diam.
Tephromela atra var. torulosa. August 2009