Irish lichens
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Incertae sedis
Species: Racodium rupestre Photos: Below overhang, acidic rock. Gougane Barra, SW Ireland. The thallus forms small patches of dark brown or black, +/- felted filaments. Very similar to Cystocoleus ebeneus but the mycobiont hyphae are straight and not entwined or contorted. Can be locally common in upland areas on shaded, humid, +/- vertical siliceous rocks. Also found below overhangs where it is sheltered from direct rain. Chemical reactions negative. Identification is very uncertain, photographs are probably of the cyanabacteria Stigonema |
September 2009