On a riverside granite boulder. Apothecia black, flat, lecideine. Spot tests negative, except thallus is IKI+ blue. Spores muriform, 23-28 x 9-13, which is too short for it to be R. lavatum. Although the healthy spores were colourless, one apothecium contained brown, shrivelled spores as well.
Sur un rocher de granit au bord de la rivière. Apothécies noires, plates, lécidine. Tests ponctuels négatifs, sauf que le thalle est IKI+ bleu. Spores muriformes, 23-28 x 9-13, trop courtes pour être R. lavatum. Bien que les spores saines soient incolores, une apothécie contenait également des spores brunes et ratatinées.
For the record, this appears to be a volunteer sapling from somewhere.
Epiphytic! Part 2