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Deep in the darkest rainforest across the valley we found this very large 'leaved' black lichen. The lobes on the rosette in pic 1 were 60mm wide and maybe 90mm long and I think it was a fairly young specimen. Pics 2 and 3 are closer views of what I think was an older specimen which was hanging to a total length of about 400mm and included very convoluted foliose parts (like kale).
Very damp and dark rainforest in national park.
The very dark color and the size of the lobe structures seemed very appropriate for the low-light conditions !?
All species of Peltigera associate with the nitrogen-fixing cyanobacteria Nostoc.