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Sticta dufourii (not available at the choice given by the upload software) is considered the blue green (cyanobacterial) morph of S. canariensis, whose green morph is considered as S. canariensis sens str.

It is one of the rare lichens here, of which I know only only one big population that covers a wall (~ 6-8 m^2) in the forest. Apart from that, only small specimens here and there, like the one in the photos. The last two photos were took at home and prentend to illustrate the irregular lobes and the isidia at their margins as well as the pseudocyphellae, after press a lobe inside a sheet of paper to flattened it in order to avoid unfocused areas.