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    Lichen iridescence    

 

Iridescence caused by a layer of an unknown substance on these lichens. In each case, the first photo was taken with direct sunlight shining on the lichen, whereas I blocked the sun in the second picture. This way, only diffuse light would shine on the lichens, removing the iridescence effect.

2015-03-14 direct light || diffuse light.

 

2016-04-09 direct light || diffuse light.

 

2016-04-09 - a close-up of a part that was out of focus direct light || diffuse light.