Dry and wet lichen

Dry and wet lichen

Observation - Dry and wet lichen - UK and Ireland. Description: Yellow lichen (Xanthoria sp. – X. parietina?). The left and right hand images show respectively the lichen before and after dipping in water. My understanding is that wet lichens can appear greener because the algal component is more visible. It woul

Yellow lichen (Xanthoria sp. – X. parietina?).
The left and right hand images show respectively the lichen before and after dipping in water. My understanding is that wet lichens can appear greener because the algal component is more visible. It would be interesting to know if this is true of all lichens.