Parmelia sp?

Parmelia sp?

Observation - Parmelia sp?. Description: Growing on a plum tree; on the older part of the thallus there are, I think, soredia looking rather like a crust; the lobes are blue-grey on top with black rhizines beneath, but too small for me to see their shape clearly. Picture 1 taken on a bright, sun

Growing on a plum tree; on the older part of the thallus there are, I think, soredia looking rather like a crust; the lobes are blue-grey on top with black rhizines beneath, but too small for me to see their shape clearly. Picture 1 taken on a bright, sunny day. Picture 2 on a rainy day.