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Pyrenula nitidella

A rare species almost exclusively found on the trunks of old ash trees, in late successional forests. Red-listed as endangered (EN) in Sweden. 

Pyrenula nitidella
Pyrenula nitidella on the trunk of an old ash tree, Kullaberg (Sweden). Photo: Lars Salomon.
Pyrenula nitidella
Pyrenula nitidella on the trunk of an old ash tree, Kullaberg (Sweden). Photo: Lars Salomon.
Fraxinus excelsior
Old ash tree with relatively smooth bark. Pyrenula nitidella is growing on the right side of the trunk, near the base. Kullaberg (Sweden). Photo: Lars Salomon.