Leptolyngbya sp.

The Polar Urals Mountains. Sidyayambtoso river valley. On the dry wall of north exposure rock.

Ruskeala mountain park. Underground part, west tunnel, on the wet marble wall. Artificial light.

Ruskeala mountain park. Underground part, west tunnel, on the wet marble wall. Artificial light.

Ruskeala mountain park. Underground part, west tunnel, on the wet marble wall. Artificial light.

Vyborg settlement area. Granitic (rapakivi) adit, on the western exposure wall near the entrance. A dark green wet crust. The ph-value of the sidewall is 5.5.