This is a bright green algae with unbranched filaments. It can cause multilayered crusts to form.
It has become increasingly common on fences and similar cut timber, it also grows on the soil surface and occasionally on rocks.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015