River jelly lichen  (Collema dichotomum)

Facts

Kingdom Fungi
Phylum Ascomycota
Class Acosmycetes
Order Lecanorales
Family Collemataceae
Genus Collema
Size Patch diameter: usually up to 25 mm.
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Status

Classified as Vulnerable in the UK, and protected under Schedule 8 of the Wildlife and Countryside Act (1981) as amended.