We are told this might be a possible Trentephohlia species: apparently a genus of Filamentous Chlorophyte Green Algae living free on Supports such as Tree Trunks (as here on Bostall Heath, the Royal Borough of Greenwich) or symbiotically in Lichens (not that that actually means anything to us!). It seems that the Filaments of Trentephohlia have a strong Orange Colour (Brownish here) caused by the presence of large quantities of Carotenoid Pigment which mask the Green of the Chlorophyll:
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