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Multiclavula mucida
Also called club lichen. The white part is a fungus that always grows in algae, making it a lichen. And it looks like there's some moss thrown in for good measure too.
log in woods
There looks to be a few different things going on here. There is moss, but it is intermittent.. That green slime is most likely an algae. The white little clubs are a fungus called White Green-algae Coral (Multiclavula mucida)