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Could it be just mud with iron bacteria that’s dripped on the tree?
Agree. Its almost certainly mud.
That might be it, this photo was taken near a river bank where there are streams of slow running water
https://en.m.wikipedia.org/wiki/Iron-oxidizing_bacteria
The shade of orange is pretty distinct I think.
The dude from primitive technology is going to make that into a knife
Looks like a slime mold of some kind.
Can a slime mold be this big?
A quick Google search said up to 30 square meters.
tree
yea but I meant the orange thing
Orange tree
It looks like a strangler fig with some orange mud on it.
You might get an informed answer if you upload it to https://www.inaturalist.org/, provided you can tell them where the photo was taken