Mushrooms And Fungi Of Any Kind

The strangest thing I found today! First noticed the small (~10cm) "marshmallows" on the first photo and after that the 40-50 cm stuff on the second photo. All these on branches (80-100 cm in diameter) of a big tree in botanical garden. In generally about 6-7 meters above the ground (On the photos! Some were higher). It looks like a spray foam but it could be also fungus or a slime mold and that is the reason I post it here. Very perplexing, obviously I have to go back and talk with gardeners or supervisor!!!

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It still could be polyurethane! I have to talk with the personnel of the botanical garden. This things are so high on the tree, I can't take a sample...
Arborists sometimes use this sort of thing to fill holes etc in damaged trees that could otherwise lead to borers etc getting in. Maybe that's it. I immediately thought of slime mould too - but it doesn't look like it in close-up!
 
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Arborists sometimes use this sort of thing to fill holes etc in damaged trees that could otherwise lead to borers etc getting in. Maybe that's it. I immediately thought of slime mould too - but it doesn't look like it in close-up!
Problem solved: I took a trip to the same garden and talk with the only gardener that was present - it's a PU spray! They used it to prevent the bees to make a nests on that tree (it has happened in the past resulting in some problems for the visitors/stuff ;)). Took some fast photos when cursing the garden in search for a gardener.

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?!: it looks Like a Lactarius (Milchling) but isn't it so early? ...
Thanks once again, ISv, for sharing your knowledge.
That is an old photo from back in November. I have a long backlog of photos I haven't processed yet.
Being out, enjoying nature is more to me than sitting in front of a monitor, processing photos I've taken.
 
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