Bumpy beech tree - are they burls or parasitic?

Bumpy beech tree - are they burls or parasitic?

Observation - Bumpy beech tree - are they burls or parasitic? - UK and Ireland. Description: Quite an amazing sight - dozens of rounded bumps on the trunk of this beech (plus a couple of bracket fungus, if you look closely). I'm curious about all those lumps.

Quite an amazing sight - dozens of rounded bumps on the trunk of this beech (plus a couple of bracket fungus, if you look closely). I'm curious about all those lumps.