I doubt it. That was my first reaction anyway.
Much like this amusing summary from The Guardian, which asks why the tree looks green and healthy if it had never seen the sunlight. Good question.
Then I saw this video on the BBC website. It’s pretty gruesome in places. And sorry about the ads.
The surgeon looks convincing enough. I don’t think the Guardian’s scepticism about the reliability of non-English witnesses is fair. They really could have found a bit of fir tree in Artyom Sidorkin’s lung. But I think I am convinced by the Russian botanist, who says it is simply impossible for it to have grown there.
Impossible is a big word. But my last reaction is the same as my first. I doubt it.