I'm indicating "I don't know" if it's true or not.  In short, I'm sitting on the fence - it might be true, it might not be.

Trump lies as it suits him, and has motive to lie as it would make him look better.  Comey's actions regarding leaks and other actions show him hostile toward Trump, a motive to lie to politically harm the president.

Atop the motive, I have a hard time believing that Comey was so intimidated by Donald Trump he sat in the Oval Office gobsmacked and was too petrified to follow up in any way aside from writing a memo to himself.  

In short, his account of the meeting doesn't mesh.

But I suppose it's possible it happened as Comey said - for the reasons PhilCO3 put out - and in my view, if that was the case, Comey would have been incompetent.