Thank you Steve, for the reference source. I was unaware that there was such a source, I usually struggle through the reference books that I've collected over the years but I could not find this species in that linked source either. I cannot find a labelled example of a Boletus with that distinctive, parted, stipe skin. Thanks Colin You could also try Mushrooms and other Fungi by Roger Philli ...

A very good composition. I like it a lot.