OK why doesn't this appear in Phillips/Collins? Have I missed something obvious somewhere.
I took the above shot yesterday and tried to find it in the two books I have but there was no reference to it. A quick google pointed me in the right direction and it appears that this is common. Funnily enough google led me to WAB and a picture by FungiJohn.
I realise that it is difficult to cover everything in a book but it did leave me wondering.
JohnB