"Nick Maclaren" wrote in message I had been under the impression that different plants
associated with different fungi, yet this seems to indicate
that they're not that fussy. Who's right?

Well, up until the invention of Myke, you were.

Think about it this way. If some genius biotechnicians had developed
a generic and universally beneficial form of mycorrhiza, do you think
that they would advertise it on uk.rec.gardening? The terms Tono Bungay
and Snake Oil spring to mind.

Why is it easier to sell magic than to sell science? It's a very old question that badly needs addressing.

Rod