[Mycology] Re: truffles

[ram]

>
> Finally, hundreds if not thousands of mycorrhizal fungi can be present
> on the same roots of a tree currently fruiting truffles. A tree
> planted outside often has up to 7 mycorrhizal fungi per 1/2 centimeter
> of rootlet. To limit  colonization to only Tuber species may be
> counter-indicated for truffle production in the long-term.
>
> Daniel B. Wheeler

Are you saying that for succesful colonization, it would be neccessary
to innoculate not only with Tuber species, but with other species that
are normally found in conjuction with Tuber sp. ?  Why would this be
so?  Are the different species of fungi forming symbiotic
relationships with one another as well as with the rootlets of the
tree?