I didn’t want to dig up the examples above, as I’ve done that in the past. (One lot of rhizoids on a truffle looks much the same as another. 😆)
For those who haven’t seen what’s going on below the soil, in true Blue Peter style – “Here’s one I prepared earlier” 

[attachment=0]Cordyceps ophioglossoides (2).jpg[/attachment]
Regards,
Mike.