Volvariella spp, morphogenesis

[fungomorph at pi.net]

I am studying morphogenesis of fruit bodies of agaricus bisporus. The universal 
veil plays an important role in this process. I think volvariella spp can best 
be used for comparative purposes on that subject. My question is therefore :
- Has somebody his/her own experience on the morphogenesis of Volvariella spp?
- Any suggestion of info will be appreciated. TIA.