There is plenty of info out there… You should check Index Fungorum to see which names to look for:
And see the Pholiota, also Kuehneromyces has been seen as a section of Pholiota for many authors, so you can check Pholiota for North America info here:
And see the listing for Pholiota vernalis here:
There Smith and Hesler equate Agaricus vernalis and Agaricus lignicola, so they believe that these are the same species, and there isn’t a difference.
You can also see notes on the species here in MO, with two different obs. that have rather good notes:
That should be enough maybe?