They are not. The stems are a lighter color tan on cubensis, and also bruise blue. Also the caps are too large to be cubensis. They look very close other than that though.
Drugman Joe Reviewed by Drugman Joe on . IS THIS P. CUBENSIS? (mushrooms) I found these growing near my house. I was thinking they were p. cubensis but one thing throws the description off. The stem is not as white as the cap and is really not white at all. But if anyone is experienced in mycology i would appreciate some advice. Rating: 5