On Tue, 09 Jul 2013 12:40:40 -0400, James Silverton
> wrote:

> Packages of porcini and regular white mush rooms seem to sell for much
> the same price in the markets I use. Isn't a portobello just a fully
> grown porcini?

I thought portobello is a full grown crimini mushroom although this
web site says differently.
http://www.thekitchn.com/what-are-cr...ooms-a-f-73949

This one agrees with me
http://www.drgourmet.com/ingredients/mushrooms.shtml
The writer says s/he purchases dried porcini from a bulk bin, but I've
never seen them sold that way.

--
Food is an important part of a balanced diet.