A dark brown, slightly firmer variation of the everyday cultivated white mushroom. Cremini have a slightly fuller flavor than their paler relatives. They have a smooth rounded cap that ranges in size from ½ to 2 inches in diameter. The portobello mushroom is the fully matured form of this mushroom. The cremino is also referred to as common brown mushroom and Roman mushroom.
From The Food Lover's Companion, Fourth edition by Sharon Tyler Herbst and Ron Herbst. Copyright © 2007, 2001, 1995, 1990 by Barron's Educational Series, Inc.