According to wikipedia, and it includes portobello, cremini, and white button mushrooms. I hope you enjoyed learning something about the pizza mushroom today. Primordia or “pins” are knots of mycelium that eventually develop into mushrooms (figure to the left). Remove the paper and check on your mushrooms. Portobello mushrooms (also referred to as portabello and portobella) are simply the fully mature version of cremini mushrooms. The naturally dark cap ranges in color from light tan to brown.
Comments: portobello mushroom vs shiitake mushroom
Nutrition and health benefits
Very helpful pictures to help with identification. Portabellas are 3-7 days older than crimini mushrooms when harvested. One cup of diced portobello, which equals about one mushroom, has 19 calories, 2 grams of protein and 3 grams of total carbohydrates.