The brown mushroom comes in 2 sizes closed cup sometimes called Chestnut and the larger “mini Portobello. We provide specific brown Casing for the commerical Mushroom growers worldwide. 

About The Brown Mushroom "Agaricus bisporus"

Brown Mushrooms are one of the best best most popular  These are not only lighter than white mushrooms, but heal more per KG spent buying them, so its not only more efficient, but more cost effective to spend the same KG on these as you would on white mushrooms. Also it's the best food obtainable in a shop. 100 brown mushrooms weigh 20 oz. and will last you 7 h 20m. Because of its low weight, they are useful for building strength in your body.