Most mushrooms sold in supermarkets have been commercially grown on mushroom farms. The most popular of these, "Agaricus bisporus", is considered safe for most people to eat because it is grown in controlled, sterilized environments. Several varieties of "A. bisporus" are grown commercially, including whites, crimini, and portobello. Other cultivated species available at many grocers include "Hericium erinaceus", shiitake, maitake (hen-of-the-woods), "Pleurotus", and enoki. In recent years, increasing affluence in developing countries has led to a considerable growth in interest in mushroom cultivation, which is now seen as a potentially important economic activity for small farmers.