DR. Mushrooms `s  Milky mushroom  is pure white from base to cap with a thick meaty stem and a solid disc-like top. The caps resemble those of button mushrooms and can range from dome-shaped to nearly convex with maturity. Beneath the cap are pale gills. Milky mushrooms do not lose their name-sake color, and do not bruise or discolor with age or handling. The milky white mushrooms offer flavors similar to that of button mushrooms with a tender yet pleasantly chewy texture.