Lactarius quietus (commonly known as the oak milkcap, oakbug milkcap or southern milkcap) is a mushroom of the genus Lactarius. It is easily identified by its oily scent and the concentric bands on its cap. It is brown, and is probably named after its matt, "quiet" surface and colouration. It is found exclusively under oak trees in Europe, where it grows solitarily or in scattered groups in autumn months. In North America, the variety L. quietus var. incanus is fairly common in the same habitat. The mushroom's edibility is disputed. Taxonomy and naming Lactarius quietus was first described and named by Swedish mycologist Elias Magnus Fries, who named it Agaricus quietus in the first volume of his Systema Mycologicum, published in 1821. In his later Epicrisis Systematis Mycologici, published in 1838, Fries transferred the species to Lactarius. Subsequent attempts to reclassify the species were unsuccessful; in 1871, Paul Kummer described the species as a member of Galorrheus, and in 1891 Otto Kuntze classified it as Lactifluus, but today Fries's placement of the species in Lactarius is accepted. The specific epithet quietus means "quiet" or "calm", and is possibly used to refer to the unintrusive colours of the cap. The variety Lactarius quietus var. unicolor was described by Fries in the second volume of his Monographia Hymenomycetum Sueciae, published in 1863. The variety Lactarius quietus var. incanus was described by Lexemuel Ray Hesler and Alexander H. Smith in their 1979 North American species of Lactarius. The name incanus translates as :hoary", referring to the whited bloom which can sometimes be seen on the mushrooms. Lactarius quietus is known by the common names oak milkcap, oakbug milkcap and the southern milkcap. Lactarius quietus var. incanus is commonly known as the burnt sugar lactarius. Description Lactarius quietus typically has a convex cap of across, which later flattens or develops a small depression in the centre. In colour, the cap is a dull reddish brown with a tint of cinnamon, sometimes with darker concentric bands or spots. This zoning is one of the most distinctive features of the species. The cap is dry and matt, and not sticky when moist. It features a thick layer of firm, whitish-buff flesh. The stem measures from in height, and is typically thick. It is cylindrical in shape, but is sometimes furrowed lengthways, and it lacks a ring. It is concolorous with the cap, or a little darker,