Lactarius subdulcis, commonly known as the mild milkcap or beech milk cap, is an edible mushroom in the genus Lactarius. It is brown in colour, with a large number of gills and a particularly thin layer of flesh in the cap.

Mycorrhizal, the mushroom is found from late summer to late autumn at the base of beech trees in small groups or individually, where it is one of the two most common species of fungi. Alternatively, it can be found in large groups in fields, sometimes with more than a hundred individual mushrooms. It is found in Europe, and, despite previous research to the contrary, is absent in North America.

Although considered edible, it is not particularly useful as food due to its ivy-like taste and the fact that more choice mushrooms will be easily found at the same time. L. subdulcis is known for its abundant, sweet-tasting milk that, unlike the latex of some of its relatives, does not stain fabric yellow.

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