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Hydnum repandum, commonly known as the sweet tooth, wood hedgehog or hedgehog mushroom, is an edible mushroom with no poisonous lookalikes. A basidiomycete fungus of the family Hydnaceae, it is the type species of the genus Hydnum. The fungus produces fruit bodies (mushrooms) that are characterized by their spore-bearing structures—in the form of spines rather than gills—which hang down from the underside of the cap. The cap is dry, colored yellow to light orange to brown, and often develops an irregular shape, especially when it has grown closely crowded with adjacent fruit bodies. The mushroom tissue is white with a pleasant odor and a spicy or bitter taste. All parts of the mushroom stain orange with age or when bruised.
A mycorrhizal fungus, Hydnum repandum is broadly distributed in Europe, Asia and western North America where it fruits singly or in close groups in coniferous or deciduous woodland. This is a choice edible species, although mature specimens can develop a bitter taste. Mushrooms are collected and sold in local markets of Europe and Canada.
Hydnum repandum is frequently sold with chanterelles in Italy, and in France, it is one of the officially recognized edible species sold in markets. In Europe, it is usually sold under its French name Pied-de-Mouton (Sheep's Foot). H. repandum mushrooms are also used as a food source by the red squirrel (Sciurus vulgaris)
North American lookalikes include the white hedgehog (Hydnum albidum) and the giant hedgehog (Hydnum albomagnum). H. albidum has a white to pale yellowish grey fruit body that bruises yellow to orange. H. albomagnum is large and paler than H. repandum. Hydnum umbilicatum is smaller, with caps measuring 3–5 cm (1.2–2.0 in) in diameter, and thinner stipes that are 0.5–1 cm (0.2–0.4 in) wide. Its caps are umbilicate (with a navel-like cavity), sometimes with a hole in the center of the cap, unlike the flattened or slightly depressed caps of H. repandum.Microscopically, H. umbilicatum has spores that are larger and more elliptical than those of H. repandum, measuring 7.5–9 by 6–7.5 µm. A European lookalike, Hydnum rufescens, is also smaller than H. repandum, and has a deeper apricot to orange color. Hydnum ellipsosporum, described as a new species from Germany in 2004, differs from H. repandum by the shape and length of its spores, which are ellipsoid and measure 9–11 by 6–7.5 µm. Compared to H. repandum, it has smaller fruit bodies, with cap diameters ranging from 3 to 5 cm (1.2 to 2.0 in) wide