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Finnish word leppärousku comes from Finnish leppä, Finnish rousku (A milk-cap (mushroom of the genus Lactarius).)
leppä (Finnish)
A grey alder (harmaaleppä by its full Finnish name), Alnus incana.. An alder, any of the trees in the genus Alnus.
rousku (Finnish)
A milk-cap (mushroom of the genus Lactarius).
leppärousku (Finnish)
Either of the two species of milk-caps (Lactarius deterrimus, Lactarius deliciosus).