Scientific name:Lactarius acris (Bolton) Gray 1821 Synonyms:Species Fungorum 18.06.2015: Agaricus acris Bolton 1788 Agaricus acris [unranked] alneti (Krapf) Pers. 1801 Agaricus acris var. acris Bull. 1792 Agaricus acris var. fuligineus Alb. & Schwein. 1805 Agaricus acris var. lividorubescens Alb. & Schwein. 1805 Agaricus alneti Krapf 1782 Galorrheus acris (Bolton) P. Kumm. 1871 Lactarius acris var. acris (Bolton) Gray 1821 Lactifluus acris (Bolton) Roussel 1806 Habit of Growth:
Mushroom is not protected Trees: Carpinus (Hornbeam)d0d0d0d0
, Fagus (Beech)d1d1d1d1d1
Cap: 5-8 cm across, young flattened convex, later flattened und dented in the center, wavy, smooth surface, shiny and slippery when wet, matt when dry, pale grey beige to chestnut brown, with olive tint, margin smooth to crenate.
Hymenophore: young are lamellae cream, later pale ocher yellow, broad and slightly decurrent, several times forked.
Spore print: pale yellow
Spore: globose to subglobose, 7-8,7 x 6,6-8,1 μm, ornament, with warts and ribs, which are net like connected for several times.
Stem: 3-7 x 0,5-2 cm, cylindrical, base little thinner, full, smooth surface, first white and pruinose, later glabrous and ocher to pink staining.
Flesh: white, if cut within few seconds pink, odor little unpleasant, taste acrid. Milk: white, within few seconds pink, acrid.
Habitat: mostly grouped by beech, on base rich, but nitrogen poor, moist soils, grows from summer to fall.
Remarks: the only Lactarius with white milk, which changes after few sekundes in pink.