Lactarius acris

Medium-sized Lactarius with a pileus reaching up to 8 cm in diameter. It belongs to section Plinthogali, where all species are characterized by latex that turns pinkish. The species described here differs from allied taxa in that its latex turns bright pink immediately, a feature observable even when isolated from the context.

An uncommon species fruiting from summer to late autumn in deciduous woodlands, most frequently under beech (Fagus sylvatica) on calcareous soils.

The collection studied here was found in late September, growing under Fagus sylvatica on limestone in the municipality of Amurrio (Álava).