The genus Lactarius belongs to the Russulaceae family, which is characterised by its members having a brittle texture. Lactarius spp are distinguished from Russulas by the oozing of a white latex or "milk" from their flesh when cut or damaged.
Lactarius clarkei

Found growing under Nothofagus.

This image shows the milky latex forming where the tissue of the Lactarius has been damaged.
Lactarius tawai.

Found growing under Nothofagus

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