Russula heterophylla  (Fr.) Fr. (1838)

This is one of the classic Russula species, which is at the center of an entire Section that was erected around it  -- Heterophyllidia Romagnesi.  The Section consists of many similar  mild, greenish species, which generally have white to pale spore print and low spore ornamentation.

Spores: 6-7 x 4.2-6, low ornamentation, few ridges.