Russula nigricans (Bull.) Fr. (1838)                                                       *Collections: North America

Russula nigricans is one of the most notable species of the Genus due to its color changes. There is a strong red reaction upon bruising, which later changes to black. There is a similar species in Western North America Russula dissimulans, which differs by having distinctly larger spores, something that I personally had a chance to note when comparing. The spore range for nigricans, as given in Sarnari's excellent monograph would encompass dissimulans as well, but upon examining the material one can clearly see that they fall in two different groups based on spore size averages.

Spores 5-8 x 5-7