Скачать или смотреть A Brittlegill that gets reddish (Russula acrifolia or Russula densifolia?)

This blushing Brittlegill looks a lot like a Lactarius but it don't exudes any latex. This is an interesting Russula that turns reddish on bruising, and later on it gets blackish-gray. I've tried a few drops of KOH on the cap and on the flesh of the stem, the result was a deep black color in the affected areas. Its flesh also got reddish on cutting. I've read that Russula acrifolia and densifolia are "edible but mediocre" but I've read also that they are inedible. So, I will not try to eat it. I nibbled its gills, they taste very hot.
I have initially considered this specimen to be Hotlips Brittlegill (Russula acrifolia), however after checking it at the microscope some doubts remain. I still think is most probably acrifolia, but there are at least two other species that can be hard to tell apart: Russula densifolia and Russula adusta.
Previously I had ruled out R.densifolia because some sources say that the gills don't taste hot (but there are some sources that say that it can also taste hot) and the fact that some consider that densifolia cap is up to 8 cm in diameter - mine was bigger (but there are also authors saying that densifolia can reach 15 cm). Acrifolia is supposed to be a more robust species than densifolia. And there is also R.adusta that is a species even bigger than acrifolia, that doesn't get so reddish when cut, and is not hot, so I would rule it out. Its habitat is with pines though.
Some say that acrifolia is found with broad-leaved trees, but others say that it can be found with coniferous as well.
All this three species have the size of the spores very identical. They have some differences in terms of the pileipellis (densifolia has inflated elements but no pileocystidia; acrifolia has pileocystidia).

Another common name for Russula acrifolia and densifolia is Crowded Brittlegil (maybe because these two species have crowded gills, wereas another somehow similar Russula, R. nigricans has them widely spaced).

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