Milky cap - Lactarius cremor
I have photographed this mushroom in October 2015. Being unable to identify it I just waited for an opportunity to discuss it with a specialist.
There are a couple of similar species Milk Caps distributed in Bulgaria: L. fulvissimus, L. ichoratus, L. cremor and L. rostratus.
The fact that I found this specimen in a beech forest was determining forward the last two species.
There are some scientific debates however concerning L. cremor and L. rostratus. While MycoBank, Index Fungorum and Catalogue of Life consider them as separate species, some other sources consider them as synonyms of one species. Even more, Heilman-Clausen, et al. who described L. rostratus consider the name L. cremor to be nomen dubium.
In any way from my point of view L. rostratus or L. cremor is one and the same, as they cannot be distinguished based on a photography.
Unfortunately the link below contains space between Lactarius and cremor and it brakes here! URL encoding replaces it with "percent 20" as the space is outside the ASCII set, but this cannot be pasted here.