are there any endangered species within this family?
Yes, some species of "Lactarius", "Lactifluus" and "Russula"  are endangered.
Russulaceae
 However, national lists contain some species of "Lactarius", "Lactifluus" and "Russula", indicating that they have small populations and are endangered, e.g. in Great Britain, Switzerland, the Czech Republic, and New Zealand.
what species is lactifluus volemus? It is a species of fungus in the family Russulaceae. who was the first to name and describe it? The first mention of "Lactifluus volemus" in the scientific literature was in Carl Linnaeus's 1753 "Species Plantarum", under the name "Agaricus lactifluus". can this be consumed by humans? Yes, it is edible. in the family of fungal species mentioned above, are there any species that cause decay in wooden objects? The corticioid species in "Boidinia", "Gloeopeniophorella", and "Pseudoxenasma" are saprotrophic, wood-degrading fungi that develop on dead wood.
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Russulaceae [SEP] Threats and conservation
As with most fungi, little information is available on the threat of extinction for Russulaceae species, and they have not been assessed in the International Union for the Conservation of Nature's Red List. However, national lists contain some species of "Lactarius", "Lactifluus" and "Russula", indicating that they have small populations and are endangered, e.g. in Great Britain, Switzerland, the Czech Republic, and New Zealand. Although data on Russulaceae themselves are scarce, more is known about the habitats they occur in, especially for the ectomycorrhizal species which depend on their host plants: Several of these habitats are affected by loss or degradation, such as peatlands, Mediterranean forests and scrub or tropical African dry woodland.