nigricans including classification and history,significance of it,how it relates to science,environment,or health? Is Russula Subnigricans pathogenic?…

Detail notes of Russula Subnigricans including classification and history,significance of it,how it relates to science,environment,or health?
Is Russula Subnigricans pathogenic?,What does it cause and what is the treatment?,Who does it affect,what part of the world is it found.
What makes this species unique and interesting?
Please add reference to this question
 
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