Symbiotic relationships include parasitism (an example of parasite Wuchereria bancrofti), mutualism and commensalism as stated earlier in nutrition Russula emetica has a mutualistic relationship mycorhizae. By giving some of of the sugar it gets from photosynthesis a plant in a mutual relationship with Russula emetica will in return nitrogen, phosphorous and better water absorption. Up to 90% of all plant types have some kind of mycorhizal relationship with a fungus. It is often seen as abnormal if a plant doesn't have this relationship occurring and can be a sign of disease.


Effects on humans:

If a person is to come across the R. emetica and try to eat the mushroom he/she will encounter a peppery taste, as it is one of the hottest of the fungi. It is highly recommended that you spit out the mushroom after initial tasting. Though if you do end up swallowing it you will begin to understand why the R. emetica has earned itself the nick name the vomiting Russula, as you will almost surely throw up. Onset of symptoms can take 30 minutes to a few hours  and after symptoms appear they can  disappear suddenly upon expulsion of the mushroom from the stomach or they could last up to a few days. While R. emetica is very unlikely to kill you unlike the deadly pathogenic fungus Aspergillus fumigatus. I would still heavily advise against ever trying to consume this mushroom.
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