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I can't still finish Kill venusian mushroom traps and one more related quest (I forget the name, it was given by a mushroom too).
Away for Labor Day holiday. Can try to help you Tuesday when I'm back.
You need Weed Killer to kill the Venusian Mushroom Traps. Weed killer is there in water behind tappable and crackable walls in the mid area in Home of the Boletus Folk.
For the other quest, you might mean this quest--"For the Head Boletus, Home of the Boletus Folk, bring him some Elixir of Spore." You need Elixir of Spore that is also in that same area.