▁stem ▁is ▁ ▁long ▁by ▁ ▁thick ▁and ▁yellow ▁to ▁yellow - b rown , ▁becoming ▁re dd ish - b rown ▁to ▁orange - b rown ▁in ▁the ▁bottom ▁half ▁in ▁m atur ity . ▁The ▁lower ▁portion ▁of ▁young ▁st ems ▁is ▁covered ▁with ▁white ▁fle cks . ▁R ough ly ▁equal ▁in ▁thick ness ▁at ▁the ▁top ▁and ▁bottom , ▁the ▁base ▁of ▁the ▁stem ▁is ▁covered ▁by ▁a ▁yellow ish ▁my cel ium ▁that ▁can ▁be ▁up ▁to ▁a ▁third ▁of ▁the ▁length ▁of ▁the ▁stem . ▁ ▁The ▁ed ibility ▁of ▁the ▁m ush room ▁is ▁" d ou bt ful " ▁and ▁consumption ▁" best ▁avoided ". ▁ ▁Micro scop ic ▁characteristics ▁The ▁sp ores ▁are ▁ 7 – 9 ▁by ▁ 5 – 6 . 5   μ m , ▁broad ly ▁elli ps oid , ▁smooth , ▁and ▁strongly ▁am y lo id ▁( it ▁turns ▁black ▁when ▁treated ▁with ▁Mel zer ' s ▁re agent ). ▁The ▁bas idia ▁( sp ore - b ear ing ▁cells ) ▁are ▁four - sp ored . ▁The ▁ple uro c yst idia ▁( c yst idia ▁on ▁the ▁g ill ▁face ) ▁are ▁not ▁differenti ated . ▁The ▁che il oc yst idia ▁( c yst idia ▁on ▁the ▁g ill ▁edge ) ▁are ▁embedded ▁in ▁the ▁g ill ▁edge ▁and ▁very ▁incon sp ic uous , ▁club - sh aped , ▁ 2 6 – 3 6 ▁by ▁ 5 – 1 0   μ