Claim: Gymnopilus naucorioides is a species of mushroom, with a cap of two to five centimetres, which grows on hemlock (aka Tsuga)which is a conifer that is perceived to smell like the unrelated poison hemlock.
Evidence: Gymnopilus naucorioides is a species of mushroom in the family Cortinariaceae. The cap is 2 to 5 centimetres (0.8 to 2.0 in) in diameter. Gymnopilus naucorioides grows on hemlock. Tsuga (/ˈsuːɡə/, from Japanese 栂 (ツガ), the name of Tsuga sieboldii) is a genus of conifers in the subfamily Abietoideae. The common name hemlock (tree) is derived from a perceived similarity in the smell of its crushed foliage to that of the unrelated plant poison hemlock.