They concluded that the most likely explanation for historical incidents was a misidentification of " B . torosus " with " S . luridus ", though they could not rule out " S . luridus " containing a hitherto unidentified compound causing alcohol-related reactions.
22.
The Chinese species " Neoboletus sinensis ", originally described as a form of " S . luridus ", can be most reliably distinguished from the latter by its larger spores, which have been reported to be as large as 12 17 by 5.5 7 ?m.
23.
Genetic analysis published in 2013 shows that " B . luridus " and many ( but not all ) red-pored boletes are part of a " dupainii " clade ( named for " Boletus dupainii " ), well-removed from the core group of " Boletus edulis " and relatives within the Boletineae.
24.
A 1982 report of three cases from Switzerland further incriminated the species, yet a 1994 study casts doubt on this; researchers Ulrich Kiwitt and Hartmut Laatsch looked for antabuse-like compound coprine content in " S . luridus " and similar species, and found none in the historical suspect but did find indications for it in the rare " B . torosus ".
25.
Initially collected in Michigan under oak, " Boletus vinaceobasis " resembles " S . luridus " but has shorter spores and its cystidia are dark brown in Melzer's reagent . " Boletus " species that share a similar appearance with " S . luridus " but lack reticulation in their stems include " B . hypocarycinus " ( United States ).
26.
Initially collected in Michigan under oak, " Boletus vinaceobasis " resembles " S . luridus " but has shorter spores and its cystidia are dark brown in Melzer's reagent . " Boletus " species that share a similar appearance with " S . luridus " but lack reticulation in their stems include " B . hypocarycinus " ( United States ).
