Schizopora phellinoides – synoniem of Schizopora flavipora
Sclerotinia tuberosa – synoniem of Dumontinia tuberosa
Sepultaria sumneriana – synoniem of Geopora sumneriana
Sepultaria tenuis – synoniem of Geopora tenuis
Sowerbyella unicolor – synoniem of Sowerbyella imperialis
Spongiporus leucomallellus – synoniem of Oligoporus leucomallellus
Stereum rameale – synoniem of Stereum ochraceoflavum
Strobilomyces flocculosus – synoniem of Strobilomyces strobilaceus
Stropharia aeruginosa – synoniem of Psilocybe aeruginosa
Stropharia aurantiaca – synoniem of Psilocybe aurantiaca
Stropharia coronilla – synoniem of Psilocybe coronilla
Stropharia cyanea – synoniem of Psilocybe caerulea
Stropharia inuncta – synoniem of Psilocybe inuncta
Stropharia percevalii – synoniem of Psilocybe percevalii
Stropharia rugosoannulata – synoniem of Psilocybe rugosoannulata
Stropharia semiglobata – synoniem of Psilocybe semiglobata
Stropharia squamosa – synoniem of Psilocybe squamosa