Stalked puffball-in-aspic 
Steccherinum bourdotii 
Steccherinum oreophilum 
Steel blue rozites 
Stereum fasciatum 
Stereum lobatum 
Stereum rameale 
Stereum subtomentosum 
Stereum versicolor 
Stinking Dapperling 
Stinking Earthfan 
Stinky squid 
Stocking Webcap 
Straight-stalked Entoloma 
Strobilurus trullisatus 
Stropharia hardii 
Stubby brittlegill 
Stubby-stalk 
Stump fairy helmet mushroom 
Subalpine waxycap 
Suillus caerulescens 
Suillus cavipes 
Suillus collinitus 
Suillus cothurnatus