Sagedia Sagedia zonata Sarcogyne Sarcogyne clavus Sarcogyne privigna - GB collections are Sarcogyne hypophaea Sarcogyne regularis Sarcopyrenia Sarcopyrenia gibba Schaereria Schaereria cinereorufa Schaereria fuscocinerea Schismatomma Schismatomma decolorans - see Dendrographa decolorans Schismatomma niveum - see Snippocia nivea Schismatomma quercicola - see Schizotrema quercicola Schizotrema Schizotrema quercicola Sclerococcum Sclerococcum griseisporodochium Sclerophora Sclerophora farinacea Sclerophora pallida Sclerophora peronella Scoliciosporum Scoliciosporum chlorococcum Scoliciosporum curvatum Scoliciosporum intrusum - see Micarea intrusa Scoliciosporum pruinosum Scoliciosporum sarothamni Scoliciosporum umbrinum Scytinium Scytinium biatorinum Scytinium fragrans Scytinium lichenoides Scytinium magnussonii Scytinium palmatum Scytinium pulvinatum Scytinium subtile Scytinium teretiusculum Scytinium turgidum Siphula Siphula ceratites Solenopsora Solenopsora candicans Solenopsora holophaea Solenopsora liparina Solenopsora vulturiensis Solitaria Solitaria chrysophthalma Solorina Solorina saccata Sphaerophorus Sphaerophorus fragilis Sphaerophorus globosus Sporodictyon Sporodictyon cruentum Sporodictyon schaererianum Sporodictyon terrestre Squamarina Squamarina cartilaginea Staurothele Staurothele succedens Stenocybe Stenocybe pullulata Stenocybe septata Stereocaulon Stereocaulon condensatum Stereocaulon dactylophyllum Stereocaulon delisei Stereocaulon evolutum Stereocaulon leucophaeopsis Stereocaulon pileatum Stereocaulon vesuvianum Sticta key Sticta atlantica Sticta canariensis Sticta ciliata Sticta fuliginoides Sticta fuliginosa Sticta limbata Sticta sylvatica Strangospora Strangospora pinicola Strigula Strigula calcarea - see Swinscowia calcarea Strigula jamesii - see Swinscowia jamesii Strigula tagananae - see Swinscowia tagananae Strigula taylorii - see Dichoporis taylorii Swinscowia Swinscowia calcarea Swinscowia jamesii Swinscowia tagananae Syncesia Syncesia myrticola