Lichen Taxa held in MSC
| Genus | Species | N | MI | WI | S | Aus | E | Af | As | Notes | ||
| Sagediopsis | barbara | . | . | . | . | . | E | . | . | |||
| Sagenidium | molle | . | . | . | . | Aus | . | . | . | |||
| Sagiolechia | protuberans | . | . | . | . | . | E | . | . | |||
| Santessoniella | polychidioides | . | . | . | S | . | . | . | . | |||
| Sarcographa | dilatescens | . | . | WI | . | . | . | . | . | |||
| Sarcographa | heteroclitia | . | . | WI | . | . | . | . | As | |||
| Sarcographa | intricans | . | . | . | S | . | . | . | . | |||
| Sarcographa | tricosa | N | . | WI | . | . | . | . | . | |||
| Sarcogyne | clavus | N | . | . | . | . | E | . | . | |||
| Sarcogyne | oligospora | N | . | . | . | . | . | . | . | |||
| Sarcogyne | privigna | N | . | . | . | . | . | . | . | |||
| Sarcogyne | regularis | N | MI | . | . | . | E | . | . | |||
| Sarcosagium | campestre | N | . | . | . | . | . | . | . | |||
| Sarea | difformis | . | MI | . | . | . | . | . | . | |||
| Sarea | resinae | N | MI | . | . | . | . | . | . | |||
| Sarrameana | cyamidia | . | . | . | . | Aus | . | . | . | |||
| Schadonia | fecunda | N | . | . | . | . | . | . | . | |||
| Schaereria | cinereorufa | . | . | . | . | . | E | . | . | |||
| Schaereria | fuscocinerea | N | . | . | . | . | E | . | . | |||
| Schaereria | porpidioides | . | . | . | S | . | . | . | . | |||
| Schismatomma | accedens | . | . | . | S | . | . | . | . | |||
| Schismatomma | decolorans | . | . | . | . | . | E | . | . | |||
| Schismatomma | diplotommoides | . | . | . | . | . | E | . | . | |||
| Schismatomma | graphidioides | . | . | . | . | . | E | . | . | |||
| Schismatomma | lurida | N | . | . | . | . | . | . | . | |||
| Schismatomma | picconeana | . | . | . | . | . | E | . | . | |||
| Schismatomma | rappii | N | . | . | . | . | . | . | . | |||
| Schistophoron | tenue | . | . | . | S | . | . | Af | . | |||
| Schizopelte | califronicum | N | . | . | . | . | . | . | . | |||
| Sclerophora | nivea | N | MI | . | . | . | . | . | ||||
| Sclerophyton | californicum | N | . | . | . | . | . | . | . | |||
| Sclerophyton | circumscriptum | . | . | . | . | . | E | . | . | |||
| Sclerophyton | evansesens | var | elegans | . | . | WI | . | . | . | . | . | |
| Sclerophyton | inscriptum | N | . | . | . | . | . | . | . | |||
| Scoliciosporum | chlorococcum | N | MI | . | . | . | E | . | . | |||
| Scoliciosporum | umbrinum | N | MI | . | . | . | . | . | . | |||
| Scutula | miliaris | . | . | . | . | . | E | . | . | lichenicolous | ||
| Scutula | miliaris | var. | epigaea | . | . | . | . | . | E | . | . | lichenicolous |
| Scutula | solorinaria | . | . | . | . | . | E | . | . | lichenicolous | ||
| Segestria | leptalea | N | . | . | S | . | E | . | . | |||
| Segestria | mammillosa | . | . | . | . | . | E | . | . | |||
| Sigridia | californica | N | . | . | . | . | . | . | . | |||
| Siphula | caracassana | . | . | . | S | . | . | . | . | |||
| Siphula | ceratites | N | . | . | . | . | E | . | . | |||
| Siphula | complanata | . | . | . | S | . | . | . | . | |||
| Siphula | coriacea | . | . | . | . | Aus | . | . | . | |||
| Siphula | decumbens | . | . | . | . | Aus | . | . | . | |||
| Siphula | dissoluta | . | . | . | . | Aus | . | . | . | |||
| Siphula | fastigiata | . | . | WI | S | . | . | . | . | |||
| Siphula | fragilis | . | . | . | . | Aus | . | . | . | |||
| Siphula | moori (ae) | . | . | . | . | Aus | . | . | . | |||
| Siphula | obtusula | . | . | . | S | . | . | . | . | |||
| Siphula | polyschids | N | . | . | . | . | . | . | . | |||
| Siphula | rocelliformis | . | . | . | . | Aus | . | . | . | |||
| Siphulastrum | mamillatum | . | . | . | . | Aus | . | . | . | |||
| Siphulastrum | triste | . | . | . | . | Aus | . | . | . | |||
| Siphulella | coralloides | . | . | . | . | Aus | . | . | . | |||
| Skyttea | nitschkei | . | . | . | . | . | E | . | . | lichenicolous | ||
| Solenopsora | candicans | N | . | . | . | . | E | . | . | |||
| Solenopsora | holophaea | . | . | . | . | . | E | . | . | |||
| Solenopsora | subdisparata | . | . | . | . | . | E | . | . | |||
| Solenopsora | vulturiensis | . | . | . | . | . | E | . | . | |||
| Solorina | bispora | N | . | . | . | . | . | . | . | |||
| Solorina | crocea | N | . | . | . | . | E | . | As | |||
| Solorina | octospora | N | . | . | . | . | E | . | . | |||
| Solorina | saccata | N | MI | WI | S | . | E | . | As | |||
| Solorina | simensis | . | . | . | . | . | . | . | As | |||
| Solorina | spongiosa | N | . | . | . | . | E | . | . | |||
| Speerschneidera | euploca | N | . | . | . | . | . | . | . | |||
| Sphaerophorus | fragilis | N | . | . | . | . | E | . | . | |||
| Sphaerophorus | globosus | N | . | . | S | . | E | . | . | |||
| Sphaerophorus | stereocauloides | . | . | . | . | Aus | . | . | . | |||
| Sphaerothallia | hispida | N | . | . | . | . | . | . | . | |||
| Sphinctrina | anglica | . | MI | . | . | . | . | . | . | lichenicolous | ||
| Sphinctrina | leucopoda | . | MI | . | . | . | . | . | . | lichenicolous | ||
| Sphinctrina | microcephala | . | . | . | . | . | E | . | . | lichenicolous | ||
| Sphinctrina | pedata | N | MI | . | . | . | . | . | . | lichenicolous | ||
| Sphinctrina | tubiformis | . | . | WI | . | . | . | . | . | lichenicolous | ||
| Sphinctrina | turbinata | . | . | . | . | . | E | . | . | lichenicolous | ||
| Spilomium | graphideorum | . | . | . | . | . | E | . | . | lichenicolous | ||
| Spilonema | paradoxum | N | . | . | . | . | . | . | . | |||
| Spilonema | revertens | N | . | . | . | . | . | . | . | |||
| Sporastatia | polyspora | N | . | . | . | . | . | . | . | |||
| Sporastatia | testudinea | N | . | . | . | . | . | . | . | |||
| Sporopodium | phyllocharis | N | . | . | . | . | . | . | . | |||
| Sporopodium | xantholeucum | . | . | WI | . | . | . | . | . | |||
| Squamacidia | janeirensis | var. | endococcinea | . | . | . | S | . | . | . | . | |
| Squamarina | cartilaginea | N | . | . | . | . | E | . | . | |||
| Squamarina | concrescens | . | . | . | . | . | E | . | . | |||
| Squamarina | gypsacea | . | . | . | . | . | E | . | ||||
| Squamarina | lamarkii | . | . | . | . | . | E | . | ||||
| Squamarina | lentigera | N | . | . | . | . | E | . | ||||
| Squamarina | periculosa | . | . | . | . | . | E | . | ||||
| Staurothele | areolata | N | . | . | . | . | E | . | . | |||
| Staurothele | catalepta | . | . | . | . | . | E | . | . | |||
| Staurothele | clopimoides | N | . | . | . | . | E | . | . | |||
| Staurothele | drummondii | N | MI | . | . | . | . | . | . | |||
| Staurothele | elenkinii | N | . | . | . | . | . | . | . | |||
| Staurothele | fissa | N | MI | . | . | . | E | . | . | |||
| Staurothele | guestphalica | . | . | . | . | . | E | . | . | |||
| Staurothele | monicae | N | MI | . | . | . | . | . | . | |||
| Staurothele | rufa | . | . | . | . | . | E | . | . | |||
| Staurothele | succedens | . | . | . | . | . | E | . | . | |||
| Steinera | brattii | . | . | . | . | Aus | . | . | . | |||
| Steinera | glaucella | . | . | . | . | Aus | . | . | . | |||
| Steinera | molybdoplaca | . | . | . | . | Aus | . | . | . | |||
| Steinia | geophana | N | MI | . | . | . | . | . | . | |||
| Stenocybe | major | N | MI | . | . | . | . | . | . | |||
| Stenocybe | pullatula | N | . | . | . | . | . | . | . | |||
| Stenocybe | septata | . | . | . | . | . | E | . | . | |||
| Stephanocyclos | henssenianus | . | . | . | . | Aus | . | . | . | |||
| Stereocaulon | alpinum | N | . | . | S | . | E | . | . | |||
| Stereocaulon | arcticum | N | . | . | . | . | . | . | . | |||
| Stereocaulon | arenarium | N | . | . | . | . | . | . | . | |||
| Stereocaulon | argus | . | . | . | . | Aus | . | . | . | |||
| Stereocaulon | botryosum | N | . | . | . | . | E | . | . | |||
| Stereocaulon | caespitosum | . | . | . | . | Aus | . | . | . | |||
| Stereocaulon | colensoi | . | . | . | . | Aus | . | . | . | |||
| Stereocaulon | condensatum | N | . | . | . | . | E | . | . | |||
| Stereocaulon | congestum | . | . | . | . | . | . | Af | . | |||
| Stereocaulon | coniophyllum | N | . | . | . | . | . | . | . | |||
| Stereocaulon | corallinum | . | . | . | . | . | E | . | . | |||
| Stereocaulon | cornutum | . | . | WI | S | . | . | . | . | |||
| Stereocaulon | corticulatum | . | . | . | S | Aus | . | . | . | |||
| Stereocaulon | cymosum | . | . | . | . | Aus | . | . | . | |||
| Stereocaulon | dactylophyllum | N | MI | . | . | . | E | . | . | |||
| Stereocaulon | depreaultii | N | . | . | . | . | . | . | . | |||
| Stereocaulon | dasenii | . | . | . | S | . | . | . | . | |||
| Stereocaulon | esterhuysense | . | . | . | . | . | . | Af | . | |||
| Stereocaulon | evolutum | . | . | . | . | . | E | . | . | |||
| Stereocaulon | explanatum | . | . | . | S | . | . | . | . | |||
| Stereocaulon | fronduliferum | . | . | . | . | Aus | . | . | . | |||
| Stereocaulon | furetum | . | . | WI | . | . | . | . | . | |||
| Stereocaulon | glabrum | . | . | . | S | . | . | . | . | |||
| Stereocaulon | glareosum | N | . | . | . | . | E | . | . | |||
| Stereocaulon | glaucescens | N | MI | . | . | . | . | . | . | |||
| Stereocaulon | grande | N | . | . | . | . | . | . | . | |||
| Stereocaulon | gregarium | . | . | . | . | Aus | . | . | . | |||
| Stereocaulon | groenlandicum | N | . | . | . | . | . | . | . | |||
| Stereocaulon | implexum | . | . | . | S | . | . | . | . | |||
| Stereocaulon | incrustatum | N | . | . | . | . | E | . | . | |||
| Stereocaulon | intermedium | N | . | . | . | . | . | . | . | |||
| Stereocaulon | leucophaeopsis | . | . | . | . | . | E | . | . | |||
| Stereocaulon | microcarpum | N | . | WI | S | . | . | . | As | |||
| Stereocaulon | myriocarpum | N | . | . | . | . | . | . | . | |||
| Stereocaulon | nanodes | N | . | . | . | . | E | . | . | |||
| Stereocaulon | obesum | . | . | . | S | . | . | . | . | |||
| Stereocaulon | paschale | N | MI | . | . | . | E | . | . | |||
| Stereocaulon | pileatum | N | MI | WI | . | . | . | . | . | |||
| Stereocaulon | proximum | var. | compressum | . | . | . | S | . | . | . | . | |
| Stereocaulon | ramulosum | N | . | WI | S | Aus | . | . | . | |||
| Stereocaulon | ramulosum | var. | macrocarpon | . | . | . | S | Aus | . | . | . | |
| Stereocaulon | ramulosum | var. | perpurium | . | . | WI | . | . | . | . | . | |
| Stereocaulon | ramulosum | var. | pulvinare | . | . | . | S | Aus | . | . | . | |
| Stereocaulon | rivulorum | N | . | . | . | . | E | . | . | |||
| Stereocaulon | saxatile | N | MI | . | . | . | E | . | . | |||
| Stereocaulon | spathuliferum | N | . | . | . | . | . | . | . | |||
| Stereocaulon | speciosum | var. | surreptaris | . | . | . | S | . | . | . | . | |
| Stereocaulon | sphaerophoroids | . | . | . | . | . | E | . | . | |||
| Stereocaulon | sterile | N | . | . | . | . | . | . | . | |||
| Stereocaulon | strictum | . | . | WI | . | . | . | . | . | |||
| Stereocaulon | subcoralloides | N | MI | . | . | . | . | . | . | |||
| Stereocaulon | tomentosum | . | MI | . | S | . | E | . | . | |||
| Stereocaulon | vesuvianum | N | . | . | S | . | E | . | . | |||
| Stereocaulon | vesuvianum | var. | efflorescens | . | . | WI | S | . | . | . | . | |
| Stereocaulon | vesuvianum | var. | kilmandscharoense | . | . | . | S | . | . | . | . | |
| Stereocaulon | vesuvianum | var. | obesa | . | . | . | S | . | . | . | . | |
| Stereocaulon | virgatum | . | . | WI | . | . | . | . | . | |||
| Stereocaulon | vulcani | N | . | . | . | . | . | . | . | |||
| Sticta | amphisticta | . | . | . | . | Aus | . | . | . | |||
| Sticta | antillarum | . | . | WI | . | . | . | . | . | |||
| Sticta | babingtonii | . | . | . | . | Aus | . | . | . | |||
| Sticta | beauvoisii | N | . | . | . | . | . | . | . | |||
| Sticta | calithamnia | . | . | . | S | . | . | . | . | |||
| Sticta | canariensis | N | . | W | S |