| Obelidium mucronatum |
MycoBank | / Index Fungorum | / Genbank | |
| Obolarina dryophila |
MycoBank | / Index Fungorum | / Genbank | |
| Obscurodiscus myricae |
MycoBank | / Index Fungorum | - | |
| Obtectodiscus aquaticus |
MycoBank | / Index Fungorum | - | |
| Occultifur externus |
MycoBank | / Index Fungorum | / Genbank | |
| Ochrocladosporium elatum |
MycoBank | / Index Fungorum | - | |
| Ochrocladosporium frigidarii |
MycoBank | / Index Fungorum | / Genbank | |
| Ochroconis anellii |
MycoBank | / Index Fungorum | - | |
| Ochroconis atlantica |
MycoBank | / Index Fungorum | - | |
| Ochroconis constricta |
MycoBank | / Index Fungorum | / Genbank | |
| Ochroconis crassihumicola |
MycoBank | / Index Fungorum | - | |
| Ochroconis gallopava |
MycoBank | / Index Fungorum | / Genbank | |
| Ochroconis gamsii |
MycoBank | / Index Fungorum | / Genbank | |
| Ochroconis humicola |
MycoBank | / Index Fungorum | - | |
| Ochroconis simplex |
MycoBank | / Index Fungorum | - | |
| Ochroconis tschawytschae |
- | - | - | |
| Ochroconis tshawytschae |
MycoBank | / Index Fungorum | - | |
| Ochroconis variabilis |
MycoBank | / Index Fungorum | - | |
| Ochroconis verruculosa |
MycoBank | / Index Fungorum | - | |
| Ochronectria calami |
MycoBank | / Index Fungorum | / Genbank | |
| Ocostaspora apilongissima |
MycoBank | / Index Fungorum | - | |
| Ocostaspora sp. |
MycoBank | / Index Fungorum | - | |
| Octospora carbonigena |
MycoBank | / Index Fungorum | - | |
| Octosporomyces japonicus var. japonicus |
MycoBank | / Index Fungorum | - | |
| Octosporomyces octosporus |
MycoBank | / Index Fungorum | - | |
| Odontia arguta |
MycoBank | / Index Fungorum | - | |
| Odontia bara-jovis |
- | - | - | |
| Odontia bicolor |
- | - | - | |
| Odontia calcarea |
MycoBank | / Index Fungorum | - | |
| Odontia capitata |
MycoBank | / Index Fungorum | - | |
| Odontia ciliolata |
MycoBank | / Index Fungorum | - | |
| Odontia crustosa |
MycoBank | / Index Fungorum | - | |
| Odontia fimbriata |
MycoBank | / Index Fungorum | - | |
| Odontia fusco-atra |
- | - | - | |
| Odontia hydnoides |
MycoBank | / Index Fungorum | - | |
| Odontia lyndonii |
- | - | - | |
| Odontia nothofagi |
MycoBank | / Index Fungorum | - | |
| Odontia papillosa |
MycoBank | / Index Fungorum | - | |
| Odontia queletii |
MycoBank | / Index Fungorum | - | |
| Odontia spathulata |
- | - | - | |
| Odontia subabruptus |
- | - | - | |
| Odontia subceracea |
- | - | - | |
| Odontia subfascicularia |
MycoBank | / Index Fungorum | - | |
| Odontia subscopinella |
MycoBank | / Index Fungorum | - | |
| Odontia sulphurella |
MycoBank | / Index Fungorum | - | |
| Odontia tessellata |
MycoBank | / Index Fungorum | - | |
| Odontia uda |
MycoBank | / Index Fungorum | - | |
| Odonticium romellii |
MycoBank | / Index Fungorum | / Genbank | |
| Oedocephalum beticola |
MycoBank | / Index Fungorum | - | |
| Oedocephalum coprophilum |
MycoBank | / Index Fungorum | - | |
| Oedocephalum elegans |
MycoBank | / Index Fungorum | - | |
| Oedocephalum glomerulosum |
MycoBank | / Index Fungorum | - | |
| Oedocephalum guadalcanalense |
MycoBank | / Index Fungorum | - | |
| Oedocephalum lineatum |
MycoBank | / Index Fungorum | - | |
| Oedocephalum nayoroense |
MycoBank | / Index Fungorum | - | |
| Oedocephalum nicotianae |
MycoBank | / Index Fungorum | - | |
| Oedocephalum pallidum |
MycoBank | / Index Fungorum | - | |
| Oedocephalum sp. |
MycoBank | / Index Fungorum | - | |
| Oedogoniomyces sp. |
MycoBank | / Index Fungorum | - | |
| Ogataea allantospora |
MycoBank | / Index Fungorum | - | |
| Ogataea falcaomoraisii |
MycoBank | / Index Fungorum | / Genbank | |
| Ogataea glucozyma |
MycoBank | / Index Fungorum | / Genbank | |
| Ogataea henricii |
MycoBank | / Index Fungorum | / Genbank | |
| Ogataea kodamae |
MycoBank | / Index Fungorum | - | |
| Ogataea minuta |
MycoBank | / Index Fungorum | - | |
| Ogataea minuta var. minuta |
MycoBank | / Index Fungorum | - | |
| Ogataea minuta var. nonfermentans |
MycoBank | / Index Fungorum | - | |
| Ogataea philodendra |
MycoBank | / Index Fungorum | - | |
| Ogataea pini |
MycoBank | / Index Fungorum | / Genbank | |
| Ogataea polymorpha |
MycoBank | / Index Fungorum | / Genbank | |
| Ogataea polymorpha var. nonfermentans |
- | - | - | |
| Ogataea wickerhamii |
MycoBank | / Index Fungorum | - | |
| Ohleria brasiliensis |
MycoBank | / Index Fungorum | - | |
| Oidiodendron ambiguum |
MycoBank | / Index Fungorum | - | |
| Oidiodendron cereale |
MycoBank | / Index Fungorum | - | |
| Oidiodendron cerealis |
MycoBank | / Index Fungorum | / Genbank | |
| Oidiodendron chlamydosporicum |
MycoBank | / Index Fungorum | / Genbank | |
| Oidiodendron citrinum |
MycoBank | / Index Fungorum | / Genbank | |
| Oidiodendron echinulatum |
MycoBank | / Index Fungorum | / Genbank | |
| Oidiodendron flavum |
MycoBank | / Index Fungorum | / Genbank | |
| Oidiodendron fuscum |
MycoBank | / Index Fungorum | - | |
| Oidiodendron griseum |
MycoBank | / Index Fungorum | / Genbank | |
| Oidiodendron maius |
MycoBank | / Index Fungorum | / Genbank | |
| Oidiodendron muniellense |
MycoBank | / Index Fungorum | - | |
| Oidiodendron nigrum |
MycoBank | / Index Fungorum | - | |
| Oidiodendron periconioides |
MycoBank | / Index Fungorum | / Genbank | |
| Oidiodendron pilicola |
MycoBank | / Index Fungorum | / Genbank | |
| Oidiodendron ramosum |
MycoBank | / Index Fungorum | / Genbank | |
| Oidiodendron reticulatum |
MycoBank | / Index Fungorum | / Genbank | |
| Oidiodendron rhodogenum |
MycoBank | / Index Fungorum | / Genbank | |
| Oidiodendron scytaloides |
MycoBank | / Index Fungorum | / Genbank | |
| Oidiodendron setiferum |
MycoBank | / Index Fungorum | / Genbank | |
| Oidiodendron sindenia |
- | - | - | |
| Oidiodendron sp. |
MycoBank | / Index Fungorum | - | |
| Oidiodendron tenuissimum |
MycoBank | / Index Fungorum | / Genbank | |
| Oidiodendron truncatum |
MycoBank | / Index Fungorum | / Genbank | |
| Oidium albicans |
MycoBank | / Index Fungorum | - | |
| Oidium asteroides |
MycoBank | / Index Fungorum | - | |
| Oidium cutaneum |
- | - | - | |
| Oidium gracile |
- | - | - | |
| Oidium hemidermi |
- | - | - | |
| Oidium lactis |
- | - | - | |
| Oidium matalense var. matalense |
- | - | - | |
| Oidium morganii |
MycoBank | / Index Fungorum | - | |
| Oidium piperis |
MycoBank | / Index Fungorum | - | |
| Oidium pullorum |
MycoBank | / Index Fungorum | - | |
| Oidium pullulans |
MycoBank | / Index Fungorum | - | |
| Oidium rubiginosum |
MycoBank | / Index Fungorum | - | |
| Oidium tropicale |
MycoBank | / Index Fungorum | - | |
| Oligoporus caesius |
MycoBank | / Index Fungorum | / Genbank | |
| Oligoporus rennyi |
MycoBank | / Index Fungorum | / Genbank | |
| Oligoporus sp. |
MycoBank | / Index Fungorum | - | |
| Oligoporus subcaesius |
MycoBank | / Index Fungorum | - | |
| Olla millepunctata |
MycoBank | / Index Fungorum | - | |
| Olpitrichum macrosporum |
MycoBank | / Index Fungorum | - | |
| Olpitrichum patulum |
MycoBank | / Index Fungorum | - | |
| Olpitrichum sphaerosporum |
MycoBank | / Index Fungorum | - | |
| Olpitrichum tenellum |
MycoBank | / Index Fungorum | / Genbank | |
| Ombrophila lilacina |
MycoBank | / Index Fungorum | - | |
| Ombrophila microspora |
MycoBank | / Index Fungorum | - | |
| Ombrophila violacea |
MycoBank | / Index Fungorum | / Genbank | |
| Omphalia campanella |
MycoBank | / Index Fungorum | - | |
| Omphalia pigmentata |
MycoBank | / Index Fungorum | - | |
| Omphalia tralucida |
MycoBank | / Index Fungorum | - | |
| Omphalina arctica |
MycoBank | / Index Fungorum | - | |
| Omphalina chionophila |
MycoBank | / Index Fungorum | - | |
| Omphalina gerardiana |
MycoBank | / Index Fungorum | - | |
| Omphalina kuehneri |
MycoBank | / Index Fungorum | - | |
| Omphalina luteolilacina |
MycoBank | / Index Fungorum | - | |
| Omphalina maura |
MycoBank | / Index Fungorum | - | |
| Omphalina mutila |
MycoBank | / Index Fungorum | - | |
| Omphalina obatra |
MycoBank | / Index Fungorum | - | |
| Omphalina pseudomuralis |
MycoBank | / Index Fungorum | - | |
| Omphalina pyxidata |
MycoBank | / Index Fungorum | / Genbank | |
| Omphalina rigidipes |
MycoBank | / Index Fungorum | - | |
| Omphalina rivulicola |
MycoBank | / Index Fungorum | / Genbank | |
| Omphalina velutipes |
MycoBank | / Index Fungorum | - | |
| Omphalotus mexicanus |
MycoBank | / Index Fungorum | / Genbank | |
| Omphalotus olearius |
MycoBank | / Index Fungorum | / Genbank | |
| Omphalotus olivascens var. indigo |
MycoBank | / Index Fungorum | - | |
| Omphalotus subilludens |
MycoBank | / Index Fungorum | / Genbank | |
| Oncocladium flavum |
MycoBank | / Index Fungorum | - | |
| Oncocladium flavum var. robustum |
MycoBank | / Index Fungorum | - | |
| Oncopodiella cubensis |
MycoBank | / Index Fungorum | - | |
| Oncopodium paspali |
MycoBank | / Index Fungorum | - | |
| Oncosporella punctiformis |
MycoBank | / Index Fungorum | - | |
| Ondiniella torquata |
MycoBank | / Index Fungorum | - | |
| Onnia circinata |
MycoBank | / Index Fungorum | - | |
| Onnia leporina |
MycoBank | / Index Fungorum | / Genbank | |
| Onnia orientalis |
MycoBank | / Index Fungorum | / Genbank | |
| Onnia scaura |
MycoBank | / Index Fungorum | - | |
| Onnia tomentosa |
MycoBank | / Index Fungorum | / Genbank | |
| Onnia triquetra |
MycoBank | / Index Fungorum | / Genbank | |
| Onychocola canadensis |
MycoBank | / Index Fungorum | - | |
| Onychophora coprophila |
MycoBank | / Index Fungorum | - | |
| Onygena corvina |
MycoBank | / Index Fungorum | / Genbank | |
| Onygena equina |
MycoBank | / Index Fungorum | / Genbank | |
| Onygena piligena |
MycoBank | / Index Fungorum | - | |
| Oomyces carneo-albus |
- | - | - | |
| Oospora astringenes |
MycoBank | / Index Fungorum | - | |
| Oospora aurantia |
MycoBank | / Index Fungorum | - | |
| Oospora camemberti |
MycoBank | / Index Fungorum | - | |
| Oospora citri-aurantii |
MycoBank | / Index Fungorum | - | |
| Oospora colorans |
MycoBank | / Index Fungorum | - | |
| Oospora crustacea |
MycoBank | / Index Fungorum | - | |
| Oospora dulcita |
MycoBank | / Index Fungorum | - | |
| Oospora egyptiaca |
MycoBank | / Index Fungorum | - | |
| Oospora fragrans |
MycoBank | / Index Fungorum | - | |
| Oospora gigas |
MycoBank | / Index Fungorum | - | |
| Oospora halophila |
MycoBank | / Index Fungorum | - | |
| Oospora humi |
MycoBank | / Index Fungorum | - | |
| Oospora hyalinula |
MycoBank | / Index Fungorum | - | |
| Oospora lactis |
- | - | - | |
| Oospora lactis var. exuberans |
MycoBank | / Index Fungorum | - | |
| Oospora lactis var. parasitica |
MycoBank | / Index Fungorum | - | |
| Oospora minor |
- | - | - | |
| Oospora nectricola |
MycoBank | / Index Fungorum | - | |
| Oospora nicotianae |
MycoBank | / Index Fungorum | - | |
| Oospora nubila |
- | - | - | |
| Oospora oryzae |
MycoBank | / Index Fungorum | - | |
| Oospora polychroma |
MycoBank | / Index Fungorum | - | |
| Oospora pustulans |
MycoBank | / Index Fungorum | - | |
| Oospora roser-flava |
- | - | - | |
| Oospora sajanica |
MycoBank | / Index Fungorum | - | |
| Oospora sp. |
MycoBank | / Index Fungorum | - | |
| Oospora sulphurea |
MycoBank | / Index Fungorum | - | |
| Oospora sulphurella |
MycoBank | / Index Fungorum | - | |
| Oospora sulphureo-ochracea |
- | - | - | |
| Oospora tenuis |
MycoBank | / Index Fungorum | - | |
| Oospora uvarum |
MycoBank | / Index Fungorum | - | |
| Oospora variabilis |
- | - | - | |
| Oospora verticilloides |
- | - | - | |
| Oospora viscosa |
MycoBank | / Index Fungorum | - | |
| Oosporidium margaritiferum |
MycoBank | / Index Fungorum | / Genbank | |
| Opegrapha lichenoides |
MycoBank | / Index Fungorum | - | |
| Operculella padwickii |
MycoBank | / Index Fungorum | - | |
| Ophiobolus acuminatus |
MycoBank | / Index Fungorum | - | |
| Ophiobolus anguillides |
MycoBank | / Index Fungorum | - | |
| Ophiobolus anthrisci |
MycoBank | / Index Fungorum | - | |
| Ophiobolus disseminans |
MycoBank | / Index Fungorum | - | |
| Ophiobolus fulgidus |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiobolus graminis |
MycoBank | / Index Fungorum | - | |
| Ophiobolus graminis var. avenae |
MycoBank | / Index Fungorum | - | |
| Ophiobolus herpotrichus |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiobolus heterostrophus |
MycoBank | / Index Fungorum | - | |
| Ophiobolus kusanoi |
MycoBank | / Index Fungorum | - | |
| Ophiobolus mathieui |
MycoBank | / Index Fungorum | - | |
| Ophiobolus medusae var. minor |
MycoBank | / Index Fungorum | - | |
| Ophiobolus miyabeanus |
MycoBank | / Index Fungorum | - | |
| Ophiobolus ophioboloides |
MycoBank | / Index Fungorum | - | |
| Ophiobolus oryzae |
MycoBank | / Index Fungorum | - | |
| Ophiobolus rubellus |
MycoBank | / Index Fungorum | - | |
| Ophiobolus sativus |
MycoBank | / Index Fungorum | - | |
| Ophiobolus sp. |
MycoBank | / Index Fungorum | - | |
| Ophioceras commune |
MycoBank | / Index Fungorum | / Genbank | |
| Ophioceras dolichostomum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophioceras leptosporum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophioceras sp. |
MycoBank | / Index Fungorum | - | |
| Ophiocordyceps aphodii |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiodothella vaccinii |
MycoBank | / Index Fungorum | / Genbank | |
| Ophionectria cylindrospora |
MycoBank | / Index Fungorum | - | |
| Ophionectria trichospora |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiosphaerella agrostis |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiosphaerella herpotricha |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiosphaerella korrae |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiosphaerella narmari |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiosphaerella sasicola |
MycoBank | / Index Fungorum | - | |
| Ophiostoma abiocarpum |
MycoBank | / Index Fungorum | - | |
| Ophiostoma adjuncti |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma africanum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma ainoae |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma araucariae |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma aureum |
MycoBank | / Index Fungorum | - | |
| Ophiostoma aurorae |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma bacillisporum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma bicolor |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma bragantinum |
MycoBank | / Index Fungorum | - | |
| Ophiostoma brevicolla |
MycoBank | / Index Fungorum | - | |
| Ophiostoma brevicolle |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma brunneociliatum |
MycoBank | / Index Fungorum | - | |
| Ophiostoma canum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma capilliferum |
MycoBank | / Index Fungorum | - | |
| Ophiostoma carpenteri |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma clavatum |
MycoBank | / Index Fungorum | - | |
| Ophiostoma clavigerum |
MycoBank | / Index Fungorum | - | |
| Ophiostoma crassivaginatum |
MycoBank | / Index Fungorum | - | |
| Ophiostoma cucullatum |
MycoBank | / Index Fungorum | - | |
| Ophiostoma dentifundum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma distortum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma dryocoetidis |
MycoBank | / Index Fungorum | - | |
| Ophiostoma epigloeum |
MycoBank | / Index Fungorum | - | |
| Ophiostoma europhioides |
MycoBank | / Index Fungorum | - | |
| Ophiostoma flexuosum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma floccosum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma francke-grosmanniae |
MycoBank | / Index Fungorum | - | |
| Ophiostoma fusiforme |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma galeiforme |
MycoBank | / Index Fungorum | - | |
| Ophiostoma gossypinum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma gossypinum var. robustum |
MycoBank | / Index Fungorum | - | |
| Ophiostoma grande |
MycoBank | / Index Fungorum | - | |
| Ophiostoma grandicarpum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma grandifoliae |
MycoBank | / Index Fungorum | - | |
| Ophiostoma himal-ulmi |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma huntii |
MycoBank | / Index Fungorum | - | |
| Ophiostoma ips |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma japonicum |
MycoBank | / Index Fungorum | - | |
| Ophiostoma kryptum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma laricis |
MycoBank | / Index Fungorum | - | |
| Ophiostoma leptographioides |
MycoBank | / Index Fungorum | - | |
| Ophiostoma longicollum |
MycoBank | / Index Fungorum | - | |
| Ophiostoma longiconidiatum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma lunatum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma megalobrunneum |
MycoBank | / Index Fungorum | - | |
| Ophiostoma microsporum |
MycoBank | / Index Fungorum | - | |
| Ophiostoma minus |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma multiannulatum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma narcissi |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma neglectum |
MycoBank | / Index Fungorum | - | |
| Ophiostoma nigrocarpum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma nigrum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma novo-ulmi |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma novo-ulmi subsp. americana |
MycoBank | / Index Fungorum | - | |
| Ophiostoma olivaceum |
MycoBank | / Index Fungorum | - | |
| Ophiostoma palmiculminatum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma penicillatum |
MycoBank | / Index Fungorum | - | |
| Ophiostoma perfectum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma phasma |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma piceae |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma piceaperdum |
MycoBank | / Index Fungorum | - | |
| Ophiostoma piliferum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma pluriannulata |
- | - | - | |
| Ophiostoma polonicum |
MycoBank | / Index Fungorum | - | |
| Ophiostoma polyporicola |
MycoBank | / Index Fungorum | - | |
| Ophiostoma populinum |
MycoBank | / Index Fungorum | - | |
| Ophiostoma protearum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma pulvinisporum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma quercus |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma roraimense |
MycoBank | / Index Fungorum | - | |
| Ophiostoma rostrocoronatum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma rostrocylindricum |
MycoBank | / Index Fungorum | - | |
| Ophiostoma sagmatosporum |
MycoBank | / Index Fungorum | - | |
| Ophiostoma serpens |
MycoBank | / Index Fungorum | - | |
| Ophiostoma seticolle |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma sp. |
MycoBank | / Index Fungorum | - | |
| Ophiostoma sparsum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma splendens |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma stenoceras |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma subannulatum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma tetropii |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma tremulo-aureum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma triangulosporum |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma ulmi |
MycoBank | / Index Fungorum | / Genbank | |
| Ophiostoma valdivianum |
MycoBank | / Index Fungorum | - | |
| Ophiostoma verrucosum |
MycoBank | / Index Fungorum | - | |
| Ophiostomella rostellata |
MycoBank | / Index Fungorum | - | |
| Ophiovalsa betulae |
MycoBank | / Index Fungorum | / Genbank | |
| Oraniella coffeicola |
MycoBank | / Index Fungorum | - | |
| Orbicula parietina |
MycoBank | / Index Fungorum | / Genbank | |
| Orbilia auricolor |
MycoBank | / Index Fungorum | / Genbank | |
| Orbilia coccinella |
MycoBank | / Index Fungorum | / Genbank | |
| Orbilia piloboloides |
MycoBank | / Index Fungorum | - | |
| Orbilia polypori |
MycoBank | / Index Fungorum | - | |
| Orbilia rubella |
MycoBank | / Index Fungorum | - | |
| Orbilia vinosa |
MycoBank | / Index Fungorum | / Genbank | |
| Orbilia xanthostigma |
MycoBank | / Index Fungorum | - | |
| Orbimyces spectabilis |
MycoBank | / Index Fungorum | - | |
| Orcadia sp. |
MycoBank | / Index Fungorum | - | |
| Ordus tribrachiatus |
MycoBank | / Index Fungorum | - | |
| Osmoporus brunneo-leucus |
- | - | - | |
| Osmoporus carteri |
MycoBank | / Index Fungorum | - | |
| Osmoporus decipiens |
MycoBank | / Index Fungorum | - | |
| Osmoporus durus |
MycoBank | / Index Fungorum | - | |
| Osmoporus floccosus |
MycoBank | / Index Fungorum | - | |
| Osmoporus latus |
MycoBank | / Index Fungorum | - | |
| Osmoporus odoratus |
MycoBank | / Index Fungorum | / Genbank | |
| Osmoporus proteus |
MycoBank | / Index Fungorum | - | |
| Ossicaulis lignatilis |
MycoBank | / Index Fungorum | / Genbank | |
| Osteina obducta |
MycoBank | / Index Fungorum | - | |
| Osteomorpha fragilis |
- | - | - | |
| Ostracoblabe implexa |
MycoBank | / Index Fungorum | - | |
| Ostracoderma pulvinatum |
MycoBank | / Index Fungorum | - | |
| Ostreichnion curtisii |
MycoBank | / Index Fungorum | / Genbank | |
| Ostreichnion sassafras |
MycoBank | / Index Fungorum | / Genbank | |
| Otthia lisae |
MycoBank | / Index Fungorum | - | |
| Otthia spiraeae |
MycoBank | / Index Fungorum | / Genbank | |
| Oudemansiella brunneomarginata |
MycoBank | / Index Fungorum | - | |
| Oudemansiella canarii |
MycoBank | / Index Fungorum | / Genbank | |
| Oudemansiella ephippium |
MycoBank | / Index Fungorum | - | |
| Oudemansiella longipes var. americana |
MycoBank | / Index Fungorum | - | |
| Oudemansiella mucida |
MycoBank | / Index Fungorum | / Genbank | |
| Oudemansiella platyphylla |
MycoBank | / Index Fungorum | - | |
| Oudemansiella radicata |
MycoBank | / Index Fungorum | - | |
| Oudemansiella steffenii |
MycoBank | / Index Fungorum | - | |
| Ovadendron sp. |
MycoBank | / Index Fungorum | - | |
| Ovadendron sulphureo-ochraceum |
- | - | - | |
| Ovadendron sulphureoochraceum |
MycoBank | / Index Fungorum | - | |
| Ovularia decipiens |
MycoBank | / Index Fungorum | - | |
| Ovulinia azaleae |
MycoBank | / Index Fungorum | / Genbank | |
| Ovulinia sp. |
MycoBank | / Index Fungorum | - | |
| Oxydontia chrysorhiza |
MycoBank | / Index Fungorum | - | |
| Oxydothis nypae |
MycoBank | / Index Fungorum | - | |
| Oxydothis ragae |
MycoBank | / Index Fungorum | / Genbank | |
| Oxydothis sp. |
MycoBank | / Index Fungorum | - | |
| Oxyporus corticola |
MycoBank | / Index Fungorum | / Genbank | |
| Oxyporus cuneatus |
MycoBank | / Index Fungorum | / Genbank | |
| Oxyporus latemarginata |
- | - | - | |
| Oxyporus latemarginatus |
MycoBank | / Index Fungorum | / Genbank | |
| Oxyporus obducens |
MycoBank | / Index Fungorum | - | |
| Oxyporus pearsonii |
MycoBank | / Index Fungorum | - | |
| Oxyporus phellodendri |
MycoBank | / Index Fungorum | - | |
| Oxyporus populinus |
MycoBank | / Index Fungorum | / Genbank | |
| Oxyporus ravidus |
MycoBank | / Index Fungorum | - | |
| Ozonium radians |
MycoBank | / Index Fungorum | - | |
| Ozonium sp. |
MycoBank | / Index Fungorum | - | |
| Ozonium taxanum var. paraciticum |
- | - | - | |