Fungal genera: Bacidia [426 taxa], Bacidina [30 taxa], Bacidiopsora [7 taxa], Bacillopeltis [1 taxon], Backusella [4 taxa], Bactridiopsis [2 taxa], Bactridium [8 taxa], Bactrodesmiella [3 taxa], Bactrodesmium [29 taxa], Bactrospora [21 taxa], Baculifera [8 taxa], Badhamia [131 taxa], Badimia [6 taxa], Baeodromus [4 taxa], Baeomyces [5 taxa], Baeospora [10 taxa], Bagcheea [2 taxa], Bagnisiella [55 taxa], Bagnisiopsis [70 taxa], Bahugada [3 taxa], Bahukalasa [1 taxon], Bahupaathra [1 taxon], Bahusaganda [3 taxa], Bahusakala [11 taxa], Bahusandhika [7 taxa], Bahusutrabeeja [2 taxa], Bainieria [1 taxon], Bakerophoma [1 taxon], Balaniopsis [2 taxa], Balansia [367 taxa], Balansiopsis [6 taxa], Balladyna [124 taxa], Balladynastrum [15 taxa], Balladynella [23 taxa], Balladynocallia [1 taxon], Balladynopsis [9 taxa], Ballocephala [2 taxa], Balsamia [2 taxa], Banhegyia [1 taxon], Bankera [9 taxa], Bapalmuia [18 taxa], Barlaea [1 taxon], Barlaeina [1 taxon], Barnettella [5 taxa], Barnettia [11 taxa], Bartalinia [49 taxa], Barya [1 taxon], Basidiella [2 taxa], Basidiobolus [5 taxa], Basidiobotrys [1 taxon], Basidiodendron [45 taxa], Basidiophora [5 taxa], Basidioradulum [21 taxa], Basifimbria [1 taxon], Bathelium [6 taxa], Bathyascus [9 taxa], Batistamnus [8 taxa], Batistina [1 taxon], Batistinula [1 taxon], Batistospora [1 taxon], Battarrea [9 taxa], Baumiella [5 taxa], Beauveria [258 taxa], Beelia [3 taxa], Beenakia [6 taxa], Belainopsis [2 taxa], Belemnospora [10 taxa], Belonia [5 taxa], Belonidium [35 taxa], Beloniella [7 taxa], Beloniella [1 taxon], Belonioscypha [1 taxon], Belonium [28 taxa], Belonopsis [17 taxa], Belonopsis [2 taxa], Beltrania [159 taxa], Beltraniella [81 taxa], Beltraniopsis [54 taxa], Benekea [2 taxa], Beniowskia [70 taxa], Benjaminiella [3 taxa], Berkleasmium [24 taxa], Berlesiella [3 taxa], Bertia [57 taxa], Bettsia [1 taxon], Betulina [3 taxa], Beverwykella [2 taxa], Bhargavaella [1 taxon], Biatora [6 taxa], Biatorella [14 taxa], Biatoridium [9 taxa], Biatorina [2 taxa], Biciliospora [1 taxon], Bifusella [185 taxa], Bifusepta [6 taxa], Biharia [3 taxa], Bilgramia [1 taxon], Bilimbia [28 taxa], Bimeris [2 taxa], Bioconiosporium [3 taxa], Biophomopsis [6 taxa], Bioporthe [1 taxon], Biostictis [8 taxa], Bipolaris [502 taxa], Biscogniauxia [169 taxa], Bispora [27 taxa], Bisporella [236 taxa], Bitancourtia [2 taxa], Bitrimonospora [1 taxon], Bivallum [6 taxa], Bjerkandera [192 taxa], Blakeslea [23 taxa], Blastacervulus [1 taxon], Blastenia [17 taxa], Blastobotrys [4 taxa], Blastocladia [24 taxa], Blastocladiella [1 taxon], Blastocladiopsis [4 taxa], Blastoconium [1 taxon], Blastocystis [1 taxon], Blastomyces [3 taxa], Blastophorum [3 taxa], Blastospora [2 taxa], Blastotrichum [5 taxa], Blennoria [6 taxa], Blodgettia [1 taxon], Bloxamia [8 taxa], Blumeria [1376 taxa], Blumeriella [60 taxa], Boedijnopeziza [1 taxon], Boerlagella [4 taxa], Boerlagiomyces [4 taxa], Bolbitius [35 taxa], Boletellus [9 taxa], Boletinus [37 taxa], Boletopsis [1 taxon], Boletus [5 taxa], Boletus [101 taxa], Bombardia [31 taxa], Bombardioidea [12 taxa], Bombyliospora [21 taxa], Bonaria [4 taxa], Bondarzewia [3 taxa], Boninohydnum [1 taxon], Boothiella [1 taxon], Boreostereum [20 taxa], Borinquenia [1 taxon], Bostrichonema [8 taxa], Bothrodiscus [2 taxa], Botryandromyces [1 taxon], Botryoascus [2 taxa], Botryobasidium [158 taxa], Botryoderma [2 taxa], Botryodiplodia [129 taxa], Botryohypochnus [17 taxa], Botryola [1 taxon], Botryomonilia [3 taxa], Botryophoma [2 taxa], Botryorhiza [19 taxa], Botryosphaeria [837 taxa], Botryosporium [35 taxa], Botryostroma [7 taxa], Botryotinia [724 taxa], Botryotrichum [11 taxa], Botrytis [134 taxa], Bottaria [1 taxon], Bourdotia [20 taxa], Bovilla [3 taxa], Bovista [23 taxa], Bovistella [3 taxa], Brachiosphaera [4 taxa], Brachycladium [1 taxon], Brachyconidiella [9 taxa], Brachydesmiella [1 taxon], Brachydesmium [1 taxon], Brachysporiella [46 taxa], Brachysporium [32 taxa], Branchiomyces [1 taxon], Brasiliomyces [9 taxa], Brauniellula [5 taxa], Brefeldia [2 taxa], Brefeldiella [5 taxa], Brefeldiopycnis [2 taxa], Bremia [205 taxa], Bresadolia [2 taxa], Brevilegnia [5 taxa], Briansuttonia [1 taxon], Briarea [1 taxon], Brigantiaea [22 taxa], Briosia [1 taxon], Brooksia [14 taxa], Broomeia [45 taxa], Broomella [3 taxa], Brunchorstia [121 taxa], Brunnipila [13 taxa], Bryochiton [6 taxa], Bryoglossum [5 taxa], Bryomyces [1 taxon], Bryonora [10 taxa], Bryophagus [1 taxon], Bryoria [161 taxa], Bryoscyphus [5 taxa], Bubakia [32 taxa], Buellia [260 taxa], Buergenerula [3 taxa], Bulbillomyces [11 taxa], Bulbocatenospora [3 taxa], Bulbomollisia [1 taxon], Bulbothrix [153 taxa], Bulbouncinula [1 taxon], Bulgaria [57 taxa], Bulgariastrum [9 taxa], Bulgariella [13 taxa], Bullaria [75 taxa], Bullaserpens [2 taxa], Bulliardella [4 taxa], Bunodophoron [14 taxa], Burenia [1 taxon], Burgoa [1 taxon], Burrillia [11 taxa], Butlerelfia [4 taxa], Byrrha [1 taxon], Byrsomyces [19 taxa], Byssocallis [4 taxa], Byssocaulon [1 taxon], Byssochlamys [3 taxa], Byssocorticium [5 taxa], Byssolecania [23 taxa], Byssoloma [135 taxa], Byssolophis [2 taxa], Byssomerulius [2 taxa], Byssonectria [3 taxa], Byssopeltis [1 taxon], Byssophragmia [1 taxon], Byssoporia [1 taxon], Byssosphaeria [47 taxa], Byssotheciella [2 taxa], Byssothecium [3 taxa]