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