• Baccata
    • Taxus baccata Missing - Chybi [Aršik 604] [Souvenir Sheet 604]
  • Bactrianus
  • Barr
    • Selenopeltis buchi buchi ( Barr Missing - Chybi .) [Známka 1703] [Stamp 1703]
  • Barrandei
    • Deiphon forbesi, Ophioceras simplex, Carolicrinus barrandei Missing - Chybi [Známka 223] [Stamp 223]
  • Barrandien
  • Bataar
    • Tarbosaurus Bataar Missing - Chybi [Známka 44] [Stamp 44]
  • Bella
    • Dracula bella Missing - Chybi [Přepážkovy list 745] [Minisheet 745]
  • Bellum
    • Non Bellum Missing - Chybi Sed Pax [Známka 992] [Stamp 992]
  • Bernolacius
  • Berus
    • Vipera berus Missing - Chybi [Aršik 814] [Souvenir Sheet 814]
  • Besseae
    • Phragmipedium besseae Missing - Chybi [Aršik 730] [Souvenir Sheet 730]
  • Beta
    • Beta Missing - Chybi vulgaris L. [Známka 1198] [Stamp 1198]
  • Betta
    • Betta Missing - Chybi splendens [Známka 365] [Stamp 365]
  • Betulina
    • Sicista betulina Missing - Chybi [Známka 113] [Stamp 113]
    • Sicista betulina Missing - Chybi [Aršik 691] [Souvenir Sheet 691]
  • Betulus
    • Carpinus betulus Missing - Chybi [Známka 24] [Stamp 24]
  • Bicornis
  • Bielzia
    • Bielzia Missing - Chybi coerulans [Aršik 525] [Souvenir Sheet 525]
  • Bison
    • Bison Missing - Chybi bonassus [Známka 1071] [Stamp 1071]
  • Bizonatum
    • Hypophylloceras bizonatum Missing - Chybi (Fritsch) [Známka 1699] [Stamp 1699]
  • Blechnum
    • Blechnum Missing - Chybi spicant [Aršik 691] [Souvenir Sheet 691]
  • Bleo
    • Rhodocatus bleo Missing - Chybi knuth. [Známka 1635] [Stamp 1635]
  • Bohemiae
    • Proiectus Georgii Regis Bohemiae Missing - Chybi [Známka 1368] [Stamp 1368]
    • Proiectus Georgii Regis Bohemiae Missing - Chybi [Známka 2863] [Stamp 2863]
  • Bohemica
    • Gagea bohemica Missing - Chybi (Z)RS [Známka 2990] [Stamp 2990]
    • Verpa bohemica Missing - Chybi Krombholz [Známka 266] [Stamp 266]
    • Campanula bohemica Missing - Chybi [Kupon 440] [Coupon 440]
  • Bohemus
    • Wencelaus Hollar Bohemus Missing - Chybi [Aršik 520] [Souvenir Sheet 520]
  • Bol
    • Glottiphyllum davisii L. bol Missing - Chybi . [Známka 1633] [Stamp 1633]
  • Boletus
    • Boletus Missing - Chybi edulis [Známka 1019] [Stamp 1019]
    • Boletus Missing - Chybi satanoides [Známka 264] [Stamp 264]
    • Boletus Missing - Chybi gabretae [Aršik 691] [Souvenir Sheet 691]
  • Bombina
    • Bombina bombina Missing - Chybi [Známka 2898] [Stamp 2898]
    • Bombina Missing - Chybi variegata [Známka 2899] [Stamp 2899]
    • Bombina Missing - Chybi variegata [Kupon 816] [Coupon 816]
  • Bombus
    • Bombus Missing - Chybi terrestris [Známka 73] [Stamp 73]
    • Bombus Missing - Chybi terrestris [Aršik 525] [Souvenir Sheet 525]
  • Bonassus
  • Bononiensis
  • Bratislavensis
    • Universitas Comeniana Bratislavensis Missing - Chybi condita MCMXIX [Známka 817] [Stamp 817]
  • Brehm
    • Dryobates major pinetorum Brehm Missing - Chybi [Známka 1078] [Stamp 1078]
    • Picus viridis virescens brehm Missing - Chybi [Známka 1402] [Stamp 1402]
  • Brisceis
  • Bubo
    • Bubo bubo Missing - Chybi [Známka 2758] [Stamp 2758]
    • Bubo bubo Missing - Chybi [Známka 606] [Stamp 606]
    • Bubo bubo Missing - Chybi [Známka 856] [Stamp 856]
  • Buchi
    • Selenopeltis buchi Missing - Chybi buchi (Barr.) [Známka 1703] [Stamp 1703]
  • Bufo
    • Bufo Missing - Chybi viridis [Aršik 773] [Souvenir Sheet 773]
  • Bulbiferum