| argentina | | dictyota dichotoma | species | 6 | 0 |
| argentina | rio negro province | dictyota dichotoma | species | 5 | 0 |
| argentina | tierra del fuego province | dictyota dichotoma | species | 1 | 0 |
| australia | | dictyota dichotoma | species | 6 | 0 |
| australia | south australia | dictyota dichotoma | species | 10 | 0 |
| brazil | rio de janeiro | dictyota dichotoma | species | 2 | 0 |
| china | | dictyota dichotoma | species | 2 | 0 |
| croatia | | dictyota dichotoma | species | 7 | 0 |
| croatia | dubrovnik-neretva county | dictyota dichotoma | species | 1 | 0 |
| france | | dictyota dichotoma | species | 2 | 0 |
| france | bretagne region | dictyota dichotoma | species | 17 | 0 |
| france | languedoc-roussillon region | dictyota dichotoma | species | 20 | 0 |
| france | nord-pas-de-calais region | dictyota dichotoma | species | 5 | 0 |
| france | provence-alpes-cote d'azur region | dictyota dichotoma | species | 1 | 0 |
| germany | schleswig-holstein | dictyota dichotoma | species | 3 | 0 |
| india | | dictyota dichotoma | species | 2 | 0 |
| ireland | | dictyota dichotoma | species | 3 | 0 |
| ireland | connaught province | dictyota dichotoma | species | 3 | 0 |
| italy | | dictyota dichotoma | species | 14 | 0 |
| italy | | dictyota dichotoma var. intricata | varietas | 14 | 0 |
| italy | campania region | dictyota dichotoma | species | 3 | 0 |
| japan | | dictyota dichotoma | species | 1 | 0 |
| japan | chiba prefecture | dictyota dichotoma | species | 7 | 0 |
| japan | ehime prefecture | dictyota dichotoma | species | 1 | 0 |
| japan | hyogo prefecture | dictyota dichotoma | species | 2 | 0 |
| japan | kochi prefecture | dictyota dichotoma | species | 1 | 0 |
| japan | shizuoka prefecture | dictyota dichotoma | species | 4 | 0 |
| netherlands | zeeland province | dictyota dichotoma | species | 4 | 0 |
| portugal | faro district | dictyota dichotoma | species | 4 | 0 |
| portugal | madeira autonomous region | dictyota dichotoma | species | 17 | 0 |
| portugal | porto district | dictyota dichotoma | species | 207 | 0 |
| south africa | the western cape province | dictyota dichotoma | species | 11 | 0 |
| south korea | | dictyota dichotoma | species | 9 | 0 |
| south korea | | dictyota dichotoma var. linearis | varietas | 2 | 0 |
| south korea | gangwon province | dictyota dichotoma | species | 1 | 0 |
| south korea | north gyeongsang province | dictyota dichotoma | species | 1 | 0 |
| south korea | south jeolla province | dictyota dichotoma | species | 2 | 0 |
| spain | | dictyota dichotoma | species | 2 | 0 |
| spain | asturias | dictyota dichotoma | species | 1 | 0 |
| spain | canary islands | dictyota dichotoma | species | 40 | 0 |
| spain | catalonia | dictyota dichotoma | species | 1 | 0 |
| united kingdom | england | dictyota dichotoma | species | 2 | 0 |
| united kingdom | scotland | dictyota dichotoma | species | 2 | 0 |