Géneros de hongos: Rabenhorstia [2 taxones], Raciborskiella [18 taxones], Racodium [2 taxones], Radiigera [1 taxon], Radiomyces [12 taxones], Radulomyces [2 taxones], Radulum [12 taxones], Raffaelea [1 taxon], Ragnhildiana [10 taxones], Raizadenia [2 taxones], Ramakrishnanella [1 taxon], Ramalea [1 taxon], Ramalia [1 taxon], Ramalina [774 taxones], Ramaraomyces [1 taxon], Ramaria [109 taxones], Ramaricium [6 taxones], Ramariopsis [8 taxones], Ramboldia [10 taxones], Ramichloridium [53 taxones], Ramicola [2 taxones], Ramonia [8 taxones], Ramsbottomia [2 taxones], Ramularia [1757 taxones], Ramulariopsis [1 taxon], Ramulaspera [3 taxones], Ramulispora [71 taxones], Ravenelia [902 taxones], Readeriella [21 taxones], Rebentischia [8 taxones], Rectipilus [1 taxon], Redaellia [2 taxones], Redbia [15 taxones], Reddellomyces [14 taxones], Rehmiodothis [14 taxones], Rehmiomycella [1 taxon], Reimnitzia [5 taxones], Relicina [25 taxones], Relicinopsis [19 taxones], Remispora [3 taxones], Renispora [1 taxon], Repetobasidium [5 taxones], Repetophragma [1 taxon], Resendea [1 taxon], Resinicium [54 taxones], Resupinatus [146 taxones], Retiarius [1 taxon], Reticularia [43 taxones], Reticulosphaeria [1 taxon], Retroconis [3 taxones], Rhabdoclema [1 taxon], Rhabdocline [77 taxones], Rhabdospora [159 taxones], Rhachomyces [3 taxones], Rhacodium [2 taxones], Rhacophyllus [2 taxones], Rhadinomyces [2 taxones], Rhagadolobium [3 taxones], Rhagadostoma [2 taxones], Rhamphoria [7 taxones], Rhamphospora [10 taxones], Rhaphidicyrtis [1 taxon], Rhexophiale [1 taxon], Rhinocladiella [36 taxones], Rhinocladium [13 taxones], Rhinotrichella [3 taxones], Rhinotrichum [28 taxones], Rhizidiomyces [5 taxones], Rhizina [15 taxones], Rhizoclosmatium [2 taxones], Rhizoctonia [368 taxones], Rhizodiscina [3 taxones], Rhizomorpha [6 taxones], Rhizomorpha [2 taxones], Rhizomucor [25 taxones], Rhizomyces [1 taxon], Rhizophlyctis [18 taxones], Rhizophydium [31 taxones], Rhizopogon [28 taxones], Rhizopus [563 taxones], Rhizosphaera [11 taxones], Rhizosphaerina [1 taxon], Rhodoarrhenia [4 taxones], Rhodocollybia [37 taxones], Rhodocybe [14 taxones], Rhodogaster [2 taxones], Rhodopaxillus [2 taxones], Rhodopeziza [1 taxon], Rhodophyllus [33 taxones], Rhodosporidium [3 taxones], Rhodosticta [4 taxones], Rhodothallus [1 taxon], Rhodotorula [51 taxones], Rhodotus [1 taxon], Rhombostilbella [6 taxones], Rhopalomyces [8 taxones], Rhopalostroma [4 taxones], Rhopographus [19 taxones], Rhynchodiplodia [1 taxon], Rhynchomeliola [7 taxones], Rhynchomyces [1 taxon], Rhynchoseptoria [1 taxon], Rhynchosphaeria [10 taxones], Rhynchosporium [75 taxones], Rhynchostoma [2 taxones], Rhysotheca [2 taxones], Rhytidenglerula [7 taxones], Rhytidhysterium [58 taxones], Rhytidhysteron [133 taxones], Rhytidospora [3 taxones], Rhytisma [2212 taxones], Rhytismites [1 taxon], Richoniella [1 taxon], Rickenella [13 taxones], Rickia [5 taxones], Riessia [4 taxones], Rigidoporus [404 taxones], Rimbachia [13 taxones], Rinodina [93 taxones], Riopa [1 taxon], Ripartitella [5 taxones], Ripartites [10 taxones], Rizalia [1 taxon], Rizaliopsis [2 taxones], Robergea [22 taxones], Robillarda [30 taxones], Robillarda [2 taxones], Roccella [29 taxones], Roesleria [19 taxones], Roestelia [3 taxones], Rogellia [2 taxones], Rogersella [1 taxon], Roigiella [4 taxones], Romellia [1 taxon], Rosellinia [475 taxones], Rosenscheldia [13 taxones], Rosenscheldiella [12 taxones], Roseodiscus [4 taxones], Rostkovites [1 taxon], Rostrella [2 taxones], Rostronitschkia [18 taxones], Rostrospora [1 taxon], Rostrupia [1 taxon], Rota [1 taxon], Rotiferophthora [10 taxones], Roumegueriella [1 taxon], Roussoëlla [2 taxones], Royoungia [1 taxon], Rozella [3 taxones], Rozites [10 taxones], Rubikia [2 taxones], Ruhlandiella [5 taxones], Russula [360 taxones], Ruthia [1 taxon], Rutola [6 taxones], Rutstroemia [91 taxones], Ryparobius [26 taxones]