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