Radula complanata (order Porellales)
Raesaenenia huuskonenii (order Lecanorales)
Rajania quinata (synonymous, order Ranunculales)
Ramalina aspera (order Lecanorales)
Ramalina calicaris (order Lecanorales)
Ramalina canariensis (order Lecanorales)
Ramalina capitata (order Lecanorales)
Ramalina celastri (order Lecanorales)
Ramalina cuspidata (order Lecanorales)
Ramalina denticulata (order Lecanorales)
Ramalina farinacea (order Lecanorales)
Ramalina fastigiata (order Lecanorales)
Ramalina fimbriata (order Lecanorales)
Ramalina fraxinea (order Lecanorales)
Ramalina furcellata (order Lecanorales)
Ramalina lacera (order Lecanorales)
Ramalina meridionalis (order Lecanorales)
Ramalina mollis (order Lecanorales)
Ramalina peruviana (order Lecanorales)
Ramalina requienii (order Lecanorales)
Ramalina sharpii (order Lecanorales)
Ramalina siliquosa (order Lecanorales)
Ramalina sinensis (order Lecanorales)
Ramalina subfarinacea (order Lecanorales)
Ramalina translucida (order Lecanorales)
Ramaria corrugata (synonymous, order Gomphales)
Ramaria myceliosa (synonymous, order Gomphales)
Rana temporaria (order Anura)
Ranella olearia (synonymous, order Sorbeoconcha)
Ranella olearium (order Sorbeoconcha)
Ranunculus aconitifolius (order Ranunculales)
Ranunculus acris (order Ranunculales)
Ranunculus bulbosus (order Ranunculales)
Ranunculus graminis (order Ranunculales)
Ranunculus muricatus (order Ranunculales)
Ranunculus ololeucos (order Ranunculales)
Ranunculus repens (order Ranunculales)
Ranunculus trilobus (order Ranunculales)
Rapanea melanophloeos (order Ericales)
Raphia farinifera (order Arecales)
Rapistrum rugosum (order Brassicales)
Rattus rattus (order Rodentia)
Rattus norvegicus (order Rodentia)
Ravenala madagascariensis (order Zingiberales)
Ravenea sambiranensis (order Arecales)
Ravenelia spegazziniana (order Pucciniales)
Reboulia hemisphaerica (order Marchantiales)
Rebutia heliosa x pulvinosa (order Caryophyllales)
Rebutia steinbachii (synonymous, order Caryophyllales)
Reichardia picrioides (order Asterales)
Reichardia tingitana (order Asterales)
Relicina abstrusa (order Lecanorales)
Relicina circumnodata (order Lecanorales)
Relicinopsis intertexta (order Lecanorales)
Reseda alba (order Brassicales)
Reseda lutea (order Brassicales)
Reseda paui (order Brassicales)
Reseda phyteuma (order Brassicales)
Reseda stricta (order Brassicales)
Reseda valentina (synonymous, order Brassicales)
Retama monosperma (order Fabales)
Retama sphaerocarpa (order Fabales)
Rhabderemia sorokinae (order Poecilosclerida)
Rhagio scolopaceus (order Diptera)
Rhagium inquisitor (order Coleoptera)
Rhagonycha fulva (order Coleoptera)
Rhamnus frangula (synonymous, order Rosales)
Rhamnus lycioides (order Rosales)
Rhaphigaster nebulosa (order Hemiptera)
Rhaponticum coniferum (order Asterales)
Rhinanthus alectorolophus (order Lamiales)
Rhinella marinus (order Anura)
Rhipicephalus sanguineus (order Ixodida)
Rhizocarpon disporum (order Rhizocarpales)
Rhizocarpon distinctum (order Rhizocarpales)
Rhizocarpon geographicum (order Rhizocarpales)
Rhizocarpon lavatum (order Rhizocarpales)
Rhizocarpon obscuratum (order Rhizocarpales)
Rhizocarpon reductum (order Rhizocarpales)
Rhizocarpon ridescens (order Rhizocarpales)
Rhizogonium pervilleanum (synonymous, orden Rhizogoniales)
Rhizophora mangle (order Malpighiales)
Rhizoplaca melanophthalma (order Lecanorales)
Rhizopogon luteolus (synonymous, order Boletales)
Rhizopogon obtextus (order Boletales)
Rhizostoma pulmo (order Rhizostomeae)
Rhodanthidium sticticum (order Hymenoptera)
Rhodobryum roseum (order Bryales)
Rhodococcus fascians (order Mycobacteriales)
Rhodocolea involucrata (order Lamiales)
Rhodocollybia butyracea (order Agaricales)
Rhododendron arboreum (order Ericales)
Rhododendron ferrugineum (order Ericales)
Rhododendron macabeanum (order Ericales)
Rhododendron purdomii (order Ericales)
Rhododendron rex (order Ericales)
Rhododendron schlippenbachii (order Ericales)
Rhodometra sacraria (order Lepidoptera)
Rhopalosiphon maidis (order Hemiptera)
Rhopalosiphon nymphaeae (order Hemiptera)
Rhopalosiphon padi (order Hemiptera)
Rhus natalensis (order Sapindales)
Rhus virens (order Sapindales)
Rhynchium oculatum (order Hymenoptera)
Rhynchophorus ferrugineus (order Coleoptera)
Rhynchostegiella litorea (order Hypnales)
Rhynchostegiella tenella (order Hypnales)
Rhynchostegium megapolitanum (order Hypnales)
Rhynchostegium riparioides (synonymous, order Hypnales)
Rhynochoris annulatus (order Hemiptera)
Rhytideres plicatus (order Coleoptera)
Rhytidiadelphus squarrosus (order Hypnales)
Rhytidiadelphus triquetrus (order Hypnales)
Ribes uva-crispa (order Saxifragales)
Ricasolia amplissima (order Peltigerales)
Ricasolia patinifera (order Peltigerales)
Riccia atromarginata (order Marchantiales)
Riccia cavernosa (order Marchantiales)
Riccia fluitans (order Marchantiales)
Riccia lamellosa (order Marchantiales)
Riccia sorocarpa (order Marchantiales)
Rickenella fibula (order Hymenochaetales)
Rickenella swartzii (order Hymenochaetales)
Rivetina thunbergi (synonymous, order Mantodea)
Rivina humilis (order Caryophyllales)
Rivularia bullata (order Nostocales)
Robinia luxurians (synonymous, order Fabales)
Robinia neomexicana (order Fabales)
Robinia pseudoacacia (order Fabales)
Roccella elisabethae (order Arthoniales)
Roccella fuciformis (order Arthoniales)
Roemeria hybrida (order Ranunculales)
Roldana aschenborniana (order Asterales)
Roldana petasitis (order Asterales)
Romjularia lurida (order Lecanorales)
Rorippa pyrenaica (order Brassicales)
Rosa canina (order Rosales)
Rosa rugosa (order Rosales)
Rosa sempervirens (order Rosales)
Rosmarinus officinalis (order Lamiales)
Rostraria cristata (order Poales)
Rosulabryum capillare (order Bryales)
Rosulabryum torquescens (order Bryales)
Rubus mauensis (synonymous, order Rosales)
Rubus pectinellus (order Rosales)
Rubus volkensii (order Rosales)
Ruellia makoyana (order Lamiales)
Ruellia tuberosa (order Lamiales)
Ruditapes philippinarum (order Veneroida)
Rumex acetosa (order Caryophyllales)
Rumex crispus (order Caryophyllales)
Rumex lunaria (order Caryophyllales)
Rumex obtusifolius (order Caryophyllales)
Rumex pulcher (order Caryophyllales)
Rumina decollata (order Pulmonata)
Ruppia maritima (order Pulmonata)
Ruptoseptoria unedonis (order Capnodiales)
Rusavskia elegans (order Teloschistales)
Ruschia caroli (order Caryophyllales)
Ruscus aculeatus (order Asparagales)
Ruscus racemosus (synonymous, order Asparagales)
Ruspolia nitidula (order Orthoptera)
Russula chloroides (order Russulales)
Russula olivacea (order Russulales)
Russula pectinatoides (order Russulales)
Russula persicina (order Russulales)
Russula torulosa (order Russulales)
Rutpela maculata (order Coleoptera)
Ryssota otaheitana (order Pulmonata)
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