| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| RABI | Ramalina bistorta Nyl. | bistort cartilage lichen | Ramalinaceae
|
| RACA7 | Ramalina calicaris (L.) Fr. | cartilage lichen | Ramalinaceae
|
| RACA12 | Ramalina canariensis J. Steiner | cartilage lichen | Ramalinaceae
|
| RACE | Ramalina celastri (Sprengel) Krog & Swinscow | cartilage lichen | Ramalinaceae
|
| RACE2 | Ramalina cephalota Tuck. | Vermilacinia cephalota | Ramalinaceae
|
| RACO11 | Ramalina cochlearis Zahlbr. | cochlear cartilage lichen | Ramalinaceae
|
| RACO13 | Ramalina combeoides Nyl. | Vermilacinia combeoides | Ramalinaceae
|
| RACO12 | Ramalina complanata (Sw.) Ach. | cartilage lichen | Ramalinaceae
|
| RACR | Ramalina crinita Tuck. | Trichoramalina crinita | Ramalinaceae
|
| RADA | Ramalina dasypoga Tuck. | cartilage lichen | Ramalinaceae
|
| RADE4 | Ramalina dendriscoides Nyl. | cartilage lichen | Ramalinaceae
|
| RADE5 | Ramalina denticulata Nyl. | denticulate cartilage lichen | Ramalinaceae
|
| RADI60 | Ramalina dilacerata (Hoffm.) Hoffm. | cartilage lichen | Ramalinaceae
|
| RADU | Ramalina duriaei (De Not.) Bagl. | Ramalina lacera | Ramalinaceae
|
| RAEC | Ramalina ecklonii auct. | Ramalina celastri | Ramalinaceae
|
| RAEV | Ramalina evernioides Nyl. | cartilage lichen | Ramalinaceae
|
| RAFA60 | Ramalina farinacea (L.) Ach. | farinose cartilage lichen | Ramalinaceae
|
| RAFA4 | Ramalina fastigiata (Pers.) Ach. | cartilage lichen | Ramalinaceae
|
| RAFR | Ramalina fraxinea (L.) Ach. | cartilage lichen | Ramalinaceae
|
| RAGE2 | Ramalina geniculata Hook. f. & Taylor | cartilage lichen | Ramalinaceae
|
| RAHO2 | Ramalina homalea Ach. | Niebla homalea | Ramalinaceae
|
| RAHY4 | Ramalina hypoprotocetrarica Culb. | cartilage lichen | Ramalinaceae
|
| RAINI3 | Ramalina inflata (Hook. f. & Taylor) Hook. f. & Taylor ssp. inflata | inflated cartilage lichen | Ramalinaceae
|
| RAIN5 | Ramalina inflata (Hook. f. & Taylor) Hook. f. & Taylor | inflated cartilage lichen | Ramalinaceae
|
| RAIN3 | Ramalina intermedia (Delise ex Nyl.) Nyl. | intermediate cartilage lichen | Ramalinaceae
|
| RALA7 | Ramalina lacera (With.) J. R. Laundon | cartilage lichen | Ramalinaceae
|
| RALE2 | Ramalina leptocarpha Tuck. | cartilage lichen | Ramalinaceae
|
| RALI5 | Ramalina linearis (Sw.) Ach. | linear cartilage lichen | Ramalinaceae
|
| RAME60 | Ramalina menziesii Taylor | Menzies' cartilage lichen | Ramalinaceae
|
| RAME2 | Ramalina menziesii Tuck. | Ramalina leptocarpha | Ramalinaceae
|
| RAMI7 | Ramalina minuscula (Nyl.) Nyl. | Ramalina dilacerata | Ramalinaceae
|
| RAMO5 | Ramalina montagnei De Not. | Montagne's cartilage lichen | Ramalinaceae
|
| RAOB60 | Ramalina obtusata (Arnold) Bitter | obtuse cartilage lichen | Ramalinaceae
|
| RAPA8 | Ramalina paludosa B. Moore | cartilage lichen | Ramalinaceae
|
| RAPE6 | Ramalina peruviana Ach. | Peruvian cartilage lichen | Ramalinaceae
|
| RAPE7 | Ramalina petrina Bowler & Rundel | cartilage lichen | Ramalinaceae
|
| RAPO60 | Ramalina pollinaria (Westr.) Ach. | cartilage lichen | Ramalinaceae
|
| RAPO5 | Ramalina pollinariella Nyl. | Ramalina roesleri | Ramalinaceae
|
| RAPO4 | Ramalina polymorpha (Lilj.) Ach. | cartilage lichen | Ramalinaceae
|
| RAPU5 | Ramalina puberulenta Riefner & Bowler | cartilage lichen | Ramalinaceae
|
| RARE8 | Ramalina reagens (de Lesd.) Culb. | cartilage lichen | Ramalinaceae
|
| RARE7 | Ramalina reticulata (Nohden) Krempelh. | Ramalina menziesii | Ramalinaceae
|
| RARI | Ramalina rigida Pers. ex Ach. | rigid cartilage lichen | Ramalinaceae
|
| RARO60 | Ramalina roesleri (Hochst. ex Schaerer) Hue | Roesler's cartilage lichen | Ramalinaceae
|
| RASC5 | Ramalina scoparia Vainio | cartilage lichen | Ramalinaceae
|
| RASI60 | Ramalina sinensis Jatta | cartilage lichen | Ramalinaceae
|
| RASO | Ramalina sorediantha Nyl. | soredia cartilage lichen | Ramalinaceae
|
| RAST4 | Ramalina stenospora Mull. Arg. | cartilage lichen | Ramalinaceae
|
| RASU5 | Ramalina subamplicata (Nyl.) Fink | cartilage lichen | Ramalinaceae
|
| RASU6 | Ramalina subleptocarpha Rundel & Bowler | cartilage lichen | Ramalinaceae
|
| RASU7 | Ramalina subpellucida Mull. Arg. | cartilage lichen | Ramalinaceae
|
| RATE9 | Ramalina tenuis (Tuck.) G. Merr. | cartilage lichen | Ramalinaceae
|
| RATE10 | Ramalina testudinaria Nyl. | Niebla homalea | Ramalinaceae
|
| RATH2 | Ramalina thrausta (Ach.) Nyl. | cartilage lichen | Ramalinaceae
|
| RAUN2 | Ramalina unifolia J. W. Thomson | oneleaf cartilage lichen | Ramalinaceae
|
| RAUS2 | Ramalina usnea (L.) R. Howe | usnea cartilage lichen | Ramalinaceae
|
| RAWI | Ramalina willeyi R. Howe | Willey's cartilage lichen | Ramalinaceae
|
| RAYE | Ramalina yemensis (Ach.) Nyl. | Ramalina celastri | Ramalinaceae
|
| RAMAL2 | Ramalina Ach. | cartilage lichen | Ramalinaceae
|
| RAEL | Ramischia elatior Rydb. | Orthilia secunda | Pyrolaceae
|
| RASE2 | Ramischia secunda (L.) Garcke | Orthilia secunda | Pyrolaceae
|
| RANI4 | Ramium niveum (L.) Small | Boehmeria nivea | Urticaceae
|
| RAAB3 | Ramonia ablephora (Nyl. ex Hasse) R. C. Harris | | Gyalectaceae
|
| RAAB2 | Ramonia absconsa (Tuck.) Vezda | | Gyalectaceae
|
| RAGY | Ramonia gyalectiformis (Zahlbr.) Vezda | Ramonia ablephora | Gyalectaceae
|
| RAMA8 | Ramonia malmei Vezda | | Gyalectaceae
|
| RAMI6 | Ramonia microspora Vezda | | Gyalectaceae
|
| RARA3 | Ramonia rappii Vezda | | Gyalectaceae
|
| RAVA2 | Ramonia valenzueliana (Mont.) Stizenb. | | Gyalectaceae
|
| RAMON | Ramonia Stizenb. | ramonia | Gyalectaceae
|
| RAACM2 | Randia aculeata L. var. mitis (L.) Griseb. | Randia aculeata | Rubiaceae
|
| RAAC | Randia aculeata L. | white indigoberry | Rubiaceae
|
| RACL | Randia clusiifolia (Jacq.) Chapman | Casasia clusiifolia | Rubiaceae
|
| RAFO2 | Randia formosa (Jacq.) K. Schum. | jasmin de rosa | Rubiaceae
|
| RAMI4 | Randia mitis L. | Randia aculeata | Rubiaceae
|
| RAPA4 | Randia parvifolia Lam. | smallflower indigoberry | Rubiaceae
|
| RAPO2 | Randia portoricensis (Urban) Britt. & Standl. | Puerto Rico indigoberry | Rubiaceae
|
| RARH2 | Randia rhagocarpa Standl. | crucillo | Rubiaceae
|
| RANDI | Randia L. | indigoberry | Rubiaceae
|
| RAABA | Ranunculus abortivus L. ssp. acrolasius (Fern.) Kapoor & A.& D. L�ve | Ranunculus abortivus | Ranunculaceae
|
| RAABA3 | Ranunculus abortivus L. var. acrolasius Fern. | Ranunculus abortivus | Ranunculaceae
|
| RAABE | Ranunculus abortivus L. var. eucyclus Fern. | Ranunculus abortivus | Ranunculaceae
|
| RAABH | Ranunculus abortivus L. var. harveyi Gray | Ranunculus harveyi | Ranunculaceae
|
| RAABI | Ranunculus abortivus L. var. indivisus Fern. | Ranunculus abortivus | Ranunculaceae
|
| RAABT | Ranunculus abortivus L. var. typicus Fern. | Ranunculus abortivus | Ranunculaceae
|
| RAAB | Ranunculus abortivus L. | littleleaf buttercup | Ranunculaceae
|
| RAACA2 | Ranunculus acriformis Gray var. acriformis | sharpleaf buttercup | Ranunculaceae
|
| RAACA | Ranunculus acriformis Gray var. aestivalis L. Benson | Ranunculus aestivalis | Ranunculaceae
|
| RAACM | Ranunculus acriformis Gray var. montanensis (Rydb.) L. Benson | mountain sharp buttercup | Ranunculaceae
|
| RAACT | Ranunculus acriformis Gray var. typicus L. Benson | Ranunculus acriformis var. acriformis | Ranunculaceae
|
| RAAC2 | Ranunculus acriformis Gray | sharpleaf buttercup | Ranunculaceae
|
| RAACS | Ranunculus acris L. ssp. strigulosus (Schur) Hyl. | Ranunculus acris var. acris | Ranunculaceae
|
| RAACA3 | Ranunculus acris L. var. acris | showy buttercup | Ranunculaceae
|
| RAACA4 | Ranunculus acris L. var. aestivalis (L. Benson) Welsh | Ranunculus aestivalis | Ranunculaceae
|
| RAACF | Ranunculus acris L. var. frigidus Regel | tall buttercup | Ranunculaceae
|
| RAACL | Ranunculus acris L. var. latisectus G. Beck | Ranunculus acris var. acris | Ranunculaceae
|
| RAACS2 | Ranunculus acris L. var. stevenii (Andrz. ex Bess.) Lange | Ranunculus acris var. acris | Ranunculaceae
|
| RAACT2 | Ranunculus acris L. var. typicus G. Beck | Ranunculus acris var. acris | Ranunculaceae
|
| RAACV | Ranunculus acris L. var. villosus (Drab.) S.M. Coles | Ranunculus acris var. acris | Ranunculaceae
|
| RAAC3 | Ranunculus acris L. | tall buttercup | Ranunculaceae
|
| RAADA2 | Ranunculus adoneus Gray var. adoneus | alpine buttercup | Ranunculaceae
|