• (1) Rabenhorstia abietis - Ramalina rectangularis
• (2) Ramalina reducta - Ramariopsis holmskioldii
• (3) Ramariopsis holmskjoldii - Ramularia phaseolina
• (4) Ramularia philadelphi - Repetobasidium americanum
• (5) Repetobasidium canadense - Rhinocladium pulchrum
• (6) Rhinocladium torulosum - Rhizomorpha thermalis
• (7) Rhizomorpha tuberculosa - Rhodocollybia maculata var. maculata
• (8) Rhodocollybia maculata var. scorzonerea - Rhytisma ilicis
• (9) Rhytisma ilicis-canadensis - Rinodina granulans
• (10) Rinodina granularis - Rosellinia aquiloidea
• (11) Rosellinia araneosa - Russula albonigra
• (12) Russula alborosea - Russula mitissima
• (13) Russula modesta - Ryparobius crustaceus var. myriadeus
• (14) Ryparobius diaphanus - Ryvardenia cretacea