• Species: Rhizocarpon oederi (Weber) Körb.
• Remark: see: Haugania oederi (Ach.) E.J. Möller & Timdal
• Fungus type: lichenized
• Treatment in Estonia: synonym

• Species: Rhizocarpon petraeum (Wulfen) A. Massal.
• Remark: see: Rehmia petraea (Wulfen) E.J. Möller, Timdal, Haugan & Bendiksby
• Fungus type: lichenized
• Treatment in Estonia: synonym

• Species: Rhizocarpon polycarpum (Hepp) Th. Fr.
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain

• Species: Rhizocarpon reductum Th. Fr.
• Remark: earlier under Rhizocarpon obscuratum; see: Rehmia reducta (Th. Fr.) E.J. Möller, Timdal, Haugan & Bendiksby
• Fungus type: lichenized
• Treatment in Estonia: synonym

• Species: Rhizocarpon richardii (Lamy ex Nyl.) Zahlbr.
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain

• Species: Rhizocarpon subgeminatum Eitner
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain

• Species: Rhizocarpon umbilicatum (Ramond) Flagey
• Remark: see: Rehmia umbilicata (Ramond) E.J. Möller, Timdal, Haugan & Bendiksby
• Fungus type: lichenized
• Treatment in Estonia: synonym

• Species: Rimularia furvella (Nyl. ex Mudd) Hertel & Rambold
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain

• Species: Rimularia insularis (Nyl.) Rambold & Hertel
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain

• Species: Rinodina archaea (Ach.) Arnold
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain

• Species:
• Remark:
• Fungus type:
• Treatment in Estonia: