• Species: Catillaria minuta (A. Massal.) Lettau
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain

• Species: Catillaria nigroclavata (Nyl.) Schuler
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain

• Species: Catinaria atropurpurea (Schaer.) Vězda & Poelt
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain

• Species: Cecidonia umbonella (Nyl.) Triebel & Rambold
• Remark:
• Fungus type: lichenicolous
• Treatment in Estonia: certain

• Species: Cercidospora epipolytropa (Mudd) Arnold
• Remark:
• Fungus type: lichenicolous
• Treatment in Estonia: certain

• Species: Cercidospora macrospora (Uloth) Hafellner & Nav.-Ros.
• Remark:
• Fungus type: lichenicolous
• Treatment in Estonia: certain

• Species: Cetraria aculeata (Schreb.) Fr.
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain
• sarv-käosamblik

• Species: Cetraria ericetorum Opiz
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain
• kitsas käosamblik

• Species: Cetraria islandica ssp. crispiformis (Räsänen) Kärnefelt
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain

• Species: Cetraria islandica (L.) Ach. ssp. islandica
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain
• islandi käosamblik

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