• Species: Arthopyrenia lapponina Anzi
• Remark: see: Arthopyrenia analepta
• Fungus type: saprotrophic
• Treatment in Estonia: synonym

• Species: Arthopyrenia punctiformis (Pers.) A. Massal.
• Remark: see: Naetrocymbe punctiformis
• Fungus type: saprotrophic
• Treatment in Estonia: synonym

• Species: Arthopyrenia rhyponta (Ach.) A. Massal.
• Remark: see: Naetrocymbe rhyponta
• Fungus type: saprotrophic
• Treatment in Estonia: synonym

• Species: Arthothelium ruanum (A. Massal.) Körb.
• Remark: earlier under Arthonia ruana
• Fungus type: lichenized
• Treatment in Estonia: certain

• Species: Arthothelium scandinavicum Th. Fr.
• Remark:
• Fungus type: saprotrophic
• Treatment in Estonia: certain

• Species: Arthothelium spectabile Flot. ex A. Massal.
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain

• Species: Arthrorhaphis aeruginosa R. Sant. & Tønsberg
• Remark:
• Fungus type: lichenicolous
• Treatment in Estonia: certain

• Species: Arthrorhaphis citrinella (Ach.) Poelt
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain

• Species: Arthrosporum populorum A. Massal.
• Remark: see: Toninia populorum (A. Massal.) Kistenich, Timdal, Bendiksby & S. Ekman
• Fungus type: lichenized
• Treatment in Estonia: synonym

• Species: Aspicilia caesiocinerea (Nyl. ex Malbr.) Arnold
• Remark: see: Circinaria caesiocinerea
• Fungus type: lichenized
• Treatment in Estonia: synonym

• Species: Aspicilia calcarea (L.) Mudd
• Remark: see: Circinaria calcarea
• Fungus type: lichenized
• Treatment in Estonia: synonym
• lubi-lehtersamblik

• Species: Aspicilia cinerea (L.) Körb.
• Remark: includes earlier misidentifications of Aspicilia simoënsis Räsänen and Bellemerea alpina (Sommerf.) Clauzade & Cl. Roux
• Fungus type: lichenized
• Treatment in Estonia: certain
• hall lehtersamblik

• Species: Aspicilia contorta (Hoffm.) Kremp. ssp. contorta
• Remark: see: Circinaria contorta
• Fungus type: lichenized
• Treatment in Estonia: synonym

• Species: Aspicilia contorta ssp. hoffmanniana S. Ekman & Fröberg
• Remark: see: Circinaria hoffmanniana
• Fungus type: lichenized
• Treatment in Estonia: synonym

• Species: Aspicilia gibbosa (Ach.) Körb.
• Remark: see: Circinaria gibbosa
• Fungus type: lichenized
• Treatment in Estonia: synonym extinct

• Species: Aspicilia grisea Arnold
• Remark: includes Aspicilia insolata (H. Magn.) Hav.
• Fungus type: lichenized
• Treatment in Estonia: certain

• Species: Aspicilia insolata (H. Magn.) Hav.
• Remark: included in Aspicilia grisea Arnold
• Fungus type: lichenized
• Treatment in Estonia: included in other taxon

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

• Species: Aspicilia leprosescens (Sandst.) Hav.
• Remark: see: Circinaria leprosescens
• Fungus type: lichenized
• Treatment in Estonia: synonym

• Species: Aspicilia moenium (Vain.) G. Thor & Timdal
• Remark: see: Acarospora moenium
• Fungus type: lichenized
• Treatment in Estonia: synonym

• Species: Aspicilia obscurata (Fr.) Arnold
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain extinct

• Species: Aspicilia simoënsis Räsänen
• Remark: excluded as misidentification: re-identified as Aspicilia cinerea
• Fungus type: lichenized
• Treatment in Estonia: misidentification

• Species: Aspicilia verrucigera Hue
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain

• Species: Aspicilia xyloxena (H. Magn.) Vitik., Ahti, Kuusinen, Lommi & T. Ulvinen
• Remark: earlier under Aspicilia zonata; see: Sagedia zonata
• Fungus type: lichenized
• Treatment in Estonia: synonym extinct

• Species: Athelia arachnoidea (Berk.) Jülich
• Remark:
• Fungus type: lichenicolous
• Treatment in Estonia: certain
• parasiitnahkis

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