• Species: Hobsonia christiansenii B.L. Brady & D. Hawksw.
• Remark: see: Illosporiopsis christiansenii
• Fungus type: lichenicolous
• Treatment in Estonia: synonym

• Species: Homostegia piggotii (Berk. & Broome) P. Karst.
• Remark:
• Fungus type: lichenicolous
• Treatment in Estonia: certain

• Species: Hymenelia carnosula (Arnold) Lutzoni
• Remark: earlier under Ionaspis carnosula (Arnold) Arnold
• Fungus type: lichenized
• Treatment in Estonia: certain

• Species: Hymenelia epulotica (Ach.) Lutzoni
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain

• Species: Hymenelia heteromorpha (Kremp.) Lutzoni
• Remark: earlier under Ionaspis heteromorpha (Kremp.) Arnold
• Fungus type: lichenized
• Treatment in Estonia: certain

• Species: Hymenelia rhodopis (Sommerf.) Lutzoni
• Remark: earlier under Ionaspis rhodopis (Sommerf.) Blomb. & Forssell
• Fungus type: lichenized
• Treatment in Estonia: certain

• Species: Hyperphyscia adglutinata H. Mayrhofer & Poelt
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: doubtful extinct
• liimjas liibsamblik

• Species: Hypocenomyce anthracophila (Nyl.) P. James & Gotth. Schneid.
• Remark: see: Carbonicola anthracophila
• Fungus type: lichenized
• Treatment in Estonia: synonym
• männi-soomussamblik

• Species: Hypocenomyce caradocensis (Leigth. ex Nyl.) P. James & Gotth. Schneid.
• Remark: see: Xylopsora caradocensis
• Fungus type: lichenized
• Treatment in Estonia: synonym
• põis-soomussamblik

• Species: Hypocenomyce castaneocinerea (Räsänen) Timdal
• Remark: see: Carbonicola myrmecina
• Fungus type: lichenized
• Treatment in Estonia: synonym
• kastanpruun soomussamblik

• Species: Hypocenomyce friesii (Ach.) P. James & Gotth. Schneid.
• Remark: see: Xylopsora friesii
• Fungus type: lichenized
• Treatment in Estonia: synonym
• Friesi soomussamblik

• Species: Hypocenomyce praestabilis (Nyl.) Timdal
• Remark: see: Pycnora praestabilis
• Fungus type: lichenized
• Treatment in Estonia: synonym

• Species: Hypocenomyce scalaris (Ach.) M. Choisy
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain
• trepp-soomussamblik

• Species: Hypocenomyce sorophora (Vain.) P. James & Poelt
• Remark: see: Pycnora sorophora
• Fungus type: lichenized
• Treatment in Estonia: synonym
• tera-soomussamblik

• Species: Hypogymnia farinacea Zopf
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain
• jahu-hallsamblik

• Species: Hypogymnia physodes (L.) Nyl.
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain
• harilik hallsamblik

• Species: Hypogymnia tubulosa (Schaer.) Hav.
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain
• toru-hallsamblik

• Species: Hypogymnia vittata (Ach.) Parrique
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain
• ääris-hallsamblik

• Species: Icmadophila ericetorum (L.) Zahlbr.
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain
• harilik rabasamblik

• Species: Illosporiopsis christiansenii (B.L. Brady & D. Hawksw.) D. Hawksw.
• Remark: earlier under Hobsonia christiansenii B.L. Brady & D. Hawksw.
• Fungus type: lichenicolous
• Treatment in Estonia: certain

• Species: Illosporium carneum Fr.
• Remark: see: Pronectria robergei (= name of the teleomorph)
• Fungus type: lichenicolous
• Treatment in Estonia: synonym

• Species: Imshaugia aleurites (Ach.) S.L.F. Meyer
• Remark:
• Fungus type: lichenized
• Treatment in Estonia: certain
• hall terasamblik

• Species: Intralichen christiansenii (D. Hawskw.) D. Hawksw. & M.S. Cole
• Remark: earlier under Bispora christiansenii D. Hawksw.
• Fungus type: lichenicolous
• Treatment in Estonia: certain

• Species: Intralichen lichenum (Diederich) D. Hawksw. & M.S. Cole
• Remark: earlier under Bispora lichenum Diederich
• Fungus type: lichenicolous
• Treatment in Estonia: certain

• Species: Ionaspis carnosula (Arnold) Arnold
• Remark: see: Hymenelia carnosula
• Fungus type: lichenized
• Treatment in Estonia: synonym

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