Lachnellula hahniana – synoniem of Lachnellula occidentalis
Lasiobolus ciliatus – synoniem of Lasiobolus papillatus
Leccinum aurantiacum – synoniem of Leccinum rufum
Leccinum testaceoscabrum – synoniem of Leccinum versipelle
Lentinus edodes – synoniem of Lentinula edodes
Lepiota fulvella – synoniem of Lepiota boudieri
Lepista gilva – synoniem of Lepista flaccida
Lepista inversa – synoniem of Lepista flaccida
Lepista nebularis – synoniem of Clitocybe nebularis
Leptoglossum acerosum – synoniem of Omphalina acerosa
Leucoagaricus pudicus – synoniem of Leucoagaricus leucothites
Leucoagaricus pulverulentus – synoniem of Cystolepiota pulverulenta
Leucocoprinus lilacinogranulosus
Leucoscypha rutilans – synoniem of Neottiella rutilans
Lycoperdon mammaeforme – synoniem of Lycoperdon mammiforme
Lyophyllum ulmarius – synoniem of Hypsizygus ulmarius