Lachnellula hahniana – synonym of Lachnellula occidentalis
Laricifomes officinalis – synonym of Fomitopsis officinalis
Lasiobolus ciliatus – synonym of Lasiobolus papillatus
Leccinum aurantiacum – synonym of Leccinum rufum
Leccinum testaceoscabrum – synonym of Leccinum versipelle
Lentinus edodes – synonym of Lentinula edodes
Lepiota fulvella – synonym of Lepiota boudieri
Lepista gilva – synonym of Lepista flaccida
Lepista inversa – synonym of Lepista flaccida
Lepista nebularis – synonym of Clitocybe nebularis
Leptoglossum acerosum – synonym of Omphalina acerosa
Leptostroma virgultorum – synonym of Hypoderma rubi
Leucoagaricus pudicus – synonym of Leucoagaricus leucothites
Leucoagaricus pulverulentus – synonym of Cystolepiota pulverulenta
Leucocoprinus lilacinogranulosus
Leucoscypha rutilans – synonym of Neottiella rutilans
Ling-zhi (Chinese) - formerly 'Ling Chih' – synonym of Ganoderma lucidum
Lycoperdon mammaeforme – synonym of Lycoperdon mammiforme
Lyophyllum ulmarius – synonym of Hypsizygus ulmarius