The genus Alnicola (Hymenogastraceae) contains a majority of host-specific ectomycorrhizal species, associated with various species of alders (Alnus spp.). Three species associated specifically with Alnus alnobetula are described as new and illustrated: Alnicola badiofusca P.-A. Moreau sp. nov., A. pallidifolia P.-A. Moreau & Peintner sp. nov., and A. spectabilis P.-A. Moreau & Peintner sp. nov., and a key is provided for Alnicola species associated with A. alnobetula in the Alps and Corsica.