A taxonomical and nomenclatural revision is given of Hygrophorus subsect. Olivaceoumbrini Bat., as found in western and central Europe, and represented by four species. Extensive descriptions and a key to these species are presented. For nomenclatural reasons one new species is described, viz. Hygrophorus persoonii, identical with H. dichrous Kühn. & Romagn. (invalidly published) and H. limacinus in the concept of some authors. Neotypes are designated for H. latitabundus Britz. and H. olivaceoalbus (Fr. ex Fr.) Fr. Special attention is paid to the ecology and geographical distribution of the concerning species in the Netherlands and Belgium.

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Journal Persoonia - Molecular Phylogeny and Evolution of Fungi
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Citation
Arnolds, Eef. (1979). Notes on Hygrophorus—III. The group of Hygrophorus olivaceoalbus (Hygrophorus subsect. Olivaceoumbrini Bat.) in north-western Europe. Persoonia - Molecular Phylogeny and Evolution of Fungi, 10(3), 357–382.