A new name is introduced for the small-sized variant of Melanoleuca polioleuca, formerly also recognized as f. oreina. The authors demonstrate that the use of this epithet is undesirable because it is not likely that Agaricus oreinus Fr.: Fr. represents the same taxon.

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Journal Persoonia - Molecular Phylogeny and Evolution of Fungi
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Released under the CC-BY 4.0 ("Attribution") License

Citation
Boekhout, Teun, & Kuyper, T. W. (1996). Notulae ad Floram agaricinam neerlandicam — XXX. Melanoleuca polioleuca forma pusilla Boekhout & Kuyper. A new name for Melanoleuca polioleuca forma oreina (Fr.: Fr.) Boekhout. Persoonia - Molecular Phylogeny and Evolution of Fungi, 16(2), 253–254.