Genus Hapalopilus P. Karst.

Revue Mycologique Toulouse 3 (9): 18 (1881)

Type: Polyporus nidulans Fr. : Fr., Systema Mycologicum 1: 362 (1821)

Gilbertson and Ryvarden (1986) describe five species for North America, but all but H. rutilans have been excluded from the genus based on DNA analysis and three other species added Miettinen et al. (2016). Hapalopilus croceus may occur in the Chicago area but is not documented. However that species is now Aurantiporus croceus in the Meruliaceae with Phaeophlebiopsis and Rhizochaete. Polyporic acid makes these species poisonous. The reaction with KOH is reddish to violet, also seen in the related Rhizochaete.

  1. Hapalopilus eupatorii, temperate Europe
  2. Hapalopilus percoctus, Botswana
  3. Hapalopilus ribicola, North Europe
  4. Hapalopilus rutilans (H. nidulans ), holarctic, fairly common in Midwest.
Tradition places it in the Polyporaceae but DNA phylogenies reveal it is in the phlebioid clade.
Related links:
Miettinen, O., V. Spirin, J. Vlasak, B. Rivoire, S. Stenroos, D. S. Hibbett. 2016. Polypores and genus concepts in Phanerochaetaceae (Polyporales, Basidiomycota) MycoKeys 17: 1–46.
Taxon links:
17721 MycoBank ; Index Fungorum ; Species Fungorum