Genus Irpex Fr.

Systema Orbis Vegetabilis 1: 81 (1825)

Type: Sistotrema lacteum Fr., Observationes mycologicae 2: 266 (1818)

We have one widespread species here in North America.

  1. Irpex lacteus

This second list is names that have been used for Chicago Region, such as by Moffatt (1909) and Harper, and their current status.

I have not been able to find a phylogeny of species described as Irpex. The few papers that describe a new species of Irpex have ignored the other species described the previous decade(s). Apparently it is no longer a monotypic genus (having only one species).
Related links:
Moffatt, W. S. 1909. The Higher Fungi of the Chicago Region: Part I, The Hymenomycetes. Natural History Survey, Bulletin No. VII, Part I. Chicago Academy of Sciences. 156 pp., 24 plates.
Wikipedia page for Irpex.
Taxon links:
17858 MycoBank ; Index Fungorum