Abstract
Cortinarius
subgenus
Myxacium
has been used since the times of Elias Fries to denote a large group of species characterized by a viscid universal veil. In molecular studies during the past decades, the subgenus was shown to be polyphyletic. In this study, we emend the circumscription of the subgenus, taking into consideration recent research involving taxa from both hemispheres. Known sections of myxacioid taxa are discussed, identifying those that remain in the subgenus and those that do not. A new
Myxacium
species
Cortinarius vitreopallidus
from New Zealand is described, and the genus
Quadrispora
is recombined as a section in
Cortinarius
subg.
Myxacium.