This taxon name is not current. The available references for this name are:
Cystangium Singer & A.H.Sm. is more recently known as Russula Pers.
Reason See T. Lebel in Muelleria 36:9 (2017)
See also: A longer explanation of these and other terms in our Plant Names Primer.
A taxon name that is no longer current will retain its ‘Threatened’, ‘Extinct’, or ‘Extinct in the Wild’ status until a new name has been published in a Biodiversity Conservation Order.