This taxon name is not current. The available references for this name are:
Hypneaceae J.Agardh is more recently known as Cystocloniaceae Kütz.
Reason: See G.W. Saunders et al. in Canad.J.Bot. 82:46 (2004)
See also: A longer explanation of these and other terms in our Plant Names Primer.
A taxon name which is no longer current will retain its ‘Threatened’ status until publication of the next Threatened Flora - Rare Flora Notice.