Abstract: Phallogaster saccatus is reported, described and illustrated from East Asia for the first time. It is characterized by its sac-like, single-layered peridium with irregularly shaped thin depressed areas which becomes perforated, the columella that deliquesces and entirely disappears by maturity, the olivaceous spore mass (adhering to the inner surface of the otherwise hollow basidioma) that breaks irregularly when mature, the absence of a volva and the bacilliform to cylindric, smooth basidiospores with a nearly truncate base and a short sterigmal appendage. The genus Phallogaster is currently viewed as monotypic.

Key words: Phallogastraceae