Psathyrella ammophila is a psammophilous fungus most frequently inhabiting
seashore beaches, sand dunes and sandy inland areas. Although it is a widely
spread species, in some countries it is rare or threatened, including Poland,
where it is classifed as “endangered” (E). In Poland, P. ammophila has been
found in 26 localities, including 14 new reports afer 1970. We present two
new Polish localities from white sand dunes at the western shore of the Baltic
Sea (Wolin Island). Moreover, ecological information and macroscopic and
microscopic features of the basidiocarp based on collected samples are presented.
Te problem of the disappearance of dunes as a primary habitat of P. ammophila
is also discussed.