A collection of Agaricus campester L.: Fr. s.l., made on a little sand dune shows a number of misformed spores which are shortly analyzed as to their dimensions and forms. The weather of the days preceeding the collection have been sufficiently dry and warm to be hypothetically responsible of the misformation of the spores.
Heinemann P. (1996): Un cas de malformation sporale chez un Agaricus. – Czech Mycology 48(4): 251–255.
