A fruit body of Agaricus arvensis Schaeff. ex Fr. was found with deformed lamellae and complete sterility. The deformity was likely caused by the bacterium Bacillus cereus Frankland et Frankland. A dry specimen is preserved at the National Museum in Prague (PR 714357).
Pilát A., Svrčková J. (1972): Deformatio et sterilitas carposomatis Agarici arvensis Schaeff. ex Fr. bacterio effectae. – Česká Mykologie 26(4): 226–227.