The conidial stage of powdery mildew on oaks in Slovakia was studied. Two previously reported species, Microsphaera alphitoides and M. hypophylla, were found to be taxonomically indistinguishable. The oak powdery mildew is regarded as a single species, M. alphitoides, exhibiting great variability in conidial characteristics.
Záhorovská E. (1986): Parasitärer Pilz Microsphaera und sein Konidienstadium an den Eichen der Slowakei. I. – Česká Mykologie 40(1): 30–37.