Podosphaera clandestina is a species of powdery mildew in the family Erysiphaceae. It is found across the world, where it affects plants in the genera Crataegus, Cydonia and Mespilus.
Description
The fungus forms a thin coating on host leaves, typically on young shoots and new branches. Podosphaeraclandestina, like most Erysiphaceae, is fairly host-specific and infects only a few genera. == Taxonomy ==
Taxonomy
The fungus was formally described in 1819 by Wallroth with the basionymAlphitomorpha clandestina. The species was transferred to the genus Podosphaera by Léveillé in 1851. Podosphaera clandestina is likely a species complex, and comprises multiple varieties with differing host or geographic ranges and slight microscopic differences. var. clandestina is native to Eurasia and found on various Crataegus species; var. cydoniae is found on Cydonia; var. luxurians is found on Crataegus in western North American mountains (Colorado); and var. perlonga is found in the American Midwest (Indiana) on the same host genus. Their macromorphology and full geographic ranges are still not yet well known. == References ==