Pleuroceras pseudoplatani (von Tubeuf) Monod (syn: Ophiognomonia pseudoplatani (von Tubeuf) Barrett and Pearce, Gnomonia pseudoplatani von Tubeuf; anamorph: Asteroma pseudoplatani Butin & Wulf) is a necrotrophic parasite causing giant leaf blotch disease of sycamore maple. The pathogen was first described from sycamore (Acer pseudoplatanus L.), a species native to the mountainous areas of central Europe, by von Tubeuf (1930) as G. pseudoplatani from Germany, and