Reference
Uwe Braun, Nina Shishkoff, Susumu Takamatsu (2001): Phylogeny of Podosphaera sect. Sphaerotheca subsect. Magnicellulatae (Sphaerotheca fuliginea auct. s.lat.) inferred from rDNA ITS sequences - a taxonomic interpretation – Schlechtendalia – 7: 45 - 52.