FIGURE 3. Microphotographs of fruiting bodies of Podosphaera filipendulensis (AMH 9934, holotype) a. Initial stage of developing cleistothecium (homogenious cells). b. Mature cleistothecium. c. Pseudoparenchymatous nature of wall of cleistothecium. d–g. Ruptured cleistothecia each releasing an ascus. h, i. Appendages on the surface of cleistothecia. Scale bars: a = 25 μm, b = 40 μm, c = 20 μm, d = 50 μm, e = 40 μm, f, g = 30 μm, h, i = 20 μm.