Hyperparasitic fungi on plant-associated microfungi. a. Zoospores (black arrow) and zoosporangium (white arrow) of Olpidium uredinis inside a urediniospore of a rust fungus (Pucciniales). b. Picnidia of Ampelomyces quisqualis. c. Fusarium sp. on aecidia of Puccinia coronata on a leaf of Rhamnus cathartica. d. Trichothyrium sp. on a colony of Meliola sp. e. White hyphomycete on pycnidia of Camarotella costaricensis (Sordariomycetes: Phyllachorales) on a leaf of Acrocomia aculeata. f. Paranectriella sp. on a colony of Meliola sp.