Copyright Chris Moody
GPS coords for park only as species were collected all over the park during a bioblitz and brought back to the same location to be identified.
This leaf blight appears to be genus Entomosporium, which commonly afflicts Toyon and other members of the rose family. The subject toyon shrub that is afflicted has about ten percent of its leaves afflicted with this blight. The genus Entomosporium is actually classified within Incertae sedis of the order Helotiales. Two of the most common California species that could be candidates for this ID are E. mespili and E. maculatum.
This rust or yellow fungus was seen afflicting some of the leaves of this Quercus douglasii.
Growing in a seep.