West side of San Pablo Reservoir, just SE of the boat launch area.
Longitude (DD)
-122.23194
Latitude (DD)
37.916047
Elevation (m)
90
Habitat
Largely open edges in draw-down area around reservoir. Euphorbia was abudant, and Artemisia biennis, Glinus, etc.
Description
Locally common on Euphorbia serpyllifolia. The Euphorbia was locally abundant. This collection is of the plants that had a similar morphology to the uninfected ones (aside from the conspicuous dark lesions).
Collection notes
Photos taken and posted to iNaturalist. Another specimen was collected here (CJR5454), which was more rust-like, and infected plants were tall and scraggly.