Aecia ... in small and crowded groups 1-3 mm. across, on a hemispherical, hypertrophied substratum, cupulate, small, 0.1-0.2 mm. in diameter.
Host ... Jussiaea californica [Ludwigia peploides ssp. peploides per Jepson].
”- Arthur, Joseph Charles: (1920) New Species of Uredineae--XII©
Reference: www.biodiversitylibrary.org/item/45687#page/497/mode/1up