Extract from Wikipedia article: Puccinia oxalidis is a fungus species in the genus Puccinia. This species is a causal agent of rust on plants in the genus Oxalis, such as Oxalis articulata. The disease appears as yellow dots on the reverse of the leaves. The aecial stage can be found on Berberis repens.
Common yellow oxalis (Oxalis stricta) with sorrel rust fungus (Puccinia oxalidis) in wet area on Raccoon Run Trail in Lick Creek Park. College Station, Texas, March 22, 2019 Raccoon Run, College Station, TX 77845, USA
Leaves of yellow oxalis (Oxalis stricta) with sorrel rust fungus (Puccinia oxalidis) in wet area on Raccoon Run Trail in Lick Creek Park. College Station, Texas, March 26, 2019 Raccoon Run, College Station, TX 77845, USA
Common yellow oxalis (Oxalis stricta) with sorrel rust fungus (Puccinia oxalidis) in wet area on Raccoon Run Trail in Lick Creek Park. College Station, Texas, March 26, 2019 Raccoon Run, College Station, TX 77845, USA
Sorrel rust fungus (Puccinia oxalidis) on yellow oxalis (Oxalis stricta) in wet area on Raccoon Run Trail in Lick Creek Park. College Station, Texas, March 26, 2019 Raccoon Run, College Station, TX 77845, USA
Sorrel rust fungus (Puccinia oxalidis) on yellow oxalis (Oxalis stricta) in Bee Creek Park. College Station, Texas, March 29, 2022 2629, Longmire Drive, College Station, Brazos County, Texas, 77845, United States
Underside of leaves of wood sorrel Oxalis stricta with rust fungus Puccinia oxalidis in Bee Creek Park. College Station, Texas, March 29, 2022 2629, Longmire Drive, College Station, Brazos County, Texas, 77845, United States
Spores of sorrel rust fungus (Puccinia oxalidis) at low magnofication, collected in Bee Creek Park. College Station, Texas, March 29, 2022
Urediniospores of sorrel rust fungus (Puccinia oxalidis), collected in Bee Creek Park. College Station, Texas, March 29, 2022