Synchytrium geranii is a species of fungus in the phylum Chytridiomycota that infects plants in the family Geraniaceae. In East and Central Texas, it has been found to parasitize wild geranium (Geranium carolinianum) and other related species, causing disease characterized by gall-like structures on the leaves and stems of infected plants. The fungus produces zoospores that infect plant cells, leading to the formation of sorus-containing galls.
Wart disease (false rust) caused by fungus Synchytrium geranii (Chytrids) on crane's bill (Geranium carolinianum) near the creek in Bee Creek Park. College Station, Texas, March 23, 2021
1900 Anderson St, College Station, TX 77840, USA
Plant of crane's bill (Geranium carolinianum) with wart disease (false rust) caused by fungus Synchytrium geranii (Chytrids) taken from Bee Creek Park. College Station, Texas, March 23, 2021
Close-up of wart disease (false rust) caused by fungus Synchytrium geranii (Chytrids) on crane's bill (Geranium carolinianum) taken from Bee Creek Park. College Station, Texas, March 23, 2021
Gall on roots of crane's bill (Geranium carolinianum) caused by fungus Synchytrium geranii (Chytrids) taken from Bee Creek Park. College Station, Texas, March 23, 2021
Malformed basal leaves of crane's bill (Geranium carolinianum) with wart disease (false rust) caused by fungus Synchytrium geranii (Chytrids) taken from Bee Creek Park. College Station, Texas, March 23, 2021
Leaves of crane's bill (Geranium carolinianum) with red galls caused by wart disease (false rust) by fungus Synchytrium geranii (Chytrids) taken from Bee Creek Park. College Station, Texas, March 23, 2021
Leaf of crane's bill (Geranium carolinianum) with a wart caused by fungus Synchytrium geranii on a lawn in Hensel Park. College Station, Texas, March 25, 2021Hensel Park, College Ave, College Station, TX 77840, USA
Wart disease (false rust) caused by fungus Synchytrium geranii (Chytrids) on crane's bill (Geranium carolinianum) in David E. Schob Nature Preserve at 906 Ashburn Street. College Station, Texas, March 27, 2021Schob Nature Preserve, 906 Ashburn Ave, College Station, TX 77840, USA
Close-up of warts caused by fungus Synchytrium geranii (Chytrids) on crane's bill (Geranium carolinianum) in David E. Schob Nature Preserve at 906 Ashburn Street. College Station, Texas, March 27, 2021Schob Nature Preserve, 906 Ashburn Ave, College Station, TX 77840, USA
Wart disease caused by fungus Synchytrium geranii (Chytrids) on leaves of crane's bill (Geranium carolinianum) in David E. Schob Nature Preserve at 906 Ashburn Street. College Station, Texas, March 27, 2021Schob Nature Preserve, 906 Ashburn Ave, College Station, TX 77840, USA
Malformed leaves of crane's bill (Geranium carolinianum) with fungus Synchytrium geranii (Chytrids) in David E. Schob Nature Preserve at 906 Ashburn Street. College Station, Texas, March 27, 2021Schob Nature Preserve, 906 Ashburn Ave, College Station, TX 77840, USA
Red warts on leaves of crane's bill (Geranium carolinianum) with fungus Synchytrium geranii (Chytrids) in David E. Schob Nature Preserve at 906 Ashburn Street. College Station, Texas, March 27, 2021Schob Nature Preserve, 906 Ashburn Ave, College Station, TX 77840, USA
Leaves of crane's bill (Geranium carolinianum) with fungus Synchytrium geranii (Chytrids) in David E. Schob Nature Preserve at 906 Ashburn Street. College Station, Texas, March 27, 2021Schob Nature Preserve, 906 Ashburn Ave, College Station, TX 77840, USA
Leaves of crane's bill (Geranium carolinianum) with fungus Synchytrium geranii on black background in David E. Schob Nature Preserve at 906 Ashburn Street. College Station, Texas, March 27, 2021
Crane's bill (Geranium carolinianum) with fungus Synchytrium geranii on dark background in David E. Schob Nature Preserve at 906 Ashburn Street. College Station, Texas, March 27, 2021
Wart disease (false rust) caused by fungus Synchytrium geranii (Chytrids) on crane's bill (Geranium carolinianum) in Lick Creek Park. College Station, Texas, March 30, 2022Post Oak Trail, College Station, Brazos County, Texas, United States
Fungus Synchytrium geranii (Chytrids) from crane's bill under a microscope collected in Lick Creek Park. College Station, Texas, March 30, 2022
Wart disease (false rust) caused by fungus Synchytrium geranii (Chytrids) on crane's bill (Geranium carolinianum) on a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 5, 2023Burleson County, Texas, United StatesObservations of the fungus Synchytrium geranii in East and Central Texas reveal its presence on crane's bill (Geranium carolinianum) plants. The fungus causes wart disease, also known as false rust, which results in the formation of warts or galls on the leaves and roots of infected plants. Infected leaves often become malformed and may display red galls. The fungus was observed in various locations, including Bee Creek Park, Hensel Park, David E. Schob Nature Preserve, Lick Creek Park, and Somerville Lake State Park. Microscopic examination of infected plant material confirmed the presence of Synchytrium geranii. The observations were made over a period of two years, from March 2021 to March 2023, indicating the persistence of the fungus in the region. The disease was found to affect both the leaves and roots of crane's bill plants.
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