Synonyms: Caeoma olivaceum, Elateromyces olivaceus, Erysibe olivacea, Farysia caricis, Farysia jaapii, Farysia olivacea, Farysia subolivacea, Stilbella olivacea, Uredo olivacea, Uredo segetum, Ustilago caricicola, Ustilago olivacea, Ustilago subolivacea, Ustilago thuemenii.
Common name: sedge flower smut fungus.
Farysia thuemenii is a smut fungus that infects grasses, particularly species of Stipa and Andropogon. In East and Central Texas, it has been found on little bluestem (Schizachyrium scoparium) and big bluestem (Andropogon gerardii), causing systemic infections that result in the replacement of host flowers with spore-filled sori. The fungus is typically found in prairies, savannas, and open woods, where it can be abundant on infected grasses during the summer and fall months.
Southern long sedge (Carex lonchocarpa) with sedge flower smut fungus (Farysia thuemenii) in wet area of baygall forest on D. L. property. Bleakwood, Newton County, Texas, June 11, 2022
Newton County, Texas, United States
Spores of sedge flower smut fungus (Farysia thuemenii) from southern long sedge (Carex lonchocarpa) collected a day before in Bleakwood, Newton County, Texas, June 12, 2022
Spores of sedge flower smut fungus (Farysia thuemenii) in KOH solution collected two days before in Bleakwood, Newton County. Texas, June 13, 2022
Spores of sedge flower smut fungus (Farysia thuemenii) from southern long sedge (Carex lonchocarpa) collected two days before in Bleakwood, Newton County. Texas, June 13, 2022
Spores of sedge flower smut fungus (Farysia thuemenii) in iodine solution collected two days before in Bleakwood, Newton County. Texas, June 13, 2022Observations of Farysia thuemenii in East and Central Texas reveal its presence on southern long sedge (Carex lonchocarpa) in wet areas of baygall forests. The fungus was found in Bleakwood, Newton County, with spores collected from infected sedges on June 11-13, 2022. Spore samples were examined in various solutions, including KOH and iodine, to study their characteristics. The observations suggest that Farysia thuemenii is active in the region during early summer, infecting southern long sedge in moist environments. The fungus's spores were successfully collected and analyzed, providing insight into its morphology and behavior in East and Central Texas. These findings contribute to a better understanding of the distribution and ecology of Farysia thuemenii in the region. Further study is needed to fully understand the impact of this fungus on local ecosystems.
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