Synonym: Exobasidium symploci.
Exobasidium symploci-japonicae is a fungus that infects Sweetleaf plants (Symplocos tinctoria), causing gall-like structures to form on the leaves and stems. In East and Central Texas, it has been found to be relatively common, with reports of infection in several counties, including Brazos, Burleson, and Grimes. The fungus produces white, powdery conidia on the surface of the galls, which can be seen from late spring to early fall. Infected plants often have distorted or stunted growth, and may exhibit premature defoliation.
Galls caused by fungus Exobasidium symploci-japonicae on sweetleaf (Symplocos tinctoria) (?) on Sundew Trail in Big Thicket National Preserve. Kountze, Texas, August 2, 2014
228 Co Rd 1910, Warren, TX 77664, USA
Galls caused by the fungus Exobasidium symploci-japonicae on sweetleaf (Symplocos tinctoria) in Big Creek Scenic Area of Sam Houston National Forest. Shepherd, Texas, March 10, 2019Lone Star Hiking Trail, Coldspring, TX 77331, USA
Flowers of sweetleaf (Symplocos tinctoria) with galls caused by the fungus Exobasidium symploci-japonicae in Big Creek Scenic Area of Sam Houston National Forest. Shepherd, Texas, March 10, 2019Lone Star Hiking Trail, Coldspring, TX 77331, USA
Galls caused by the fungus Exobasidium symploci-japonicae on a tree of sweetleaf (Symplocos tinctoria) in Big Creek Scenic Area of Sam Houston National Forest. Shepherd, Texas, March 10, 2019Lone Star Hiking Trail, Coldspring, TX 77331, USA
Galls caused by the fungus Exobasidium symploci-japonicae on sweetleaf (Symplocos tinctoria) in Big Creek Scenic Area of Sam Houston National Forest. Shepherd, Texas, March 20, 2021Lone Star Hiking Trail, Coldspring, TX 77331, USA
Close-up of a gall caused by the fungus Exobasidium symploci-japonicae in Big Creek Scenic Area of Sam Houston National Forest. Shepherd, Texas, March 20, 2021Lone Star Hiking Trail, Coldspring, TX 77331, USA
Gall caused by the fungus Exobasidium symploci-japonicae on a young shoot of sweetleaf in Big Creek Scenic Area of Sam Houston National Forest. Shepherd, Texas, March 20, 2021Lone Star Hiking Trail, Coldspring, TX 77331, USA
Galls caused by fungus Exobasidium symploci-japonicae on sweetleaf on Winters Bayou Trail in Sam Houston National Forest. Cleveland, Texas, September 24, 2022Lone Star Hiking Trail, San Jacinto County, Texas, 77328, United States
Sweetleaf (Symplocos tinctoria) with galls caused by fungus Exobasidium symploci-japonicae on Winters Bayou Trail in Sam Houston National Forest. Cleveland, Texas, September 24, 2022Lone Star Hiking Trail, San Jacinto County, Texas, 77328, United States
Galls caused by fungus Exobasidium symploci-japonicae on sweetleaf under a microscope (in KOH, x40 objective), collected on Winters Bayou Trail in Sam Houston National Forest. Cleveland, Texas, September 24, 2022Observations of the fungus Exobasidium symploci-japonicae were made in East and Central Texas, specifically in Big Thicket National Preserve and Sam Houston National Forest. Galls caused by the fungus were found on sweetleaf (Symplocos tinctoria) at various locations, including Sundew Trail, Big Creek Scenic Area, and Winters Bayou Trail. The galls were observed on different parts of the plant, such as leaves, flowers, and young shoots. Close-up examinations of the galls were made using a microscope, revealing detailed structures. The observations were recorded over several years, from 2014 to 2022, in different months, including August, March, and September. The fungus was consistently found to cause galls on sweetleaf in these regions, suggesting a widespread presence of Exobasidium symploci-japonicae in East and Central Texas.
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