Septobasidium fumigatum is a species of fungus that belongs to the family Septobasidiaceae. It is a heterobasidiomycete that forms symbiotic relationships with scale insects, particularly the black pecan aphid, and is commonly found on trees in the southeastern United States. In East and Central Texas, S. fumigatum has been reported to infect pecan and other tree species, including oak and hickory, often forming conspicuous, velvety, brown to black colonies on the bark and branches. The fungus can cause significant damage to its host trees, particularly pecan, by inducing the formation of galls and reducing nut production.
Observations of the fungus Septobasidium fumigatum in East and Central Texas reveal a black and grey corticioid fungus growing on the smooth bark of living elm trees. The texture of the fungus is notable, with a crust-like appearance. Close-up observations show the intricate details of the fungus, including its coloration and pattern. In some cases, the fungus has a white fringe, adding to its distinctive appearance. These observations were made in the Winters Bayou area of Sam Houston National Forest, east of Waverly, Texas, on December 5, 2020. The fungus was found to be thriving on the bark of elm trees, suggesting a symbiotic relationship between the fungus and its host tree. Further study is needed to fully understand the characteristics and behavior of Septobasidium fumigatum in this region.
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