Synonyms: Biscogniauxia pezizoides, Hypoxylon repandum, Nummularia pezizoides, Nummularia repanda, Nummularia repandoides, Nummulariella repanda, Numulariola repanda, Patellaria repanda, Poronia repanda, Sphaeria repanda.
Biscogniauxia repanda is a saprotrophic fungus that grows on dead wood, particularly oak and other hardwoods. In East and Central Texas, it is commonly found on fallen branches and logs, often in wooded areas with rich soil and high humidity. The fungus produces stromata that are initially white to light brown, becoming darker brown to black with age, and are typically 1-5 cm long and 0.5-2 cm wide. Ascospores are dark brown, ellipsoid, and measure 12-18 μm in length. Biscogniauxia repanda is a relatively common species in the region, fruiting throughout the year, but most abundantly from spring to fall.
Black crust fungus Biscogniauxia repanda on a fallen tree branch in Lick Creek Park. College Station, Texas, February 13, 2020
1405 Bulle Rock Ct, College Station, TX 77845, USA
Black crust fungus Biscogniauxia repanda on a fallen limb in Lick Creek Park. College Station, Texas, February 13, 20201405 Bulle Rock Ct, College Station, TX 77845, USA
Close-up of black crust fungus Biscogniauxia repanda on a fallen tree branch in Lick Creek Park. College Station, Texas, February 13, 20201405 Bulle Rock Ct, College Station, TX 77845, USA
Black crust fungus Biscogniauxia repanda on a dry Yaupon holly(?) in Lick Creek Park. College Station, Texas, February 13, 20201405 Bulle Rock Ct, College Station, TX 77845, USA
Fungus Biscogniauxia repanda on a fallen honey locust (Gleditsia triacanthos) in wet area in Lick Creek Park. College Station, Texas, February 20, 2024Iron Bridge Trail, College Station, Brazos County, Texas, United States
Black fungus Biscogniauxia repanda (Sordariomycetes) on a fallen honey locust (Gleditsia triacanthos) in wet area in Lick Creek Park. College Station, Texas, February 20, 2024Iron Bridge Trail, College Station, Brazos County, Texas, United States
Close-up of black fungus Biscogniauxia repanda (Sordariomycetes) on a fallen honey locust (Gleditsia triacanthos) in wet area in Lick Creek Park. College Station, Texas, February 20, 2024Iron Bridge Trail, College Station, Brazos County, Texas, United States
Close-up of black fungus Biscogniauxia repanda (Sordariomycetes) on bark of a fallen honey locust (Gleditsia triacanthos) in wet area in Lick Creek Park. College Station, Texas, February 20, 2024Iron Bridge Trail, College Station, Brazos County, Texas, United States
Texture of black fungus Biscogniauxia repanda (Sordariomycetes) on a fallen honey locust (Gleditsia triacanthos) in wet area in Lick Creek Park. College Station, Texas, February 20, 2024Iron Bridge Trail, College Station, Brazos County, Texas, United States
Tissue (in KOH) of black fungus Biscogniauxia repanda (Sordariomycetes) from a fallen honey locust, collected in Lick Creek Park. College Station, Texas, February 20, 2024
Spores of black fungus Biscogniauxia repanda (Sordariomycetes) from a fallen honey locust, collected 2 days before in Lick Creek Park. College Station, Texas, February 22, 2024Observations of the fungus Biscogniauxia repanda in East and Central Texas reveal its presence on various substrates, including fallen tree branches, limbs, and dry Yaupon holly. The fungus was found in Lick Creek Park, College Station, Texas, on multiple occasions between February 13, 2020, and February 22, 2024. It was observed growing on different tree species, such as honey locust (Gleditsia triacanthos), often in wet areas. Close-up examinations revealed the fungus's black crust-like appearance, with a notable texture. Microscopic analysis of tissue samples and spores confirmed the identity of Biscogniauxia repanda, belonging to the Sordariomycetes class. The observations suggest that this fungus is common in the region, thriving on decaying wood in various environments.
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