Ascobolus carbonarius is a species of cup fungus in the family Ascobolaceae. It is typically found growing on dung, particularly that of herbivores, in grasslands and pastures. In East and Central Texas, it fruits during the spring and summer months, often in association with the dung of cattle and other livestock. The fungus produces small, cup-shaped apothecia that are 0.5-2 cm in diameter, with a dull brown to black exterior and a smooth, yellowish to orange interior. Ascobolus carbonarius is considered a common species in the region, and its presence can be an indicator of grazing activity and nutrient cycling in ecosystems.
Orange cups of fire fungus Anthracobia melaloma together with dark-brown cup fungus Ascobolus carbonarius on a site of a recent burn in Bastrop State Park. Bastrop, Texas, February 23, 2020 Park Rd 1-A, Bastrop, TX 78602, USA
Dark-brown cup fungus Ascobolus carbonarius and orange cups of fire fungus Anthracobia melaloma on a site of a recent burn in Bastrop State Park. Bastrop, Texas, February 23, 2020 Park Rd 1-A, Bastrop, TX 78602, USA
Cup fungus Ascobolus carbonarius on a site of a recent burn in Bastrop State Park. Bastrop, Texas, February 23, 2020 Park Rd 1-A, Bastrop, TX 78602, USA
Dark-brown cup fungus Ascobolus carbonarius and orange cups of fire fungus Anthracobia melaloma together with green algae on a site of a recent burn in Bastrop State Park. Bastrop, Texas, February 23, 2020 Park Rd 1-A, Bastrop, TX 78602, USA
Cup fungus Ascobolus carbonarius on a bonfire site on a utility line cutting on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, March 23, 2020 Lone Star Hiking Trail, Montgomery, TX 77356, USA
Ascomycete fungus Ascobolus carbonarius on a bonfire site on a utility line cutting on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, March 23, 2020 Lone Star Hiking Trail, Montgomery, TX 77356, USA
Brown cups of fungus Ascobolus carbonarius on a bonfire site on a utility line cutting on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, March 23, 2020 Lone Star Hiking Trail, Montgomery, TX 77356, USA
Details of cup fungus Ascobolus carbonarius on a bonfire site on a utility line cutting on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, March 23, 2020 Lone Star Hiking Trail, Montgomery, TX 77356, USA
Close-up of cup fungus Ascobolus carbonarius on a bonfire site on a utility line cutting on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, March 23, 2020 Lone Star Hiking Trail, Montgomery, TX 77356, USA
Cup fungus Ascobolus carbonarius on a burnt ground on a utility line cutting on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, March 23, 2020 Lone Star Hiking Trail, Montgomery, TX 77356, USA
Brown cups of Ascomycete fungus Ascobolus carbonarius on a bonfire site on a utility line cutting on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, March 23, 2020 Lone Star Hiking Trail, Montgomery, TX 77356, USA
Broken cup of Ascomycete fungus Ascobolus carbonarius on a bonfire site on a utility line cutting on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, March 23, 2020 Lone Star Hiking Trail, Montgomery, TX 77356, USA
Ascomycete mushrooms Ascobolus carbonarius on a campsite bonfire on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, September 19, 2020 Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Fungus Ascobolus carbonarius on a campsite bonfire on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, September 19, 2020 Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Fungus Ascobolus carbonarius on bonfire ashes on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, September 19, 2020 Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Ascomycete mushrooms Ascobolus carbonarius on a burnt ground on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, September 19, 2020 Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Ascomycete mushrooms Ascobolus carbonarius on a bonfire site on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, September 19, 2020 Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Close-up of Ascomycete mushrooms Ascobolus carbonarius on a bonfire site on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, September 19, 2020 Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Masses of Ascomycete mushrooms Ascobolus carbonarius on a bonfire site on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, September 19, 2020 Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Cup fungus Ascobolus carbonarius on a bonfire site on a hiker's campground on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, September 26, 2020 Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Close-up of cup fungus Ascobolus carbonarius on a bonfire site on a hiker's campground on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, September 26, 2020 Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Ascomycete mushrooms Ascobolus carbonarius on a campsite bonfire on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, September 26, 2020 Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Fungus Ascobolus carbonarius on bonfire ashes on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, September 26, 2020 Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Small mushroom Tephrocybe anthracophila (Lyophyllum anthracophilum) and cup fungus Ascobolus carbonarius(?) on a bonfire site on Stubblefield section of Lone Star hiking trail north from Trailhead No. 6 in Sam Houston National Forest. Texas, April 17, 2021 Lone Star Hiking Trail, Montgomery, TX 77356, USA
Ascomycete mushrooms Anthracobia maurilabra together with Ascobolus carbonarius(?) on a bonfire site on Richards Loop Trail in Sam Houston National Forest. Texas, December 9, 2021 Little Lake Creek Loop Trail, Montgomery County, Texas, 77873, United States
AI-generated summary of observations
The fungus Ascobolus carbonarius was observed in East and Central Texas, primarily in areas with recent burns or bonfires. Observations were made in Bastrop State Park and Sam Houston National Forest, particularly on trails such as Caney Creek and Lone Star Hiking Trail. The fungus was found growing on burnt ground, bonfire ashes, and campsite fires between February and December 2020, and again in April and December 2021. It often co-occurred with other fungi, including Anthracobia melaloma and Tephrocybe anthracophila. The observations suggest that Ascobolus carbonarius is a fire-associated species that thrives in areas with recent burns or fires. Multiple sightings were recorded over several months, indicating its persistence in these environments. Overall, the observations provide insight into the habitat preferences and distribution of this fungus in East and Central Texas.