Synonyms: Brachysporium minus, Byssosphaeria phaeostroma, Chaetosphaeria phaeostroma, Cladotrichum triseptatum, Diplosporium triseptatum, Helminthosporium minus, Oedemium minus, Sphaeria phaeostroma, Sphaeria tristis, Thaxteria phaeostroma, Veramyces elagans, Veramyces elegans, Veramycina elegans.
Chaetosphaerella phaeostroma is an ascomycete fungus characterized by its dark-colored, globose to subglobose ascomata and unicellular, ellipsoid to fusoid ascospores. In East and Central Texas, it has been found growing on decaying wood and plant debris in moist environments, often associated with forests and wooded areas along streams and rivers. The fungus typically fruits in late spring and summer, producing ascomata that are 0.5-1.5 mm in diameter and contain 8-spored asci with ascospores measuring 12-18 x 4-6 µm.
Black crust fungi Hypoxylon together with Chaetosphaerella phaeostroma on a fallen branch in Big Creek Scenic Area of Sam Houston National Forest. Shepherd, Texas, October 28, 2018
Lone Star Hiking Trail, Coldspring, TX 77331, USA
Black powdery corticioid fungus Chaetosphaerella phaeostroma on a fallen tree in Big Creek Scenic Area of Sam Houston National Forest. Shepherd, Texas, February 1, 2019Lone Star Hiking Trail, Shepherd, TX 77371, USA
Black prostrate (corticioid) fungus Chaetosphaerella phaeostroma on a fallen tree in Big Creek Scenic Area of Sam Houston National Forest. Shepherd, Texas, June 26, 2019Lone Star Hiking Trail, Coldspring, TX 77331, USA
Whitewash fungus Xylodon sambuci (Hyphodontia sambuci)(?) on fallen twigs and a black corticioid fungus Chaetosphaerella phaeostroma on a fallen tree limb on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, January 12, 2020Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Hydnoid crust fungus Hymenochaetopsis olivacea (Hydnoporia olivacea) together with a black crust fungus Chaetosphaerella phaeostroma on a fallen oak branch in Brazos Bend State Park. Needville, Texas, February 15, 202040 Acre Lake Trail, Fort Bend County, Texas, United States
Hydnoid crust fungus Hymenochaetopsis olivacea (Hydnoporia olivacea) growing on a black crust fungus Chaetosphaerella phaeostroma on a fallen oak branch in Brazos Bend State Park. Needville, Texas, February 15, 202040 Acre Lake Trail, Fort Bend County, Texas, United States
Black corticioid (crust) fungus Chaetosphaerella phaeostroma on a fallen oak branch in Brazos Bend State Park. Needville, Texas, February 15, 202040 Acre Lake Trail, Fort Bend County, Texas, United States
Close-up of black corticioid (crust) fungus Chaetosphaerella phaeostroma on a fallen oak branch in Brazos Bend State Park. Needville, Texas, February 15, 202040 Acre Lake Trail, Fort Bend County, Texas, United States
Almost black corticioid (crust) fungus Chaetosphaerella phaeostroma covering a fallen oak(?) tree on Chinquapin Trail in Huntsville State Park. Texas, October 30, 2020Lone Star Trail, Huntsville, TX 77340, USA
Close-up of almost black corticioid (crust) fungus Chaetosphaerella phaeostroma on a fallen oak(?) tree on Chinquapin Trail in Huntsville State Park. Texas, October 30, 2020Lone Star Trail, Huntsville, TX 77340, USA
Almost black corticioid (crust) fungus Chaetosphaerella phaeostroma on a fallen elm tree on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, March 7, 2021Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Surface of old black crust fungus Chaetosphaerella phaeostroma on a fallen elm tree on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, March 7, 2021Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Texture of black crust fungus Chaetosphaerella phaeostroma on a fallen elm tree on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, March 7, 2021Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Black powdery corticioid fungus Chaetosphaerella phaeostroma on a fallen tree on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, June 13, 2021Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Texture of black powdery corticioid fungus Chaetosphaerella phaeostroma on a fallen tree on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, June 13, 2021Little Lake Creek Loop Trail, Montgomery, TX 77356, USAObservations of the fungus Chaetosphaerella phaeostroma were made in East and Central Texas on various substrates, including fallen branches, trees, and twigs. The fungus was found growing alone or in association with other fungi, such as Hypoxylon, Xylodon sambuci, and Hymenochaetopsis olivacea. It appeared as a black crust or powdery corticioid fungus on the surfaces of its hosts. Observations were made in different seasons, from October to June, and at various locations, including Sam Houston National Forest, Brazos Bend State Park, and Huntsville State Park. The fungus was found on different types of trees, including oak and elm. Close-up observations revealed the texture of the fungus, which appeared as a black powdery or crust-like growth on the surface of its hosts.
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