Synonyms: Hypoxylon annulatum, Hypoxylon circumscribum, Hypoxylon marginatum, Hypoxylon vernicosum, Sphaeria annulata, Sphaeria marginata.
Annulohypoxylon annulatum is a species of fungus in the family Xylariaceae, characterized by its effused to pulvinate stromata with yellow to orange granules on the surface and perithecia that are partially to completely immersed. In East and Central Texas, it is commonly found on dead branches and trunks of deciduous trees, particularly oak and elm. The fungus produces ascospores that are dark brown, unicellular, and cylindrical to ellipsoidal in shape. It typically fruits in the spring and summer months, with stromata reaching 1-5 cm in diameter.
Annulohypoxylon annulatum mushroom on on a fallen twig of an oak(?) on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, August 31, 2019
Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Black fungus Annulohypoxylon annulatum on on a fallen twig on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, August 31, 2019Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Black crust fungus Annulohypoxylon annulatum(?) on a log in Big Creek Scenic Area of Sam Houston National Forest. Shepherd, Texas, November 21, 2021Lone Star Hiking Trail, San Jacinto County, Texas, United States
Black mushroom Annulohypoxylon annulatum(?) on an oak log on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, October 30, 2022Little Lake Creek Loop Trail, Montgomery County, Texas, 77873, United States
Close-up of black mushroom Annulohypoxylon annulatum(?) on an oak log on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, October 30, 2022Little Lake Creek Loop Trail, Montgomery County, Texas, 77873, United States
Spores of black mushroom Annulohypoxylon annulatum(?) from an oak log, collected a day before on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, October 31, 2022Observations of Annulohypoxylon annulatum in East and Central Texas reveal that the fungus grows on fallen twigs and logs, particularly those of oak trees. It has been spotted in Sam Houston National Forest, specifically on Caney Creek Trail and Big Creek Scenic Area. The fungus appears as a black crust or mushroom, with sightings recorded in August, November, and October. Close-up observations and spore collection have provided further insight into the fungus's characteristics. Multiple sightings on the same trail, Caney Creek Trail, suggest that the fungus may be common in this area. The consistent association with oak logs and twigs implies a possible preference for this substrate. Overall, these observations provide valuable information about the habitat and distribution of Annulohypoxylon annulatum in East and Central Texas.
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